FPUS55 KPIH 181057 ZFPPIH Zone Forecast Product FOR Idaho National Weather Service Pocatello ID 457 AM 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. IDZ072-182200- Sawtooth/Stanley Basin- Including Stanley 457 AM MDT Mon May 18 2026 .TODAY...Sunny. Not as cool. Highs 47 to 57. .TONIGHT...Mostly clear. Lows 23 to 33. .TUESDAY...Mostly sunny. A slight chance of snow showers in the afternoon. Highs 51 to 61. .TUESDAY NIGHT...Mostly clear. Lows 26 to 36. .WEDNESDAY...Mostly sunny. Highs 55 to 65. .WEDNESDAY NIGHT...Partly cloudy. Lows 29 to 39. .THURSDAY...Sunny. Highs 59 to 69. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 31 to 41. Highs 62 to 72. .SATURDAY THROUGH SUNDAY...Mostly clear. Highs 67 to 77. Lows 34 to 44. $$ IDZ073-182200- Sun Valley Region- Including Ketchum, Sun Valley, and Galena 457 AM MDT Mon May 18 2026 .TODAY...Sunny, breezy. Highs 49 to 59. .TONIGHT...Partly cloudy. Lows 26 to 34. .TUESDAY...Partly sunny. A slight chance of snow showers in the afternoon. Highs 52 to 62. .TUESDAY NIGHT...Mostly clear. Lows 28 to 37. .WEDNESDAY...Mostly sunny. Highs 58 to 68. .WEDNESDAY NIGHT...Partly cloudy. Lows 31 to 41. .THURSDAY...Sunny. Highs 61 to 71. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 34 to 44. Highs 64 to 74. .SATURDAY THROUGH SUNDAY...Mostly clear. Highs 69 to 79. Lows 36 to 46. $$ IDZ053-182200- Upper Snake River Plain- Including Idaho Falls, Rexburg, and St. Anthony 457 AM MDT Mon May 18 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... .TODAY...Partly sunny. Windy. Highs 49 to 57. North winds 20 to 30 mph. .TONIGHT...Mostly clear. Lows 25 to 32. Northeast winds 10 to 15 mph. .TUESDAY...Sunny. Not as cool. Highs 56 to 64. Southeast winds up to 10 mph...shifting to southwest in the afternoon. .TUESDAY NIGHT...Partly cloudy. Lows 32 to 39. South winds 10 to 15 mph. .WEDNESDAY...Sunny. Highs 60 to 68. Southwest winds 10 to 15 mph. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Lows 34 to 42. .THURSDAY...Mostly sunny with a slight chance of rain showers. Highs 60 to 68. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 34 to 44. Highs 65 to 73. .SATURDAY...Sunny. Highs 71 to 78. .SATURDAY NIGHT...Partly cloudy. Lows 39 to 48. .SUNDAY...Sunny. Highs 74 to 81. $$ IDZ052-182200- Arco/Mud Lake Desert- Including Mud Lake, INL, and Craters of the Moon NM 457 AM MDT Mon May 18 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... .TODAY...Mostly sunny. Windy. Highs 53 to 60. North winds 20 to 30 mph. .TONIGHT...Mostly clear. Lows 25 to 34. Northeast winds 10 to 15 mph. .TUESDAY...Mostly sunny. Highs 59 to 66. Northeast winds up to 10 mph...shifting to southwest in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 30 to 37. Southwest winds 10 to 15 mph. .WEDNESDAY...Sunny. Highs 64 to 71. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Lows 34 to 41. .THURSDAY THROUGH FRIDAY NIGHT...Partly cloudy. Highs 65 to 75. Lows 35 to 44. .SATURDAY...Sunny. Highs 74 to 81. .SATURDAY NIGHT...Partly cloudy. Lows 39 to 47. .SUNDAY...Sunny. Highs 77 to 84. $$ IDZ051-182200- Shoshone/Lava Beds- Including Shoshone, Richfield, and Carey 457 AM MDT Mon May 18 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... .TODAY...Sunny. Highs 56 to 63. North winds 10 to 15 mph. .TONIGHT...Mostly cloudy with isolated rain showers in the evening...then mostly clear after midnight. Lows 29 to 36. Northwest winds 10 to 15 mph...shifting to northeast after midnight. Chance of precipitation 20 percent. .TUESDAY...Sunny. Highs 61 to 68. East winds up to 10 mph... shifting to southwest in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 32 to 39. West winds around 10 mph. .WEDNESDAY...Mostly sunny. Highs 66 to 73. Southwest winds up to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 36 to 43. .THURSDAY...Sunny. Highs 67 to 74. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 37 to 45. Highs 71 to 78. .FRIDAY NIGHT THROUGH SUNDAY...Mostly clear. Lows 39 to 48. Highs 76 to 84. $$ IDZ056-057-182200- Southern Hills/Albion Mountains-Raft River Region- Including Albion, Almo, Malta, Rockland, and Holbrook 457 AM MDT Mon May 18 2026 .TODAY...Mostly sunny. Windy. Highs 54 to 61. North winds 20 to 30 mph. .TONIGHT...Partly cloudy. Lows 29 to 38. North winds 10 to 15 mph...decreasing to up to 10 mph after midnight. .TUESDAY...Mostly sunny. Highs 59 to 66. Light and variable winds...becoming northwest around 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 33 to 43. Southwest winds around 10 mph. .WEDNESDAY...Sunny, warmer. Highs 65 to 72. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy. Lows 39 to 49. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 66 to 73. Lows 40 to 50. .FRIDAY...Mostly sunny. Highs 70 to 77. .FRIDAY NIGHT...Mostly clear. Lows 42 to 52. .SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 75 to 83. Lows 44 to 54. .SUNDAY...Sunny. Highs 76 to 85. $$ IDZ058-059-182200- Marsh and Arbon Highlands-Franklin/Eastern Oneida Region- Including Inkom, McCammon, Downey, Lava Hot Springs, Malad, Preston, and Thatcher 457 AM MDT Mon May 18 2026 .TODAY...Decreasing clouds. Windy. Highs 48 to 58. North winds around 30 mph in the morning. .TONIGHT...Mostly clear. Colder. Lows 24 to 34. .TUESDAY...Sunny. Not as cool. Highs 54 to 64. .TUESDAY NIGHT...Mostly clear. Lows 29 to 39. .WEDNESDAY...Sunny, warmer. Highs 60 to 70. .WEDNESDAY NIGHT...Mostly cloudy. Lows 34 to 44. .THURSDAY...Mostly sunny with a slight chance of rain showers. Highs 60 to 70. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 36 to 46. Highs 65 to 74. .SATURDAY THROUGH SUNDAY...Partly cloudy. Highs 71 to 81. Lows 40 to 50. $$ IDZ054-182200- Lower Snake River Plain- Including Pocatello, Blackfoot, American Falls, Shelley, and Fort Hall 457 AM MDT Mon May 18 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... ...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR AMERICAN FALLS RESERVOIR... .TODAY...Partly sunny in the morning then clearing. Windy. Highs 54 to 61. North winds 20 to 30 mph. .TONIGHT...Mostly clear. Lows 26 to 35. North winds 10 to 15 mph...shifting to northeast after midnight. .TUESDAY...Sunny. Highs 59 to 66. Northeast winds up to 10 mph... shifting to southwest around 10 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 30 to 39. Southwest winds around 10 mph. .WEDNESDAY...Sunny. Highs 63 to 71. Southwest winds around 10 mph. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers. Lows 35 to 44. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 63 to 71. Lows 35 to 44. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 69 to 76. Lows 37 to 46. .SATURDAY...Sunny. Highs 73 to 80. .SATURDAY NIGHT...Partly cloudy. Lows 40 to 49. .SUNDAY...Sunny. Highs 74 to 82. $$ IDZ075-182200- Wood River Foothills- Including Hailey, Bellevue, and Picabo 457 AM MDT Mon May 18 2026 .TODAY...Sunny. Highs 50 to 60. North winds 10 to 15 mph. .TONIGHT...Partly cloudy. Isolated rain showers in the evening. Lows 29 to 37. North winds up to 10 mph. .TUESDAY...Mostly sunny. Highs 54 to 64. Southeast winds up to 10 mph...shifting to southwest in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 32 to 40. Northwest winds around 10 mph. .WEDNESDAY...Mostly sunny. Warmer. Highs 59 to 69. West winds 10 to 15 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 35 to 44. .THURSDAY...Sunny. Highs 62 to 72. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 37 to 46. Highs 65 to 75. .FRIDAY NIGHT THROUGH SUNDAY...Mostly clear. Lows 39 to 49. Highs 70 to 80. $$ IDZ069-182200- Lost River Range- Including Borah Peak 457 AM MDT Mon May 18 2026 .TODAY...Sunny, windy. Highs 46 to 56. North winds around 30 mph in the morning. .TONIGHT...Mostly clear. Lows 27 to 34. .TUESDAY...Mostly sunny. A slight chance of snow showers in the afternoon. Highs 50 to 60. .TUESDAY NIGHT...Partly cloudy. Lows 32 to 39. .WEDNESDAY...Mostly sunny. Highs 55 to 65. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers, snow showers and a slight chance of thunderstorms. Lows 36 to 43. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 57 to 67. Lows 37 to 44. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 61 to 71. Lows 38 to 45. .SATURDAY...Sunny. Highs 66 to 76. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows 41 to 48. Highs 69 to 79. $$ IDZ063-064-182200- Caribou Range-Big Hole Mountains- Including Wayan, Swan Valley, and Victor 457 AM MDT Mon May 18 2026 .TODAY...Mostly cloudy. Scattered snow showers in the morning... then isolated thunderstorms and snow showers in the afternoon. Snow accumulation up to 1 inch. Highs 46 to 53. .TONIGHT...Partly cloudy. Colder. Lows 23 to 32. .TUESDAY...Mostly sunny. Not as cool. Highs 53 to 60. .TUESDAY NIGHT...Mostly clear. Lows 27 to 36. .WEDNESDAY...Sunny. Highs 58 to 65. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers and snow showers. Lows 32 to 40. .THURSDAY...Partly sunny with a chance of rain showers, snow showers and a slight chance of thunderstorms. Highs 58 to 65. .THURSDAY NIGHT...Partly cloudy. Lows 32 to 40. .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. $$ IDZ068-070-182200- Lost River Valley-Challis/Pahsimeroi Valleys- Including Howe, Arco, Mackay, Chilly, and Challis 457 AM MDT Mon May 18 2026 .TODAY...Sunny, breezy. Highs 48 to 58. North winds 15 to 25 mph...decreasing to 10 to 15 mph in the afternoon. .TONIGHT...Mostly clear. Lows 27 to 34. North winds around 10 mph in the evening...becoming light and variable. .TUESDAY...Mostly sunny. A slight chance of rain showers and snow showers in the afternoon. Highs 54 to 64. Light and variable winds...becoming southwest around 10 mph in the afternoon. .TUESDAY NIGHT...Partly cloudy. Lows 31 to 38. West winds up to 10 mph. .WEDNESDAY...Mostly sunny. Highs 58 to 68. West winds up to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows 35 to 42. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 59 to 69. Lows 36 to 43. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 64 to 74. Lows 37 to 44. .SATURDAY...Sunny. Highs 68 to 78. .SATURDAY NIGHT...Partly cloudy. Lows 39 to 46. .SUNDAY...Sunny. Highs 70 to 80. $$ IDZ066-067-182200- Centennial Mountains - Island Park-Beaverhead - Lemhi Highlands- Including Island Park, Kilgore, Dubois, Spencer, Edie School, and Small 457 AM MDT Mon May 18 2026 .TODAY...Mostly sunny. Windy. Highs 44 to 53. North winds around 30 mph in the morning. .TONIGHT...Mostly clear. Lows 22 to 32. .TUESDAY...Sunny in the morning...then partly sunny with a slight chance of rain showers and snow showers in the afternoon. Not as cool. Highs 52 to 60. .TUESDAY NIGHT...Partly cloudy. Lows 28 to 38. .WEDNESDAY...Mostly sunny. Highs 56 to 64. .WEDNESDAY NIGHT...Mostly cloudy with a chance of rain showers, snow showers and a slight chance of thunderstorms. Lows 31 to 41. .THURSDAY...Mostly sunny with a chance of rain showers. Highs 56 to 64. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 32 to 42. Highs 61 to 68. .SATURDAY THROUGH SUNDAY...Partly cloudy. Highs 68 to 78. Lows 35 to 45. $$ IDZ065-182200- Teton Valley- Including Ashton, Tetonia, and Driggs 457 AM MDT Mon May 18 2026 .TODAY...Partly sunny. Breezy. Highs 47 to 54. .TONIGHT...Mostly clear. Lows 22 to 29. .TUESDAY...Sunny. Not as cool. Highs around 58. .TUESDAY NIGHT...Partly cloudy. Lows 29 to 36. .WEDNESDAY...Sunny. Highs 59 to 66. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows 33 to 40. .THURSDAY...Mostly sunny with a chance of rain showers. Highs 59 to 66. .THURSDAY NIGHT...Partly cloudy. Lows 33 to 40. .FRIDAY...Mostly sunny with a slight chance of rain. Highs around 67. .FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 36 to 46. Highs 69 to 79. $$ IDZ062-182200- Blackfoot Mountains- Including Grace, Soda Springs, Henry, and Bone 457 AM MDT Mon May 18 2026 .TODAY...Decreasing clouds. Windy. Highs 46 to 54. North winds around 30 mph in the morning. .TONIGHT...Mostly clear. Colder. Lows 22 to 32. .TUESDAY...Sunny. Not as cool. Highs 52 to 60. .TUESDAY NIGHT...Mostly clear. Lows 28 to 38. .WEDNESDAY...Sunny. Highs 57 to 66. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers. Lows 33 to 43. .THURSDAY...Mostly sunny with a slight chance of rain showers. Highs 56 to 65. .THURSDAY NIGHT THROUGH SATURDAY NIGHT...Partly cloudy. Lows 36 to 46. Highs 63 to 73. .SUNDAY...Mostly sunny. Highs 68 to 78. $$ IDZ060-182200- Bear River Range- Including Emigration Summit 457 AM MDT Mon May 18 2026 .TODAY...Mostly cloudy. Scattered snow showers in the morning... then isolated thunderstorms and snow showers in the afternoon. Breezy. Little or no snow accumulation. Highs 44 to 51. .TONIGHT...Partly cloudy. Colder. Lows 27 to 34. .TUESDAY...Mostly sunny. Not as cool. Highs 51 to 58. .TUESDAY NIGHT...Mostly clear. Lows 33 to 40. .WEDNESDAY...Sunny. Highs 56 to 63. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of rain showers. Lows 40 to 47. .THURSDAY...Mostly sunny with a slight chance of rain showers, thunderstorms and snow showers. Highs 57 to 64. .THURSDAY NIGHT...Partly cloudy. Lows 40 to 47. .FRIDAY...Mostly sunny with a slight chance of rain. Highs 62 to 69. .FRIDAY NIGHT...Mostly clear. Lows 43 to 50. .SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 67 to 74. Lows 46 to 53. .SUNDAY...Sunny. Highs 70 to 77. $$ IDZ061-182200- Bear Lake Valley- Including St. Charles, Montpelier, and Georgetown 457 AM MDT Mon May 18 2026 .TODAY...Cloudy. Scattered snow showers in the morning...then scattered rain showers, snow showers and isolated thunderstorms in the afternoon. Snow accumulation up to 1 inch. Highs 44 to 51. .TONIGHT...Mostly cloudy with isolated rain showers in the evening...then partly cloudy after midnight. Lows 22 to 32. .TUESDAY...Mostly sunny. Not as cool. Highs 51 to 58. .TUESDAY NIGHT...Mostly clear. Lows 26 to 35. .WEDNESDAY...Sunny. Not as cool. Highs 57 to 64. .WEDNESDAY NIGHT...Mostly cloudy. Lows 31 to 40. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs 58 to 65. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 31 to 41. 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...Sunny. Highs 68 to 78. $$ IDZ071-074-182200- Frank Church Wilderness-Big Lost Highlands/Copper Basin- Including Clayton and Copper Basin 457 AM MDT Mon May 18 2026 .TODAY...Sunny, breezy. Not as cool. Highs 46 to 56. .TONIGHT...Mostly clear. Lows 24 to 33. .TUESDAY...Partly sunny. A slight chance of snow showers in the afternoon. Highs 51 to 61. .TUESDAY NIGHT...Partly cloudy. Lows 27 to 36. .WEDNESDAY...Mostly sunny. Highs 55 to 65. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of rain showers and snow showers. Lows 30 to 40. .THURSDAY THROUGH FRIDAY NIGHT...Partly cloudy. Highs 60 to 70. Lows 33 to 43. .SATURDAY...Sunny. Highs 65 to 75. .SATURDAY NIGHT...Partly cloudy. Lows 36 to 46. .SUNDAY...Sunny. Highs 67 to 77. $$ IDZ055-182200- Eastern Magic Valley- Including Burley, Rupert, Heyburn, and Oakley 457 AM MDT Mon May 18 2026 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING... .TODAY...Mostly sunny. Breezy. Highs 56 to 63. North winds 15 to 25 mph...decreasing to 10 to 15 mph in the afternoon. .TONIGHT...Mostly cloudy with isolated rain showers in the evening...then mostly clear after midnight. Lows 29 to 38. North winds 10 to 15 mph...shifting to east after midnight. Chance of precipitation 20 percent. .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 33 to 43. Southwest winds around 10 mph. .WEDNESDAY...Sunny. Highs 66 to 73. Southwest winds around 10 mph. .WEDNESDAY NIGHT THROUGH FRIDAY...Partly cloudy. Lows 39 to 49. Highs 68 to 78. .FRIDAY NIGHT THROUGH SUNDAY...Mostly clear. Lows 42 to 52. Highs 76 to 84. $$ weather information on-line 24-hours a day www.weather.gov/pocatello