FPUS55 KBOU 181849 ZFPBOU Zone Forecast Product for Northeast Colorado National Weather Service Denver/Boulder CO 1248 PM MDT Mon May 18 2026 COZ039-040-190900- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Including Arvada, Boulder, Golden, Lakewood, Longmont, Aurora, Brighton, City of Denver, Denver International Airport, Highlands Ranch, Littleton, and Parker 1248 PM MDT Mon May 18 2026 .REST OF TODAY...Rain showers. Chance of thunderstorms early in the afternoon, then a slight chance of thunderstorms and snow showers late in the afternoon. No snow accumulation. Highs in the lower to mid 40s. North winds 10 to 15 mph with gusts up to 25 mph. .TONIGHT...Rain showers likely and chance of snow showers. Patchy fog after midnight. No snow accumulation. Lows in the lower to mid 30s. North winds 10 to 15 mph with gusts up to 20 mph in the evening, becoming light. Chance of precipitation 60 percent. .TUESDAY...Mostly cloudy. Patchy fog in the morning. Chance of rain showers and slight chance of thunderstorms in the afternoon. Highs near 50. Chance of rain 50 percent. .TUESDAY NIGHT...Showers likely in the evening, then a chance of showers after midnight. Lows in the upper 30s. Chance of rain 70 percent. .WEDNESDAY...Rain showers likely and chance of thunderstorms. Highs in the mid 50s to lower 60s. Chance of rain 70 percent. .WEDNESDAY NIGHT...Mostly cloudy with a chance of showers and slight chance of thunderstorms. Lows around 40. Chance of rain 50 percent. .THURSDAY...Showers likely and chance of thunderstorms. Highs in the mid to upper 60s. Chance of rain 70 percent. .THURSDAY NIGHT...Showers likely and chance of thunderstorms. Lows in the lower 40s. Chance of rain 60 percent. .FRIDAY...Mostly cloudy with a 30 percent chance of thunderstorms. Highs in the mid 60s. .FRIDAY NIGHT...Partly cloudy with a 20 percent chance of thunderstorms. Lows in the lower 40s. .SATURDAY...Partly cloudy with a 30 percent chance of thunderstorms. Highs in the lower 70s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 40s. Highs near 80. .SUNDAY NIGHT...Partly cloudy. Lows near 50. .MEMORIAL DAY...Mostly sunny with a 10 percent chance of thunderstorms. Highs in the lower to mid 80s. $$ COZ038-190900- Larimer County Below 6000 Feet/Northwest Weld County- Including Fort Collins, Hereford, Loveland, and Nunn 1248 PM MDT Mon May 18 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... .REST OF TODAY...Slight chance of thunderstorms. Rain and snow showers early in the afternoon, then rain showers likely and slight chance of snow showers late in the afternoon. No snow accumulation. Highs 37 to 43. Northeast winds 10 to 20 mph with gusts up to 30 mph. .TONIGHT...Mostly cloudy. Chance of rain showers in the evening. Slight chance of snow showers through the night. Lows 26 to 32. North winds 10 to 15 mph with gusts up to 30 mph in the evening, becoming light. Chance of precipitation 30 percent. .TUESDAY...Mostly cloudy. Slight chance of thunderstorms in the afternoon. Highs 48 to 54. Chance of precipitation 10 percent. .TUESDAY NIGHT...Mostly cloudy with a 40 percent chance of rain showers. Lows in the mid to upper 30s. .WEDNESDAY...Mostly cloudy with a 50 percent chance of thunderstorms. Highs in the mid 50s to lower 60s. .WEDNESDAY NIGHT...Mostly cloudy with a chance of showers and slight chance of thunderstorms. Lows in the mid 30s to lower 40s. Chance of rain 30 percent. .THURSDAY...Showers likely and chance of thunderstorms. Highs in the lower to mid 60s. Chance of rain 60 percent. .THURSDAY NIGHT...Showers likely and chance of thunderstorms. Lows near 40. Chance of rain 70 percent. .FRIDAY...Mostly cloudy with a 30 percent chance of thunderstorms. Highs in the 60s. .FRIDAY NIGHT...Partly cloudy with a 10 percent chance of showers. Lows near 40. .SATURDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs in the lower to mid 70s. .SATURDAY NIGHT...Partly cloudy. Lows in the lower to mid 40s. .SUNDAY...Mostly sunny. Highs near 80. .SUNDAY NIGHT...Partly cloudy. Lows in the mid 40s to lower 50s. .MEMORIAL DAY...Mostly sunny. Highs in the lower to mid 80s. $$ COZ041-190900- Elbert/Central and East Douglas Counties Above 6000 Feet- Including Castle Rock, Elbert, Fondis, Kiowa, and Larkspur 1248 PM MDT Mon May 18 2026 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... .REST OF TODAY...Rain showers. Chance of thunderstorms early in the afternoon, then snow showers and slight chance of thunderstorms late in the afternoon. No snow accumulation. Highs 42 to 48. North winds 10 to 20 mph with gusts up to 30 mph. .TONIGHT...Cloudy. Patchy fog through the night. Chance of rain showers in the evening. Chance of snow showers through the night. Lows near 30. North winds 10 to 20 mph with gusts up to 30 mph. Chance of precipitation 40 percent. .TUESDAY...Mostly cloudy. Patchy fog in the morning. Chance of rain showers and slight chance of thunderstorms in the afternoon. Highs near 50. East winds 10 to 15 mph with gusts up to 20 mph in the afternoon. Chance of rain 30 percent. .TUESDAY NIGHT...Rain showers likely. Slight chance of snow showers after midnight. No snow accumulation. Lows in the 30s. Southeast winds 10 to 15 mph with gusts up to 25 mph after midnight. Chance of precipitation 70 percent. .WEDNESDAY AND WEDNESDAY NIGHT...Rain showers and chance of thunderstorms. Highs in the mid to upper 50s. Lows in the mid 30s to lower 40s. South winds 10 to 20 mph with gusts up to 35 mph. .THURSDAY AND THURSDAY NIGHT...Showers likely and chance of thunderstorms. Highs in the lower to mid 60s. Lows near 40. Chance of rain 70 percent. .FRIDAY...Mostly cloudy with a 50 percent chance of thunderstorms. Highs in the lower to mid 60s. .FRIDAY NIGHT...Mostly cloudy with a chance of showers and slight chance of thunderstorms. Lows near 40. Chance of rain 30 percent. .SATURDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs near 70. .SATURDAY NIGHT...Partly cloudy. Lows in the lower to mid 40s. .SUNDAY...Mostly sunny with a 10 percent chance of thunderstorms. Highs 72 to 78. .SUNDAY NIGHT...Partly cloudy. Lows in the mid to upper 40s. .MEMORIAL DAY...Mostly sunny with a 10 percent chance of thunderstorms. Highs 74 to 80. $$ COZ042>045-190900- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- Including Briggsdale, Grover, Pawnee Buttes, Raymer, Stoneham, Eaton, Fort Lupton, Greeley, Roggen, Brush, Fort Morgan, Goodrich, Wiggins, Bennett, Byers, Deer Trail, and Leader 1248 PM MDT Mon May 18 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... .REST OF TODAY...Rain showers and slight chance of thunderstorms. Highs in the lower to mid 40s. Northeast winds 10 to 20 mph with gusts up to 30 mph. .TONIGHT...Mostly cloudy. Slight chance of rain showers in the evening. Lows in the lower to mid 30s. North winds 10 to 20 mph with gusts up to 30 mph in the evening, becoming light. Chance of rain 10 percent. .TUESDAY...Partly cloudy in the morning, then becoming mostly cloudy. Highs in the 50s. .TUESDAY NIGHT...Cloudy with a 40 percent chance of showers. Lows in the mid to upper 30s. .WEDNESDAY...Rain showers likely and chance of thunderstorms. Highs around 60. Southeast winds 10 to 20 mph with gusts up to 35 mph. Chance of rain 70 percent. .WEDNESDAY NIGHT...Mostly cloudy with a chance of showers and slight chance of thunderstorms. Lows in the mid 30s to lower 40s. Southeast winds 10 to 15 mph with gusts up to 20 mph. Chance of rain 40 percent. .THURSDAY AND THURSDAY NIGHT...Showers likely and chance of thunderstorms. Highs in the upper 60s. Lows near 40. Chance of rain 70 percent. .FRIDAY...Mostly cloudy with a 40 percent chance of thunderstorms. Highs in the mid 60s. .FRIDAY NIGHT AND SATURDAY...Partly cloudy with a 20 percent chance of thunderstorms. Lows near 40. Highs in the mid 70s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower to mid 40s. Highs near 80. .SUNDAY NIGHT...Partly cloudy. Lows in the mid to upper 40s. .MEMORIAL DAY...Mostly sunny. Highs in the lower to mid 80s. $$ COZ046-047-190900- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Including Agate, Hugo, Limon, Matheson, Forder, Karval, Kutch, and Punkin Center 1248 PM MDT Mon May 18 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... .REST OF TODAY...Slight chance of thunderstorms. Chance of showers early in the afternoon, then showers late in the afternoon. Highs 46 to 56. Northeast winds 10 to 20 mph with gusts up to 40 mph. .TONIGHT...Mostly cloudy. Windy. Lows near 30. North winds 20 to 30 mph with gusts up to 45 mph, diminishing to 15 to 20 mph with gusts up to 35 mph after midnight. .TUESDAY...Partly cloudy. Highs 54 to 60. East winds 10 to 15 mph with gusts up to 20 mph in the afternoon. .TUESDAY NIGHT...Cloudy with a 50 percent chance of rain showers. Lows 33 to 39. East winds 10 to 15 mph with gusts up to 25 mph. .WEDNESDAY...Mostly cloudy with a chance of rain showers and slight chance of thunderstorms. Highs in the mid to upper 50s. Southeast winds 15 to 25 mph with gusts up to 35 mph. Chance of rain 40 percent. .WEDNESDAY NIGHT...Showers and chance of thunderstorms. Lows in the mid to upper 30s. Southeast winds 10 to 15 mph with gusts up to 25 mph. .THURSDAY...Showers likely and chance of thunderstorms. Highs in the 60s. Chance of rain 70 percent. .THURSDAY NIGHT...Showers and chance of thunderstorms. Lows near 40. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy with a chance of showers and slight chance of thunderstorms. Highs in the mid to upper 60s. Lows near 40. Chance of rain 30 percent. .SATURDAY AND SATURDAY NIGHT...Partly cloudy with a 20 percent chance of thunderstorms. Highs in the lower to mid 70s. Lows in the lower to mid 40s. .SUNDAY...Mostly sunny. Highs in the mid to upper 70s. .SUNDAY NIGHT...Partly cloudy. Lows 42 to 48. .MEMORIAL DAY...Mostly sunny. Highs near 80. $$ COZ048>051-190900- Logan County-Washington County-Sedgwick County-Phillips County- Including Crook, Merino, Sterling, Peetz, Akron, Cope, Last Chance, Otis, Julesburg, Ovid, Sedgwick, Amherst, Haxtun, and Holyoke 1248 PM MDT Mon May 18 2026 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM MDT TUESDAY... .REST OF TODAY...Chance of showers early in the afternoon, then showers and slight chance of thunderstorms late in the afternoon. Highs in the mid 40s. Northeast winds 15 to 25 mph with gusts up to 35 mph. .TONIGHT...Mostly cloudy. Slight chance of rain showers early in the evening. Lows in the lower 30s. North winds 15 to 25 mph. Gusts up to 35 mph in the evening. Chance of rain 10 percent. .TUESDAY...Partly cloudy. Highs in the mid 50s to lower 60s. Northwest winds 10 to 15 mph with gusts up to 20 mph in the morning, becoming light. .TUESDAY NIGHT...Mostly cloudy. Chance of showers after midnight. Lows in the upper 30s. South winds 10 to 15 mph with gusts up to 25 mph after midnight. Chance of rain 30 percent. .WEDNESDAY...Mostly cloudy with a chance of showers and slight chance of thunderstorms. Highs in the mid 50s to lower 60s. Southeast winds 15 to25 mph with gusts up to 40 mph. Chance of rain 40 percent. .WEDNESDAY NIGHT...Mostly cloudy with a 40 percent chance of showers. Lows in the upper 30s. Southeast winds 10 to 15 mph with gusts up to 30 mph. .THURSDAY...Showers likely and chance of thunderstorms. Highs in the 60s. Chance of rain 60 percent. .THURSDAY NIGHT...Showers and chance of thunderstorms. Lows around 40. .FRIDAY...Mostly cloudy with a 50 percent chance of thunderstorms. Highs in the mid 60s. .FRIDAY NIGHT...Partly cloudy with a 30 percent chance of showers. Lows around 40. .SATURDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs in the mid 70s. .SATURDAY NIGHT THROUGH MEMORIAL DAY...Mostly clear. Lows in the mid 40s. Highs 80 to 86. $$ COZ035-190900- Larimer and Boulder Counties Between 6000 and 9000 Feet- Including Estes Park, Glendevey, Nederland, and Red Feather Lakes 1248 PM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 PM MDT THIS EVENING... .REST OF TODAY...Snow showers and slight chance of thunderstorms. New snow accumulation of 3 to 5 inches. Highs 30 to 36. Northeast winds 10 to 15 mph with gusts up to 20 mph. .TONIGHT...Patchy fog through the night. Snow showers likely in the evening. Chance of snow showers after midnight. New snow accumulation of 1 to 2 inches. Lows 20 to 28. Chance of snow 70 percent. .TUESDAY...Mostly cloudy. Slight chance of snow showers in the morning, then a chance of snow showers, rain showers and slight chance of thunderstorms in the afternoon. Highs 35 to 45. Chance of precipitation 50 percent. .TUESDAY NIGHT...Mostly cloudy with a chance of rain and snow showers. Lows 25 to 35. Chance of precipitation 40 percent. .WEDNESDAY...Rain showers likely, chance of thunderstorms and slight chance of snow showers. Highs 45 to 55. Chance of precipitation 70 percent. .WEDNESDAY NIGHT...Partly cloudy with a 20 percent chance of thunderstorms. Lows 27 to 37. .THURSDAY...Rain showers likely and chance of thunderstorms. Highs 51 to 61. Chance of rain 70 percent. .THURSDAY NIGHT...Rain showers likely, chance of thunderstorms and snow showers. Lows 30 to 40. Chance of precipitation 70 percent. .FRIDAY...Mostly cloudy with a chance of thunderstorms and slight chance of snow showers. Highs 52 to 62. Chance of snow 40 percent. .FRIDAY NIGHT...Partly cloudy with a 20 percent chance of rain showers. Lows 31 to 41. .SATURDAY...Partly cloudy with a 30 percent chance of thunderstorms. Highs 59 to 69. .SATURDAY NIGHT...Mostly clear. Lows 35 to 45. .SUNDAY...Mostly sunny with a 10 percent chance of thunderstorms. Highs 65 to 75. .SUNDAY NIGHT...Partly cloudy. Lows 40 to 50. .MEMORIAL DAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs 69 to 79. $$ COZ036-190900- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Including Bailey, Central City, Evergreen, Georgetown, Idaho Springs, and Westcreek 1248 PM MDT Mon May 18 2026 .REST OF TODAY...Rain and snow showers. Chance of thunderstorms early in the afternoon, then a slight chance of thunderstorms late in the afternoon. Snow accumulation up to 3 inches. Highs 33 to 43. North winds 10 to 15 mph with gusts up to 20 mph. .TONIGHT...Rain and snow showers likely early in the evening, then a chance of snow showers overnight. Patchy fog through the night. Snow accumulation up to 1 inch. Lows 24 to 32. Chance of precipitation 60 percent. .TUESDAY...Patchy fog in the morning. Slight chance of snow showers in the morning, then rain showers likely, chance of snow showers and slight chance of thunderstorms in the afternoon. Snow accumulation up to 1 inch. Highs 37 to 47. Chance of precipitation 60 percent. .TUESDAY NIGHT...Rain showers likely and slight chance of snow showers. Snow accumulation up to 1 inch. Lows 29 to 37. Chance of precipitation 70 percent. .WEDNESDAY...Rain showers, chance of thunderstorms and snow showers. Highs 48 to 58. .WEDNESDAY NIGHT...Rain showers likely and slight chance of thunderstorms. Lows 30 to 40. Chance of rain 60 percent. .THURSDAY...Rain showers likely and chance of thunderstorms. Highs 54 to 64. Chance of rain 70 percent. .THURSDAY NIGHT...Mostly cloudy with a chance of rain showers and slight chance of thunderstorms. Lows 32 to 42. Chance of rain 50 percent. .FRIDAY...Mostly cloudy with a 50 percent chance of thunderstorms. Highs 55 to 65. .FRIDAY NIGHT...Mostly cloudy with a chance of rain showers and slight chance of thunderstorms. Lows 33 to 43. Chance of rain 30 percent. .SATURDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs 61 to 71. .SATURDAY NIGHT...Partly cloudy. Lows 36 to 46. .SUNDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs 66 to 76. .SUNDAY NIGHT...Partly cloudy. Lows 40 to 50. .MEMORIAL DAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs 69 to 79. $$ COZ030-190900- Jackson County Below 9000 Feet- Including Gould, North Park, Rand, Spicer, and Walden 1248 PM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 PM MDT THIS EVENING... .REST OF TODAY...Snow showers and chance of thunderstorms. New snow accumulation of 3 to 4 inches. Highs in the lower to mid 30s. Northeast winds 10 to 15 mph with gusts up to 20 mph. .TONIGHT...Mostly cloudy. Chance of snow showers until early morning, then a slight chance of snow showers towards sunrise. Lows 19 to 23. Chance of snow 50 percent. .TUESDAY...Mostly cloudy. Chance of snow showers, rain showers and slight chance of thunderstorms in the afternoon. Highs in the lower to mid 40s. Chance of precipitation 30 percent. .TUESDAY NIGHT...Slight chance of rain showers in the evening. Mostly cloudy with a slight chance of snow showers. Lows in the 20s. Chance of precipitation 20 percent. .WEDNESDAY...Partly cloudy with a chance of rain showers, snow showers and slight chance of thunderstorms. Highs near 50. Chance of precipitation 30 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the 20s. .THURSDAY...Mostly cloudy with a 50 percent chance of thunderstorms. Highs in the 50s. .THURSDAY NIGHT...Rain showers likely, chance of snow showers and slight chance of thunderstorms. Lows in the mid 20s to lower 30s. Chance of precipitation 60 percent. .FRIDAY...Mostly cloudy with a chance of thunderstorms and slight chance of snow showers. Highs in the 50s. Chance of snow 30 percent. .FRIDAY NIGHT...Partly cloudy. Lows in the mid 20s to lower 30s. .SATURDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs near 60. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower to mid 30s. Highs in the mid to upper 60s. .SUNDAY NIGHT...Partly cloudy. Lows 32 to 38. .MEMORIAL DAY...Mostly sunny with a 20 percent chance of thunderstorms. Highs in the lower 70s. $$ COZ032-190900- Grand and Summit Counties Below 9000 Feet- Including Dillon, Fraser, Granby, Grand Lake, Hot Sulphur Springs, and Kremmling 1248 PM MDT Mon May 18 2026 .REST OF TODAY...Snow showers, rain showers and chance of thunderstorms. Snow accumulation up to 1 inch. Highs 38 to 46. West winds 10 to 15 mph with gusts up to 20 mph. .TONIGHT...Mostly cloudy. Slight chance of rain showers in the evening. Chance of snow showers through the night. Lows in the mid to upper 20s. Chance of precipitation 50 percent. .TUESDAY...Partly cloudy in the morning, then mostly cloudy with a chance of rain showers, slight chance of thunderstorms and snow showers in the afternoon. Highs 46 to 54. Chance of precipitation 50 percent. .TUESDAY NIGHT...Mostly cloudy with a slight chance of snow showers. Chance ofrain showers in the evening, then a slight chance of rain showers after midnight. Lows 26 to 32. Chance of precipitation 30 percent. .WEDNESDAY...Rain showers likely, chance of thunderstorms and slight chance of snow showers. Highs 50 to 58. Chance of precipitation 60 percent. .WEDNESDAY NIGHT...Partly cloudy with a 10 percent chance of rain showers. Lows 25 to 31. .THURSDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs 54 to 62. .THURSDAY NIGHT...Mostly cloudy with a chance of thunderstorms and snow showers. Lows 27 to 33. Chance of snow 40 percent. .FRIDAY...Mostly cloudy with a slight chance of thunderstorms and snow showers. Highs 54 to 62. Chance of snow 20 percent. .FRIDAY NIGHT...Partly cloudy. Lows 27 to 33. .SATURDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs 59 to 67. .SATURDAY NIGHT...Partly cloudy. Lows 30 to 36. .SUNDAY...Mostly sunny. Highs 65 to 73. .SUNDAY NIGHT...Partly cloudy. Lows 33 to 39. .MEMORIAL DAY...Mostly sunny with a 20 percent chance of thunderstorms. Highs 69 to 77. $$ COZ037-190900- Central and Southeast Park County- Including Fairplay, Hartsel, Lake George, and South Park 1248 PM MDT Mon May 18 2026 .REST OF TODAY...Snow showers and chance of thunderstorms early in the afternoon, then a chance of snow showers and slight chance of thunderstorms late in the afternoon. No snow accumulation. Highs 42 to 48. Southwest winds 15 to 25 mph with gusts up to 40 mph. .TONIGHT...Partly cloudy. Slight chance of snow showers in the evening. Lows in the mid to upper 20s. Chance of snow 10 percent. .TUESDAY...Mostly cloudy. Chance of rain showers, slight chance of thunderstorms and snow showers in the afternoon. Highs 44 to 52. Southeast winds 10 to 15 mph in the afternoon. Chance of precipitation 50 percent. .TUESDAY NIGHT...Snow showers likely. Chance of rain showers and slight chance of thunderstorms in the evening, then rain showers likely after midnight. Snow accumulation up to 1 inch. Lows 29 to 35. Southeast winds 10 to 15 mph in the evening, becoming light. Chance of precipitation 70 percent. .WEDNESDAY...Rain showers with snow showers likely and chance of thunderstorms. Highs 46 to 54. South winds 10 to 15 mph with gusts up to 25 mph. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers, slight chance of thunderstorms and snow showers. Lows 29 to 35. Chance of precipitation 50 percent. .THURSDAY...Mostly cloudy with a chance of thunderstorms and slight chance of snow showers. Highs 53 to 61. Chance of snow 40 percent. .THURSDAY NIGHT...Mostly cloudy with a chance of rain showers, slight chance of thunderstorms and snow showers. Lows 30 to 36. Chance of precipitation 30 percent. .FRIDAY...Partly cloudy with a 30 percent chance of thunderstorms. Highs 54 to 62. .FRIDAY NIGHT...Mostly cloudy with a chance of rain showers and slight chance of thunderstorms. Lows 31 to 37. Chance of rain 30 percent. .SATURDAY...Partly cloudy with a 30 percent chance of thunderstorms. Highs 59 to 65. .SATURDAY NIGHT...Partly cloudy. Lows 33 to 39. .SUNDAY...Mostly sunny with a 20 percent chance of thunderstorms. Highs 63 to 69. .SUNDAY NIGHT...Partly cloudy. Lows 35 to 41. .MEMORIAL DAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs 65 to 71. $$ COZ033-190900- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- Including Cameron Pass, Laramie and Medicine Bow Mountains, Rabbit Ears Range, Rocky Mountain National Park, and Willow Creek Pass 1248 PM MDT Mon May 18 2026 .REST OF TODAY...Snow showers and chance of thunderstorms. New snow accumulation of 5 to 6 inches. Highs 25 to 35. .TONIGHT...Patchy fog in the evening. Snow showers likely in the evening, then a chance of snow showers after midnight. New snowaccumulation of 1 to 2 inches. Lows 16 to 24. Chance of snow 70 percent. .TUESDAY...Mostly cloudy. Slight chance of snow showers in the morning, then a chance of snow showers and slight chance of thunderstorms in the afternoon. Highs 31 to 41. Chance of snow 50 percent. .TUESDAY NIGHT...Mostly cloudy. Chance of snow showers in the evening, then a slight chance of snow showers after midnight. Lows 19 to 29. Chance of snow 30 percent. .WEDNESDAY...Mostly cloudy with a chance of snow showers and thunderstorms. Highs 38 to 48. Chance of snow 50 percent. .WEDNESDAY NIGHT...Partly cloudy with a 10 percent chance of snow showers. Lows 19 to 29. .THURSDAY...Snow showers, rain showers likely and chance of thunderstorms. Highs 41 to 51. Chance of precipitation 60 percent. .THURSDAY NIGHT...Snow showers, rain showers likely and chance of thunderstorms. Lows 22 to 32. Chance of precipitation 70 percent. .FRIDAY...Mostly cloudy with a chance of snow showers and thunderstorms. Highs 42 to 52. Chance of snow 40 percent. .FRIDAY NIGHT...Partly cloudy. Lows 23 to 33. .SATURDAY...Partly cloudy with a chance of thunderstorms and snow showers. Highs 48 to 58. Chance of snow 30 percent. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows 27 to 37. Highs 55 to 65. .SUNDAY NIGHT...Partly cloudy. Lows 31 to 41. .MEMORIAL DAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs 59 to 69. $$ COZ031-190900- West Jackson and West Grand Counties Above 9000 Feet- Including Mt Zirkel 1248 PM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 PM MDT THIS EVENING... .REST OF TODAY...Snow showers and chance of thunderstorms. New snow accumulation of 3 to 6 inches. Highs 29 to 39. West winds 10 to 15 mph with gusts up to 25 mph. .TONIGHT...Snow showers likely in the evening, then a chance of snow showers after midnight. New snow accumulation up to 2 inches. Lows 16 to 24. Chance of snow 60 percent. .TUESDAY...Partly cloudy in the morning, then mostly cloudy with a slight chance of thunderstorms and snow showers in the afternoon. Highs 35 to 45. Chance of snow 20 percent. .TUESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows 21 to 29. .WEDNESDAY...Partly cloudy with a slight chance of thunderstorms and snow showers. Highs 41 to 51. Chance of snow 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows 22 to 28. .THURSDAY...Mostly cloudy with a chance of thunderstorms and snow showers. Highs 45 to 55. Chance of snow 50 percent. .THURSDAY NIGHT...Snow showers, rain showers likely and slight chance of thunderstorms. Lows 26 to 32. Chance of precipitation 60 percent. .FRIDAY...Mostly cloudy with a slight chance of thunderstorms and snow showers. Highs 45 to 55. Chance of snow 20 percent. .FRIDAY NIGHT...Partly cloudy. Lows 26 to 32. .SATURDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs 52 to 62. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows 31 to 41. Highs 58 to 68. .MEMORIAL DAY...Mostly sunny with a 10 percent chance of thunderstorms. Highs 62 to 72. $$ COZ034-190900- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet- Including Berthoud Pass, Breckenridge, East Slopes Mosquito Range, East Slopes Southern Gore Range, Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Blue Sky, Williams Fork Mountains, and Winter Park 1248 PM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 PM MDT THIS EVENING... .REST OF TODAY...Snow showers. Chance of thunderstorms early in the afternoon, then a slight chance of thunderstorms late in the afternoon. New snow accumulation of 1 to 4 inches. Highs 30 to 40. Southwest winds 10 to 15 mph with gusts up to 30 mph. .TONIGHT...Mostly cloudy. Chance of snow showers until early morning, then a slight chance of snow showers towards sunrise. Lows 17 to 27. Chance of snow 50 percent. .TUESDAY...Slight chance of snow showers in the morning, then snow showers likely, chance of rain showers and slight chance of thunderstorms in the afternoon. Snow accumulation up to 3 inches. Highs 34 to 44. South winds 10 to 15 mph in the afternoon. Chance of precipitation 60 percent. .TUESDAY NIGHT...Snow showers likely and slight chance of thunderstorms in the evening, then a chance of snow showers after midnight. Snow accumulation of 1 to 3 inches. Lows 23 to 33. Chance of snow 70 percent. .WEDNESDAY...Snow showers, rain showers and chance of thunderstorms. Highs 38 to 48. .WEDNESDAY NIGHT...Partly cloudy with a chance of snow showers, rain showers and slight chance of thunderstorms. Lows 20 to 30. Chance of precipitation 30 percent. .THURSDAY...Partly cloudy with a chance of thunderstorms and snow showers. Highs 42 to 52. Chance of snow 50 percent. .THURSDAY NIGHT...Mostly cloudy with a chance of snow showers, rain showers and slight chance of thunderstorms. Lows 22 to 32. Chance of precipitation 50 percent. .FRIDAY...Partly cloudy with a chance of thunderstorms and snow showers. Highs 44 to 54. Chance of snow 40 percent. .FRIDAY NIGHT...Partly cloudy with a slight chance of thunderstorms and snow showers. Lows 24 to 34. Chance of snow 10 percent. .SATURDAY...Partly cloudy with a chance of thunderstorms and snow showers. Highs 49 to 59. Chance of snow 30 percent. .SATURDAY NIGHT...Mostly clear. Lows 27 to 37. .SUNDAY...Mostly sunny with a 20 percent chance of thunderstorms. Highs 54 to 64. .SUNDAY NIGHT...Partly cloudy. Lows 30 to 40. .MEMORIAL DAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs 58 to 68. $$