FNUS55 KBYZ 180717 FWFBYZ Fire Weather Planning Forecast for SCen and SErn Montana National Weather Service Billings MT 117 AM MDT Mon May 18 2026 .DISCUSSION... Cool, breezy and unsettled conditions will remain over the region today, bringing isolated to scattered showers, greatest over the southern mountains/foothills and into the far southeast. Warmer conditions build into the region for Tuesday into Wednesday, with a few showers lingering over western areas Tuesday. The next disturbance to affect the region brings shower/thunderstorm chances by Wednesday evening, with periods of showers and a brief cool down possible through Thursday as a cold front drops through the region. There are currently low to moderate chances for wetting rains during this period, with the potential for snow accumulations in the high country. Conditions trend warmer and drier through the end of the week. Palmquist MTZ123-182230- Gallatin National Forest- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Mostly cloudy. Scattered snow showers in the morning, then isolated snow showers in the afternoon. * Max temperature.......41-51 at 5000 feet...31-41 at 7000 feet. * 24 hr trend.........1 degree warmer. * Min humidity..........34-44 percent at 5000 feet...40-50 percent at 7000 feet. * 24 hr trend.........13 percent drier. * Wind (20 ft) * Slope/valley.........North winds 5 to 15 mph. * Ridgetop.............North 5 to 15 mph. * Chance of lightning...8 percent. * CWR...................10 percent. .TONIGHT... * Sky/weather...........Mostly clear. * Min temperature.......23-29 at 5000 feet...16-26 at 7000 feet. * 24 hr trend.........1 degree warmer. * Max humidity..........69-79 percent at 5000 feet...67-77 percent at 7000 feet. * 24 hr trend.........29 percent drier. * Wind (20 ft) * Slope/valley.........South winds 5 to 10 mph. * Ridgetop.............Southwest 5 to 10 mph. * Chance of lightning...2 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Mostly sunny. * Max temperature.......55-64 at 5000 feet...42-52 at 7000 feet. * 24 hr trend.........12 degrees warmer. * Min humidity..........19-29 percent at 5000 feet...26-36 percent at 7000 feet. * 24 hr trend.........17 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 10 mph. * Ridgetop.............West 5 to 10 mph. * Chance of lightning...7 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 31 to 41. Light winds. .WEDNESDAY...Mostly cloudy. Numerous showers and snow showers. Lows 31 to 41. Highs 57 to 67. West winds 5 to 10 mph. .THURSDAY...Partly cloudy. Scattered showers and snow showers. Lows 32 to 41. Highs 54 to 64. West winds 5 to 10 mph. .FRIDAY...Mostly cloudy. Isolated showers and thunderstorms. Lows 35 to 44. Highs 62 to 69. Southwest winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 40 to 50. Highs 69 to 77. .SUNDAY...Mostly sunny. Highs 73 to 81. $$ MTZ124-182230- Wheatland County/Sweet Grass County- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Mostly cloudy with isolated snow showers in the morning, then mostly sunny with isolated rain showers and snow showers in the afternoon. * Max temperature.......46-51. * 24 hr trend.........2 degrees cooler. * Min humidity..........35-40 percent. * 24 hr trend.........1 percent drier. * Wind (20 ft) * Plains...............North winds 10 to 20 mph. Gusts up to 30 mph in the afternoon. * Chance of lightning...7 percent. * CWR...................Less than 10 percent. .TONIGHT... * Sky/weather...........Partly cloudy. * Min temperature.......23-28. * 24 hr trend.........3 degrees cooler. * Max humidity..........81-86 percent. * 24 hr trend.........4 percent wetter. * Wind (20 ft) * Plains...............North winds 5 to 15 mph in the evening shifting to the west 5 to 10 mph overnight. * Chance of lightning...3 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Mostly sunny. * Max temperature.......60-65. * 24 hr trend.........14 degrees warmer. * Min humidity..........24-29 percent. * 24 hr trend.........11 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 15 mph. * Chance of lightning...9 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 34 to 39. West winds 5 to 10 mph. .WEDNESDAY...Mostly cloudy. Numerous showers and isolated thunderstorms. Lows 34 to 39. Highs 61 to 66. Northwest winds 10 to 20 mph. .THURSDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 35 to 40. Highs 58 to 63. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 38 to 43. Highs 64 to 69. West winds 5 to 15 mph. .SATURDAY...Partly cloudy. Lows 42 to 47. Highs 71 to 76. .SUNDAY...Mostly sunny. Highs 75 to 80. $$ MTZ125-182230- Stillwater County- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Mostly cloudy. Scattered snow showers in the morning, then isolated rain showers and snow showers in the afternoon. * Max temperature.......46-51. * 24 hr trend.........3 degrees cooler. * Min humidity..........38-43 percent. * 24 hr trend.........11 percent wetter. * Wind (20 ft) * Plains...............Northwest winds 10 to 20 mph. * Chance of lightning...8 percent. * CWR...................10 percent. .TONIGHT... * Sky/weather...........Mostly cloudy in the evening then clearing. * Min temperature.......25-30. * 24 hr trend.........3 degrees cooler. * Max humidity..........70-75 percent. * 24 hr trend.........17 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...4 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Mostly sunny. Isolated rain showers in the afternoon. * Max temperature.......60-65. * 24 hr trend.........14 degrees warmer. * Min humidity..........25-30 percent. * 24 hr trend.........13 percent drier. * Wind (20 ft) * Plains...............Southeast winds 5 to 10 mph. * Chance of lightning...10 percent. * CWR...................Less than 10 percent. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 34 to 39. Southwest winds 5 to 10 mph. .WEDNESDAY...Mostly cloudy. Showers. Lows 36 to 41. Highs 64 to 69. West winds 5 to 10 mph. .THURSDAY...Mostly cloudy. Numerous showers and isolated thunderstorms. Lows 36 to 41. Highs 58 to 63. West winds 5 to 10 mph. .FRIDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 39 to 44. Highs 67 to 72. South winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 44 to 49. Highs 74 to 79. .SUNDAY...Mostly sunny. Highs 79 to 84. $$ MTZ126-182230- Beartooth Ranger District Custer National Forest- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Mostly cloudy. Numerous snow showers in the morning, then scattered snow showers in the afternoon. * Max temperature.......38-48 at 5000 feet...30-40 at 7000 feet. * 24 hr trend.........1 degree cooler. * Min humidity..........43-53 percent at 5000 feet...55-65 percent at 7000 feet. * 24 hr trend.........13 percent wetter. * Wind (20 ft) * Slope/valley.........Northwest winds 15 to 25 mph with gusts to around 35 mph. * Ridgetop.............Northwest 15 to 30 mph. * Chance of lightning...9 percent. * CWR...................40 percent. .TONIGHT... * Sky/weather...........Mostly cloudy with isolated snow showers in the evening, then mostly clear overnight. * Min temperature.......25-30 at 5000 feet...15-25 at 7000 feet. * 24 hr trend.........1 degree cooler. * Max humidity..........66-76 percent at 5000 feet...64-74 percent at 7000 feet. * 24 hr trend.........22 percent drier. * Wind (20 ft) * Slope/valley.........Northwest winds 5 to 15 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...3 percent. * CWR...................Less than 10 percent. .TUESDAY... * Sky/weather...........Sunny in the morning, then partly sunny with isolated rain and snow showers in the afternoon. * Max temperature.......53-62 at 5000 feet...44-54 at 7000 feet. * 24 hr trend.........14 degrees warmer. * Min humidity..........20-30 percent at 5000 feet...32-42 percent at 7000 feet. * 24 hr trend.........28 percent drier. * Wind (20 ft) * Slope/valley.........South winds 5 to 10 mph in the morning shifting to the east in the afternoon. * Ridgetop.............East 5 to 15 mph. * Chance of lightning...9 percent. * CWR...................Less than 10 percent. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 36 to 42. Southwest winds 5 to 15 mph. .WEDNESDAY...Mostly cloudy. Snow showers. Lows 37 to 42. Highs 59 to 67. West winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Numerous snow showers, isolated showers and thunderstorms. Lows 37 to 42. Highs 51 to 59. Northwest winds 5 to 15 mph. .FRIDAY...Mostly cloudy. Scattered showers, thunderstorms and isolated snow showers. Lows 40 to 47. Highs 59 to 67. West winds 5 to 15 mph. .SATURDAY...Partly cloudy. Lows 44 to 53. Highs 67 to 75. .SUNDAY...Mostly sunny. Highs 71 to 81. $$ MTZ127-182230- Golden Valley County/Musselshell county- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Mostly cloudy. Isolated snow showers in the morning, then isolated rain showers and snow showers in the afternoon. * Max temperature.......43-48. * 24 hr trend.........3 degrees cooler. * Min humidity..........40-45 percent. * 24 hr trend.........9 percent drier. * Wind (20 ft) * Plains...............North winds 10 to 20 mph. Gusts up to 30 mph in the morning. * Chance of lightning...5 percent. * CWR...................Less than 10 percent. .TONIGHT... * Sky/weather...........Partly cloudy. * Min temperature.......26-31. * 24 hr trend.........3 degrees cooler. * Max humidity..........73-78 percent. * 24 hr trend.........10 percent drier. * Wind (20 ft) * Plains...............Northeast winds 5 to 15 mph in the evening shifting to the south 5 to 10 mph overnight. * Chance of lightning...2 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Sunny. * Max temperature.......59-64. * 24 hr trend.........16 degrees warmer. * Min humidity..........20-25 percent. * 24 hr trend.........20 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 15 mph. * Chance of lightning...3 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Not as cool. Partly cloudy. Lows 42 to 47. Southwest winds 5 to 15 mph. .WEDNESDAY...Mostly cloudy. Numerous showers. Lows 42 to 47. Highs 62 to 67. Northwest winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 42 to 47. Highs 57 to 62. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 46 to 51. Highs 63 to 68. Southwest winds 5 to 15 mph. .SATURDAY...Partly cloudy. Lows 51 to 56. Highs 70 to 75. .SUNDAY...Mostly sunny. Highs 74 to 79. $$ MTZ128-182230- Yellowstone County- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Mostly cloudy. Isolated rain showers and snow showers in the morning, then isolated rain showers in the afternoon. * Max temperature.......48-53. * 24 hr trend.........4 degrees cooler. * Min humidity..........35-40 percent. * 24 hr trend.........1 percent drier. * Wind (20 ft) * Plains...............North winds 10 to 20 mph. * Chance of lightning...7 percent. * CWR...................Less than 10 percent. .TONIGHT... * Sky/weather...........Partly cloudy. * Min temperature.......27-32. * 24 hr trend.........5 degrees cooler. * Max humidity..........80-85 percent. * 24 hr trend.........6 percent wetter. * Wind (20 ft) * Plains...............North winds 5 to 15 mph in the evening shifting to the southwest 5 to 10 mph overnight. * Chance of lightning...2 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Sunny. * Max temperature.......65-70. * 24 hr trend.........17 degrees warmer. * Min humidity..........18-23 percent. * 24 hr trend.........17 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 15 mph. * Chance of lightning...3 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Not as cool. Partly cloudy. Lows 41 to 46. Southwest winds 5 to 15 mph. .WEDNESDAY...Mostly cloudy. Numerous showers. Lows 41 to 46. Highs 69 to 74. Northwest winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 40 to 45. Highs 61 to 66. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Lows 43 to 48. Highs 69 to 74. Southwest winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 48 to 53. Highs 77 to 82. .SUNDAY...Mostly sunny. Highs 82 to 87. $$ MTZ129-182230- Crow Indian Reservation/Bighorn Canyon Rec Area- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Scattered snow showers in the morning, then isolated snow showers in the afternoon. * Max temperature.......36-46 at 5000 feet...29-36 at 7000 feet. * 24 hr trend.........7 degrees cooler. * Min humidity..........49-59 percent at 5000 feet...59-69 percent at 7000 feet. * 24 hr trend.........14 percent drier. * Wind (20 ft) * Slope/valley.........Northwest winds 10 to 20 mph. Gusts up to 30 mph in the afternoon. * Ridgetop.............Northwest 15 to 30 mph. * Chance of lightning...7 percent. * CWR...................10 percent. .TONIGHT... * Sky/weather...........Mostly cloudy. * Min temperature.......24-30 at 5000 feet...17-24 at 7000 feet. * 24 hr trend.........5 degrees cooler. * Max humidity..........71-81 percent at 5000 feet...77-87 percent at 7000 feet. * 24 hr trend.........12 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 15 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...2 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Sunny. * Max temperature.......53-63 at 5000 feet...45-52 at 7000 feet. * 24 hr trend.........18 degrees warmer. * Min humidity..........19-29 percent at 5000 feet...27-33 percent at 7000 feet. * 24 hr trend.........26 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 10 mph. * Ridgetop.............West 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Not as cool. Partly cloudy. Lows 36 to 44. South winds 5 to 10 mph. .WEDNESDAY...Mostly cloudy. Scattered showers. Lows 37 to 43. Highs 58 to 68. Northwest winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 37 to 42. Highs 50 to 60. West winds 5 to 15 mph. .FRIDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 40 to 46. Highs 59 to 69. Southwest winds 5 to 15 mph. .SATURDAY...Partly cloudy. Lows 45 to 53. Highs 67 to 77. .SUNDAY...Mostly sunny. Isolated showers and thunderstorms. Highs 71 to 81. $$ MTZ130-182230- Northern Rosebud/Northern Treasure Counties- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Isolated rain showers and snow showers in the morning, then isolated rain showers in the afternoon. * Max temperature.......46-51. * 24 hr trend.........8 degrees cooler. * Min humidity..........42-47 percent. * 24 hr trend.........6 percent drier. * Wind (20 ft) * Plains...............Northwest winds 10 to 20 mph. * Chance of lightning...3 percent. * CWR...................Less than 10 percent. .TONIGHT... * Sky/weather...........Mostly cloudy in the evening then clearing. Patchy fog overnight. * Min temperature.......26-31. * 24 hr trend.........6 degrees cooler. * Max humidity..........92-97 percent. * 24 hr trend.........12 percent wetter. * Wind (20 ft) * Plains...............North winds 5 to 15 mph in the evening becoming light overnight. * Chance of lightning...2 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Sunny. * Max temperature.......63-68. * 24 hr trend.........17 degrees warmer. * Min humidity..........20-25 percent. * 24 hr trend.........22 percent drier. * Wind (20 ft) * Plains...............Southwest winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 38 to 43. South winds 5 to 10 mph. .WEDNESDAY...Mostly cloudy. Scattered showers. Lows 40 to 45. Highs 69 to 74. Northwest winds 5 to 10 mph. .THURSDAY...Mostly cloudy. Scattered showers. Lows 39 to 44. Highs 62 to 67. Northwest winds 5 to 10 mph. .FRIDAY...Partly cloudy. Isolated showers. Lows 41 to 46. Highs 69 to 74. Southwest winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 46 to 51. Highs 76 to 81. .SUNDAY...Mostly sunny. Isolated showers and thunderstorms. Highs 80 to 85. $$ MTZ131-182230- Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Scattered snow showers and isolated rain showers in the morning, then isolated rain showers and snow showers in the afternoon. * Max temperature.......43-48. * 24 hr trend.........9 degrees cooler. * Min humidity..........45-50 percent. * 24 hr trend.........4 percent wetter. * Wind (20 ft) * Slope/valley.........Northwest winds 10 to 20 mph. * Ridgetop.............North 15 to 25 mph. * Chance of lightning...4 percent. * CWR...................10 percent. .TONIGHT... * Sky/weather...........Mostly cloudy. * Min temperature.......24-29. * 24 hr trend.........7 degrees cooler. * Max humidity..........89-94 percent. * 24 hr trend.........5 percent wetter. * Wind (20 ft) * Slope/valley.........Northwest winds 5 to 10 mph. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...2 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Sunny. * Max temperature.......61-66. * 24 hr trend.........18 degrees warmer. * Min humidity..........18-23 percent. * 24 hr trend.........27 percent drier. * Wind (20 ft) * Slope/valley.........West winds 5 to 10 mph. * Ridgetop.............West 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 35 to 40. South winds 5 to 15 mph. .WEDNESDAY...Mostly cloudy. Scattered showers. Lows 38 to 43. Highs 69 to 74. Northwest winds 5 to 15 mph. .THURSDAY...Cooler. Mostly cloudy. Numerous showers. Lows 35 to 40. Highs 59 to 64. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Isolated showers. Lows 39 to 44. Highs 67 to 72. Southwest winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 43 to 48. Highs 75 to 80. .SUNDAY...Mostly sunny. Isolated showers and thunderstorms. Highs 80 to 85. $$ MTZ132-182230- Custer County- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Isolated rain showers and snow showers. * Max temperature.......42-47. * 24 hr trend.........11 degrees cooler. * Min humidity..........53-58 percent. * 24 hr trend.........5 percent wetter. * Wind (20 ft) * Plains...............Northwest winds 10 to 20 mph. * Chance of lightning...3 percent. * CWR...................10 percent. .TONIGHT... * Sky/weather...........Mostly cloudy with isolated rain showers. * Min temperature.......28-33. * 24 hr trend.........4 degrees cooler. * Max humidity..........91-96 percent. * 24 hr trend.........3 percent drier. * Wind (20 ft) * Plains...............Northwest winds 5 to 15 mph. * Chance of lightning...1 percent. * CWR...................Less than 10 percent. .TUESDAY... * Sky/weather...........Mostly sunny. * Max temperature.......57-62. * 24 hr trend.........15 degrees warmer. * Min humidity..........22-27 percent. * 24 hr trend.........31 percent drier. * Wind (20 ft) * Plains...............West winds 5 to 10 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 38 to 43. South winds 5 to 15 mph. .WEDNESDAY...Warmer. Mostly cloudy. Scattered showers. Lows 41 to 46. Highs 68 to 73. West winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Scattered showers. Lows 39 to 44. Highs 60 to 65. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Lows 42 to 47. Highs 65 to 70. Southwest winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 47 to 52. Highs 72 to 77. .SUNDAY...Mostly sunny. Highs 77 to 82. $$ MTZ133-182230- Sioux Ranger District Custer National Forest- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Numerous rain showers in the morning, then scattered rain showers in the afternoon. * Max temperature.......43-48. * 24 hr trend.........13 degrees cooler. * Min humidity..........56-61 percent. * 24 hr trend.........11 percent wetter. * Wind (20 ft) * Plains...............Northwest winds 10 to 20 mph. * Chance of lightning...2 percent. * CWR...................15 percent. .TONIGHT... * Sky/weather...........Mostly cloudy. Scattered rain showers in the evening. * Min temperature.......28-33. * 24 hr trend.........4 degrees cooler. * Max humidity..........93-98 percent. * 24 hr trend.........6 percent wetter. * Wind (20 ft) * Plains...............Northwest winds 5 to 15 mph. * Chance of lightning...1 percent. * CWR...................10 percent. .TUESDAY... * Sky/weather...........Mostly sunny. * Max temperature.......57-62. * 24 hr trend.........14 degrees warmer. * Min humidity..........21-26 percent. * 24 hr trend.........35 percent drier. * Wind (20 ft) * Plains...............Northwest winds 5 to 15 mph. * Chance of lightning...0 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows 33 to 38. Southeast winds 5 to 15 mph. .WEDNESDAY...Warmer. Partly cloudy. Lows 40 to 45. Highs 69 to 74. South winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Scattered showers. Lows 37 to 42. Highs 61 to 66. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Isolated showers. Lows 40 to 45. Highs 65 to 70. West winds 5 to 15 mph. .SATURDAY...Partly cloudy. Lows 45 to 50. Highs 73 to 78. .SUNDAY...Mostly sunny. Highs 80 to 85. $$ WYZ274-182230- Sheridan County- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Snow showers and isolated rain showers in the morning, then scattered rain showers and snow showers in the afternoon. * Max temperature.......41-46. * 24 hr trend.........8 degrees cooler. * Min humidity..........52-57 percent. * 24 hr trend.........3 percent wetter. * Wind (20 ft) * Slope/valley.........Northwest winds 10 to 20 mph. Gusts up to 30 mph in the afternoon. * Ridgetop.............Northwest 15 to 30 mph. * Chance of lightning...8 percent. * CWR...................15 percent. .TONIGHT... * Sky/weather...........Mostly cloudy in the evening then clearing. * Min temperature.......22-27. * 24 hr trend.........6 degrees cooler. * Max humidity..........87-92 percent. * 24 hr trend.........4 percent drier. * Wind (20 ft) * Slope/valley.........Northwest winds 5 to 15 mph in the evening becoming light overnight. * Ridgetop.............Northwest 10 to 20 mph. * Chance of lightning...3 percent. * CWR...................Zero. .TUESDAY... * Sky/weather...........Sunny. * Max temperature.......58-63. * 24 hr trend.........17 degrees warmer. * Min humidity..........26-31 percent. * 24 hr trend.........26 percent drier. * Wind (20 ft) * Slope/valley.........South winds 5 to 10 mph in the morning shifting to the northeast in the afternoon. * Ridgetop.............East 5 to 10 mph. * Chance of lightning...1 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows 29 to 34. South winds 5 to 10 mph. .WEDNESDAY...Partly cloudy. Scattered showers. Lows 34 to 39. Highs 65 to 70. Northwest winds 5 to 10 mph. .THURSDAY...Mostly cloudy. Numerous showers and isolated thunderstorms. Lows 31 to 36. Highs 56 to 61. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Scattered showers and isolated thunderstorms. Lows 34 to 39. Highs 65 to 70. West winds 5 to 10 mph. .SATURDAY...Partly cloudy. Lows 38 to 43. Highs 73 to 78. .SUNDAY...Mostly sunny. Highs 78 to 83. $$ WYZ284-182230- Bighorn National Forest- 117 AM MDT Mon May 18 2026 .Today... * Sky/weather...........Cloudy. Snow showers in the morning, then scattered snow showers in the afternoon. * Max temperature.......26-31. * 24 hr trend.........3 degrees cooler. * Min humidity..........72-77 percent. * 24 hr trend.........14 percent drier. * Wind (20 ft) * At Burgess Jct.......North winds 10 to 20 mph. * Chance of lightning...8 percent. * CWR...................50 percent. .TONIGHT... * Sky/weather...........Mostly cloudy with isolated snow showers in the evening, then mostly clear overnight. * Min temperature.......10-15. * 24 hr trend.........6 degrees cooler. * Max humidity..........84-89 percent. * 24 hr trend.........12 percent drier. * Wind (20 ft) * At Burgess Jct.......West winds 5 to 15 mph. * Chance of lightning...3 percent. * CWR...................Less than 10 percent. .TUESDAY... * Sky/weather...........Mostly sunny. * Max temperature.......41-46. * 24 hr trend.........15 degrees warmer. * Min humidity..........33-38 percent. * 24 hr trend.........39 percent drier. * Wind (20 ft) * At Burgess Jct.......West winds 5 to 15 mph. * Chance of lightning...4 percent. * CWR...................Zero. .Forecast days 3 through 7...... .TUESDAY NIGHT...Not as cold. Partly cloudy. Lows 23 to 28. Southwest winds 5 to 15 mph. .WEDNESDAY...Mostly cloudy. Scattered showers and snow showers. Lows 26 to 31. Highs 48 to 53. West winds 5 to 15 mph. .THURSDAY...Mostly cloudy. Snow showers and isolated thunderstorms. Lows 24 to 29. Highs 41 to 46. Northwest winds 5 to 15 mph. .FRIDAY...Partly cloudy. Scattered showers, snow showers and isolated thunderstorms. Lows 29 to 34. Highs 48 to 53. West winds 5 to 15 mph. .SATURDAY...Partly cloudy. Lows 36 to 41. Highs 55 to 60. .SUNDAY...Mostly sunny. Isolated showers and thunderstorms. Highs 60 to 65. $$ weather.gov/billings