FPUS55 KPIH 181802 ZFPPIH Zone Forecast Product FOR Idaho National Weather Service Pocatello ID 1202 PM MDT Mon May 18 2026 This forecast may not be representative of the exact location you are interested in. For a site-specific forecast, please visit weather.gov/Pocatello and click the map on the main page. IDZ072-191000- Sawtooth/Stanley Basin- Including Stanley 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 23 to 33. .TUESDAY...Increasing clouds. A slight chance of through the day. Highs 50 to 60. .TUESDAY NIGHT...Mostly cloudy in the evening then clearing. Lows 26 to 36. .WEDNESDAY...Mostly cloudy. Highs 52 to 62. .WEDNESDAY NIGHT...Partly cloudy. Lows 26 to 36. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 53 to 63. Lows 30 to 40. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 62 to 72. Lows 31 to 41. .SATURDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 67 to 77. Lows 35 to 45. $$ IDZ073-191000- Sun Valley Region- Including Ketchum, Sun Valley, and Galena 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 26 to 33. .TUESDAY...Increasing clouds. A slight chance of through the day. Highs 51 to 61. .TUESDAY NIGHT...Mostly cloudy in the evening then clearing. Lows 28 to 37. .WEDNESDAY...Mostly sunny. Highs 55 to 65. .WEDNESDAY NIGHT...Partly cloudy. Lows 29 to 38. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 54 to 64. Lows 31 to 41. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 64 to 74. Lows 34 to 44. .SATURDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 69 to 79. Lows 36 to 46. $$ IDZ052-053-191000- Arco/Mud Lake Desert-Upper Snake River Plain- Including Mud Lake, INL, Craters of the Moon NM, Idaho Falls, Rexburg, and St. Anthony 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly clear. Colder. Lows 24 to 32. Northeast winds 10 to 15 mph. .TUESDAY...Sunny. Highs 56 to 64. East winds up to 10 mph... shifting to southwest in the afternoon. .TUESDAY NIGHT...Partly cloudy. Lows 29 to 37. Southwest winds 10 to 15 mph. .WEDNESDAY...Mostly sunny. Highs 60 to 67. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Lows 35 to 42. North winds 10 to 15 mph. Chance of precipitation 50 percent. .THURSDAY...Partly sunny. Highs 55 to 63. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 33 to 43. Highs 66 to 75. .SATURDAY...Sunny. Highs 72 to 80. .SATURDAY NIGHT...Partly cloudy. Lows 39 to 48. .SUNDAY...Sunny. Highs 75 to 83. .SUNDAY NIGHT...Partly cloudy. Lows 41 to 50. .MEMORIAL DAY...Sunny. Highs 76 to 83. $$ IDZ051-191000- Shoshone/Lava Beds- Including Shoshone, Richfield, and Carey 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly cloudy in the evening then clearing. Lows 28 to 36. Northwest winds 10 to 15 mph...shifting to northeast after midnight. .TUESDAY...Sunny. Highs 60 to 67. East winds up to 10 mph... shifting to southwest in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 32 to 39. West winds 10 to 15 mph...decreasing to up to 10 mph after midnight. .WEDNESDAY...Mostly sunny. Highs 64 to 71. Southwest winds up to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows 37 to 44. West winds 10 to 15 mph. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 61 to 70. Lows 35 to 43. .FRIDAY...Mostly sunny. Highs 71 to 78. .FRIDAY NIGHT THROUGH MEMORIAL DAY...Mostly clear. Lows 39 to 49. Highs 76 to 84. $$ IDZ056-057-191000- Southern Hills/Albion Mountains-Raft River Region- Including Albion, Almo, Malta, Rockland, and Holbrook 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 28 to 37. North winds 10 to 15 mph...decreasing to up to 10 mph after midnight. .TUESDAY...Sunny. Highs 58 to 65. Light and variable winds... becoming northwest around 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 34 to 44. West winds around 10 mph...shifting to south up to 10 mph after midnight. .WEDNESDAY...Sunny. Highs 64 to 71. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows 38 to 47. West winds around 10 mph. .THURSDAY...Partly sunny. Highs 60 to 67. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 37 to 47. Highs 70 to 77. .FRIDAY NIGHT...Mostly clear. Lows 42 to 52. .SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 75 to 83. Lows 44 to 54. .SUNDAY...Sunny. Highs 76 to 85. .SUNDAY NIGHT...Partly cloudy. Lows 46 to 56. .MEMORIAL DAY...Sunny. Highs 77 to 86. $$ IDZ058-059-191000- Marsh and Arbon Highlands-Franklin/Eastern Oneida Region- Including Inkom, McCammon, Downey, Lava Hot Springs, Malad, Preston, and Thatcher 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 24 to 34. .TUESDAY...Sunny. Highs 54 to 64. .TUESDAY NIGHT...Partly cloudy. Lows 30 to 40. .WEDNESDAY...Sunny. Highs 58 to 68. .WEDNESDAY NIGHT...Mostly cloudy. Lows 35 to 45. .THURSDAY...Mostly cloudy with a slight chance of rain showers. Highs 54 to 64. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 32 to 42. Highs 65 to 74. .FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 40 to 50. Highs 71 to 81. .MEMORIAL DAY...Sunny. Highs 74 to 83. $$ IDZ054-191000- Lower Snake River Plain- Including Pocatello, Blackfoot, American Falls, Shelley, and Fort Hall 1202 PM MDT Mon May 18 2026 ...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR AMERICAN FALLS RESERVOIR... .TONIGHT...Mostly clear. Colder. Lows 24 to 34. North winds 10 to 15 mph...shifting to northeast after midnight. .TUESDAY...Sunny. Highs 59 to 66. Northeast winds up to 10 mph... shifting to southwest around 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 29 to 39. Southwest winds 10 to 15 mph. .WEDNESDAY...Sunny. Highs 63 to 70. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers. Lows 37 to 44. West winds 10 to 15 mph. Chance of precipitation 20 percent. .THURSDAY...Partly sunny. Highs 59 to 66. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 35 to 45. Highs 69 to 76. .SATURDAY...Sunny. Highs 73 to 80. .SATURDAY NIGHT...Partly cloudy. Lows 40 to 49. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 74 to 83. Lows 41 to 51. $$ IDZ075-191000- Wood River Foothills- Including Hailey, Bellevue, and Picabo 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly cloudy in the evening then clearing. Lows 29 to 36. North winds up to 10 mph. .TUESDAY...Sunny. Highs 53 to 63. Southeast winds up to 10 mph... shifting to southwest in the afternoon. .TUESDAY NIGHT...Partly cloudy. Lows 31 to 39. West winds 10 to 15 mph...shifting to north after midnight. .WEDNESDAY...Mostly sunny. Highs 57 to 67. West winds 10 to 15 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 33 to 42. Northwest winds 10 to 15 mph. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 55 to 65. Lows 35 to 44. .FRIDAY...Mostly sunny. Highs 65 to 75. .FRIDAY NIGHT THROUGH MEMORIAL DAY...Mostly clear. Lows 40 to 50. Highs 70 to 80. $$ IDZ069-191000- Lost River Range- Including Borah Peak 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 28 to 35. .TUESDAY...Mostly sunny. A slight chance of through the day. Highs 51 to 61. .TUESDAY NIGHT...Mostly cloudy in the evening then clearing. Lows 32 to 39. .WEDNESDAY...Mostly sunny. Highs 54 to 64. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers, snow showers and a slight chance of thunderstorms. Lows 34 to 41. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 51 to 61. Lows 34 to 41. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 61 to 71. Lows 38 to 45. .SATURDAY...Sunny. Highs 66 to 76. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 41 to 49. Highs 69 to 79. .MEMORIAL DAY...Sunny, breezy. Highs 69 to 79. $$ IDZ063-064-191000- Caribou Range-Big Hole Mountains- Including Wayan, Swan Valley, and Victor 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Colder. Lows 22 to 32. .TUESDAY...Sunny. Not as cool. Highs 52 to 59. .TUESDAY NIGHT...Partly cloudy. Lows 27 to 37. .WEDNESDAY...Mostly sunny. Highs 57 to 64. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers and snow showers. Lows 32 to 39. .THURSDAY...Mostly cloudy with a chance of rain showers, snow showers and a slight chance of thunderstorms. Highs 50 to 57. .THURSDAY NIGHT...Partly cloudy. Lows 30 to 38. .FRIDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs 62 to 69. .FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 35 to 45. Highs 69 to 79. .SUNDAY NIGHT AND MEMORIAL DAY...Mostly clear. Lows 37 to 47. Highs 73 to 82. $$ IDZ068-070-191000- Lost River Valley-Challis/Pahsimeroi Valleys- Including Howe, Arco, Mackay, Chilly, and Challis 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 27 to 34. North winds around 10 mph in the evening...becoming light and variable. .TUESDAY...Mostly sunny. A slight chance of through the day. Highs 54 to 64. Light and variable winds...becoming southwest around 10 mph in the afternoon. .TUESDAY NIGHT...Mostly cloudy in the evening then clearing. Lows 31 to 38. West winds around 10 mph in the evening...becoming light and variable. .WEDNESDAY...Partly sunny. Highs 56 to 66. West winds up to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows 32 to 39. Northwest winds 10 to 15 mph. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 54 to 64. Lows 33 to 40. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 64 to 74. Lows 37 to 44. .SATURDAY...Sunny. Highs 68 to 78. .SATURDAY NIGHT...Partly cloudy. Lows 39 to 46. .SUNDAY...Sunny. Highs 70 to 80. .SUNDAY NIGHT...Partly cloudy. Lows 41 to 48. .MEMORIAL DAY...Sunny. Highs 71 to 81. $$ IDZ066-067-191000- Centennial Mountains - Island Park-Beaverhead - Lemhi Highlands- Including Island Park, Kilgore, Dubois, Spencer, Edie School, and Small 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly clear. Lows 24 to 32. .TUESDAY...Mostly sunny. A slight chance of through the day. Highs 51 to 59. .TUESDAY NIGHT...Mostly cloudy. A slight chance of snow showers in the evening. Lows 27 to 37. .WEDNESDAY...Partly sunny. Highs 54 to 62. .WEDNESDAY NIGHT...Cloudy with a chance of rain showers, snow showers and a slight chance of thunderstorms. Lows 29 to 39. .THURSDAY...Partly sunny with a chance of rain showers. Highs 49 to 58. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 31 to 41. Highs 61 to 68. .SATURDAY THROUGH SUNDAY NIGHT...Partly cloudy. Highs 68 to 78. Lows 36 to 46. .MEMORIAL DAY...Sunny. Highs 72 to 79. $$ IDZ065-191000- Teton Valley- Including Ashton, Tetonia, and Driggs 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly clear. Colder. Lows 22 to 29. .TUESDAY...Sunny. Highs 54 to 61. .TUESDAY NIGHT...Mostly cloudy in the evening then clearing. Lows 28 to 35. .WEDNESDAY...Mostly sunny. Highs 58 to 65. .WEDNESDAY NIGHT...Cloudy with a slight chance of showers and thunderstorms. Lows 31 to 39. .THURSDAY...Mostly cloudy with a chance of rain showers. Highs 52 to 59. .THURSDAY NIGHT...Partly cloudy. Lows 30 to 37. .FRIDAY...Mostly sunny with a slight chance of rain. Highs around 67. .FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 37 to 47. Highs 69 to 79. .MEMORIAL DAY...Sunny. Highs 75 to 82. $$ IDZ062-191000- Blackfoot Mountains- Including Grace,Soda Springs, Henry, and Bone 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly clear. Colder. Lows 22 to 32. .TUESDAY...Sunny. Highs 52 to 59. .TUESDAY NIGHT...Mostly clear. Lows 28 to 38. .WEDNESDAY...Mostly sunny. Highs 56 to 64. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers. Lows 33 to 43. .THURSDAY...Mostly cloudy with a slight chance of rain showers. Highs 51 to 59. .THURSDAY NIGHT THROUGH SATURDAY...Partly cloudy. Lows 33 to 43. Highs 63 to 73. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows 38 to 48. Highs 68 to 78. .SUNDAY NIGHT AND MEMORIAL DAY...Mostly clear. Lows 40 to 50. Highs 70 to 80. $$ IDZ060-191000- Bear River Range- Including Emigration Summit 1202 PM MDT Mon May 18 2026 .TONIGHT...Decreasing clouds. Lows 28 to 35. .TUESDAY...Mostly sunny. Not as cool. Highs 50 to 57. .TUESDAY NIGHT...Partly cloudy. Lows 36 to 43. .WEDNESDAY...Mostly sunny. Highs 55 to 62. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers. Lows 41 to 48. .THURSDAY...Mostly cloudy with a slight chance of rain showers, thunderstorms and snow showers. Highs 50 to 57. .THURSDAY NIGHT...Partly cloudy. Lows 37 to 44. .FRIDAY...Mostly sunny with a slight chance of rain. Highs 62 to 69. .FRIDAY NIGHT...Mostly clear. Lows 43 to 50. .SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 67 to 74. Lows 46 to 53. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 70 to 79. Lows 48 to 55. $$ IDZ061-191000- Bear Lake Valley- Including St. Charles, Montpelier, and Georgetown 1202 PM MDT Mon May 18 2026 .TONIGHT...Mostly cloudy with isolated rain showers in the evening...then partly cloudy after midnight. Colder. Lows 22 to 32. .TUESDAY...Mostly sunny. Not as cool. Highs 50 to 57. .TUESDAY NIGHT...Mostly clear. Lows 26 to 36. .WEDNESDAY...Mostly sunny. Not as cool. Highs 56 to 63. .WEDNESDAY NIGHT...Mostly cloudy. Lows 32 to 41. .THURSDAY...Mostly cloudy with a slight chance of showers and thunderstorms. Highs 51 to 58. .THURSDAY NIGHT...Mostly clear. Lows 29 to 38. .FRIDAY...Mostly sunny. Highs 62 to 69. .FRIDAY NIGHT AND SATURDAY...Mostly clear. Lows 34 to 43. Highs 66 to 75. .SATURDAY NIGHT...Partly cloudy. Lows 37 to 45. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 70 to 80. Lows 38 to 47. $$ IDZ071-074-191000- Frank Church Wilderness-Big Lost Highlands/Copper Basin- Including Clayton and Copper Basin 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 25 to 33. .TUESDAY...Increasing clouds. A slight chance of. Highs 51 to 61. .TUESDAY NIGHT...Mostly cloudy in the evening then clearing. Lows 27 to 36. .WEDNESDAY...Partly sunny. Highs 52 to 62. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers and snow showers. Lows 28 to 37. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 52 to 62. Lows 30 to 40. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 61 to 71. Lows 33 to 43. .SATURDAY...Sunny. Highs 65 to 75. .SATURDAY NIGHT...Partly cloudy. Lows 36 to 46. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Breezy. Highs 67 to 77. Lows 37 to 47. $$ IDZ055-191000- Eastern Magic Valley- Including Burley, Rupert, Heyburn, and Oakley 1202 PM MDT Mon May 18 2026 .TONIGHT...Partly cloudy. Lows 28 to 38. North winds 10 to 15 mph...shifting to east after midnight. .TUESDAY...Sunny. Highs 61 to 68. East winds up to 10 mph... shifting to west around 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 34 to 44. West winds 10 to 15 mph...shifting to south after midnight. .WEDNESDAY...Sunny. Highs 65 to 72. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows 38 to 48. West winds 10 to 15 mph. .THURSDAY...Partly sunny. Highs 61 to 68. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 36 to 46. Highs 71 to 78..FRIDAY NIGHT THROUGH MEMORIAL DAY...Mostly clear. Lows 43 to 53. Highs 76 to 85. $$ weather information on-line 24-hours a day www.weather.gov/pocatello