FPUS55 KBOI 180637 ZFPBOI Zone Forecasts for Southwest Idaho/Southeast Oregon National Weather Service Boise ID 1236 AM MDT Mon May 18 2026 Forecast Updated. Spot temperatures are for .SUNDAY THROUGH SUNDAY..., Monday, Monday night, and Tuesday. IDZ011-181400- West Central Mountains- 1236 AM MDT Mon May 18 2026 .TODAY...Patchy fog. Mostly sunny, then a slight chance of snow showers this afternoon. Chance of snow 20 percent. Highs 48 to 62. .TONIGHT...Decreasing clouds. Patchy fog after midnight. Lows 28 to 38. .TUESDAY...Patchy fog in the morning. Sunny. Highs 52 to 66. .TUESDAY NIGHT...Decreasing clouds. Lows 33 to 43. .WEDNESDAY...Mostly sunny. Highs 55 to 69. .WEDNESDAY NIGHT...Partly cloudy. Areas of fog after midnight. Lows 34 to 44. .THURSDAY...Areas of fog in the morning. Sunny. Highs 59 to 73. .THURSDAY NIGHT...Partly cloudy. Lows 36 to 47. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 62 to 77. Lows 38 to 48. .SATURDAY NIGHT...Increasing clouds. Lows 39 to 49. .SUNDAY...Sunny. Highs 65 to 79. && TEMPERATURE McCall 26 56 29 60 $$ = IDZ013-181400- Boise Mountains- 1236 AM MDT Mon May 18 2026 .TODAY...Increasing clouds. Highs 51 to 66. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 24 to 39. .TUESDAY...Sunny. Highs 54 to 68. .TUESDAY NIGHT...Mostly clear. Lows 28 to 43. .WEDNESDAY...Mostly sunny. Highs 58 to 72. .WEDNESDAY NIGHT AND THURSDAY...Mostly clear. Patchy fog through the day. Lows 30 to 45. Highs 62 to 77. .THURSDAY NIGHT...Increasing clouds. Lows 33 to 48. .FRIDAY THROUGH SUNDAY...Mostly clear. Highs 67 to 82. Lows 35 to 50. && TEMPERATURE Idaho City 26 65 29 67 $$ = IDZ028-181400- Camas Prairie- 1236 AM MDT Mon May 18 2026 .TODAY...Increasing clouds. Highs 56 to 61. Breezy. Northwest winds 10 to 20 mph with gusts to 35 mph after midnight, becoming north 10 to 15 mph with gusts to 25 mph. .TONIGHT...Mostly cloudy in the evening, then clearing. Lows 27 to 32. Northwest winds 10 to 15 mph with gusts to 25 mph in the evening, becoming light after midnight. .TUESDAY...Mostly sunny. Highs 60 to 65. Light winds in the morning, becoming southwest 10 to 15 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 30 to 35. West winds 10 to 15 mph in the evening, becoming light after midnight. .WEDNESDAY...Mostly sunny. Highs 64 to 69. Breezy. Light winds in the morning, becoming west 10 to 20 mph in the afternoon. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows 32 to 37. Breezy. .THURSDAY...Sunny. Highs 68 to 73. .THURSDAY NIGHT...Partly cloudy. Lows 35 to 40. .FRIDAY THROUGH SUNDAY...Mostly clear. Highs 71 to 81. Lows 36 to 43. Breezy. && TEMPERATURE Fairfield 25 58 27 62 $$ = IDZ033-181400- Upper Weiser River- 1236 AM MDT Mon May 18 2026 .TODAY...Mostly clear. Highs 62 to 68. North winds 10 to 15 mph. Gusts to 30 mph after midnight, then 25 mph this afternoon. .TONIGHT...Partly cloudy. Lows 37 to 42. North winds 10 to 15 mph. Gusts to 25 mph in the evening. .TUESDAY...Sunny. Highs 65 to 71. Light winds. .TUESDAY NIGHT...Mostly clear. Lows 42 to 47. Light winds. .WEDNESDAY...Mostly sunny. Highs 68 to 74. Light winds. .WEDNESDAY NIGHT AND THURSDAY...Mostly clear. Lows 43 to 48. Highs 72 to 79. .THURSDAY NIGHT...Partly cloudy. Lows 45 to 50. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 74 to 84. Lows 46 to 51. .SATURDAY NIGHT...Increasing clouds. Lows 47 to 52. .SUNDAY...Sunny. Highs 78 to 84. && TEMPERATURE Council 34 67 39 70 Cambridge 34 68 37 71 $$ = ORZ064-181400- Oregon Lower Treasure Valley- 1236 AM MDT Mon May 18 2026 /1136PM PDT Sun May 17 2026/ .TODAY...Mostly clear. Highs 67 to 72. Northwest winds 10 to 15 mph with gusts to 25 mph. .TONIGHT...Decreasing clouds. Lows 40 to 45. Northwest winds 10 to 15 mph. Gusts to 25 mph in the evening. .TUESDAY...Sunny. Highs 71 to 76. Light winds. .TUESDAY NIGHT...Increasing clouds. Lows 45 to 50. Light winds. .WEDNESDAY...Mostly sunny. Highs 74 to 79. Light winds. .WEDNESDAY NIGHT...Partly cloudy. Lows 47 to 52. .THURSDAY THROUGH FRIDAY NIGHT...Mostly clear. Highs 77 to 84. Lows 49 to 54. .SATURDAY...Sunny. Highs 83 to 88. .SATURDAY NIGHT...Increasing clouds. Lows 51 to 56. .SUNDAY...Sunny. Highs 83 to 88. && TEMPERATURE Ontario 39 71 41 74 $$ = IDZ012-181400- Lower Treasure Valley- 1236 AM MDT Mon May 18 2026 .TODAY...Increasing clouds. Highs 66 to 71. Breezy. Northwest winds 10 to 20 mph with gusts to 35 mph. .TONIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows 39 to 44. Northwest winds 10 to 15 mph. Gusts to 25 mph in the evening. .TUESDAY...Sunny. Highs 70 to 75. Light winds. .TUESDAY NIGHT...Mostly clear. Lows 43 to 48. East winds up to 10 mph. .WEDNESDAY...Mostly sunny. Highs 74 to 79. Light winds in the morning, becoming northwest up to 10 mph in the afternoon. .WEDNESDAY NIGHT THROUGH SUNDAY...Mostly clear. Lows 45 to 55. Highs 77 to 87. && TEMPERATURE Caldwell 38 69 40 73 $$ = IDZ014-181400- Upper Treasure Valley- 1236 AM MDT Mon May 18 2026 .TODAY...Mostly clear. Patchy blowing dust. Highs 65 to 70. Windy. Northwest winds 15 to 25 mph with gusts to 45 mph. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 36 to 41. Breezy. Northwest winds 10 to 20 mph with gusts to 30 mph in the evening, decreasing to around 10 mph after midnight. .TUESDAY...Sunny. Highs 69 to 74. Northwest winds up to 10 mph. Gusts to 20 mph in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows 40 to 46. North winds around 10 mph with gusts to 20 mph in the evening, becoming light after midnight. .WEDNESDAY...Mostly sunny. Highs 74 to 79. Light winds in the morning, becoming northwest around 10 mph in the afternoon. Gusts to 20 mph. .WEDNESDAY NIGHT...Decreasing clouds. Lows 43 to 48. .THURSDAY THROUGH FRIDAY NIGHT...Mostly clear. Highs 76 to 84. Lows 45 to 50. .SATURDAY THROUGH SUNDAY...Mostly clear. Highs 84 to 89. Lows 48 to 53. && TEMPERATURE Boise 38 68 41 71 Mountain Home 36 68 37 72 $$ = IDZ016-181400- Western Magic Valley- 1236 AM MDT Mon May 18 2026 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT MONDAY... .TODAY...Mostly clear. Patchy frost. Highs 61 to 66. West winds 10 to 15 mph with gusts to 25 mph. .TONIGHT...Partly cloudy. Lows 34 to 39. West winds 10 to 15 mph with gusts to 25 mph in the evening, shifting to southeast after midnight. .TUESDAY...Sunny. Highs 65 to 70. South winds around 10 mph in the morning, shifting to west in the afternoon. Gusts to 20 mph. .TUESDAY NIGHT...Mostly clear. Lows 37 to 42. West winds around 10 mph in the evening, shifting to southeast after midnight. Gusts to 20 mph. .WEDNESDAY...Mostly sunny. Highs 70 to 75. Southeast winds up to 10 mph in the morning, shifting to west in the afternoon. .WEDNESDAY NIGHT...Partly cloudy. Lows 41 to 46. .THURSDAY AND THURSDAY NIGHT...Mostly clear. Highs 72 to 77. Lows 43 to 48. .FRIDAY...Mostly sunny. Highs 76 to 81. Breezy. .FRIDAY NIGHT THROUGH SUNDAY...Mostly clear. Lows 44 to 51. Highs 80 to 87. && TEMPERATURE Jerome 34 61 37 65 Twin Falls 34 61 37 66 $$ = IDZ029-181400- Owyhee Mountains- 1236 AM MDT Mon May 18 2026 .TODAY...Mostly clear. Patchy blowing dust. Highs 57 to 62. Windy. North winds around 25 mph after midnight. Gusts to 35 mph. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 32 to 42. .TUESDAY...Sunny. Highs 62 to 67. .TUESDAY NIGHT...Mostly clear. Lows 38 to 47. .WEDNESDAY...Mostly sunny. Highs 66 to 71. .WEDNESDAY NIGHT...Partly cloudy. Lows 39 to 49. .THURSDAY THROUGH FRIDAY NIGHT...Mostly clear. Highs 69 to 77. Lows 43 to 53. .SATURDAY...Sunny. Highs 76 to 81. .SATURDAY NIGHT...Increasing clouds. Lows 45 to 54. .SUNDAY...Sunny. Highs 76 to 81. $$ = IDZ015-181400- Southwest Highlands- 1236 AM MDT Mon May 18 2026 .TODAY...Increasing clouds. Patchy blowing dust. Highs 55 to 64. Windy. Northwest winds around 25 mph after midnight, becoming north around 25 mph this afternoon. Gusts to 40 mph. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 31 to 37. .TUESDAY...Sunny. Highs 61 to 68. .TUESDAY NIGHT...Mostly clear. Lows 36 to 41. .WEDNESDAY...Mostly sunny. Highs 67 to 74. .WEDNESDAY NIGHT...Partly cloudy. Lows 38 to 44. .THURSDAY THROUGH FRIDAY...Mostly clear. Highs 70 to 80. Lows 41 to 46. .FRIDAY NIGHT THROUGH SATURDAY NIGHT...Partly cloudy. Lows 42 to 50. Highs 78 to 85. .SUNDAY...Sunny. Highs 79 to 85. $$ = IDZ030-181400- Southern Twin Falls County- 1236 AM MDT Mon May 18 2026 .TODAY...Decreasing clouds. Highs 57 to 62. Breezy. .TONIGHT...Partly cloudy. Lows 33 to 38. .TUESDAY...Sunny. Highs 62 to 67. .TUESDAY NIGHT...Mostly clear. Lows 37 to 42. .WEDNESDAY...Mostly sunny. Highs 69 to 74. .WEDNESDAY NIGHT...Decreasing clouds. Lows 41 to 46. .THURSDAY AND THURSDAY NIGHT...Mostly clear. Highs 71 to 76. Lows 43 to 48. .FRIDAY...Mostly sunny. Highs 74 to 79. .FRIDAY NIGHT...Mostly clear. Lows 45 to 50. .SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 79 to 84. Lows 46 to 51. .SUNDAY...Sunny. Highs 80 to 85. $$ = ORZ062-181400- Baker County- 1136 PM PDT Sun May 17 2026 .TODAY...Patchy fog. Mostly sunny, then a slight chance of rain showers this afternoon. Chance of rain 20 percent. Highs 59 to 66. Breezy. Northwest winds 10 to 20 mph. Gusts to 30 mph after midnight, then 30 mph this afternoon. .TONIGHT...Partly cloudy in the evening, then clearing. Patchy fog after midnight. Lows 31 to 41. North winds 10 to 15 mph with gusts to 30 mph in the evening, becoming light after midnight. .TUESDAY...Patchy fog in the morning. Sunny. Highs 64 to 71. Light winds. .TUESDAY NIGHT...Partly cloudy. Lows 36 to 46. Northwest winds up to 10 mph. .WEDNESDAY...Mostly sunny. Highs 66 to 74. Northwest winds up to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Patchy fog after midnight. Lows 37 to 47. .THURSDAY...Patchy fog in the morning. Sunny. Highs 70 to 78. .THURSDAY NIGHT...Partly cloudy. Lows 40 to 50. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 73 to 83. Lows 41 to 51. .SATURDAY NIGHT...Partly cloudy. Lows 42 to 52. .SUNDAY...Sunny. Highs 75 to 83. && TEMPERATURE Baker City 28 64 31 68 $$ = ORZ061-181400- Harney County- 1136 PM PDT Sun May 17 2026 .TODAY...Mostly clear after midnight, then becoming mostly sunny this morning, then becoming partly sunny this afternoon. Highs 58 to 64. Northwest winds 10 to 15 mph. Gusts to 30 mph after midnight, decreasing to 20 mph. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 30 to 37. North winds up to 10 mph. Gusts to 20 mph in the evening. .TUESDAY...Sunny. Highs 63 to 70. West winds up to 10 mph. .TUESDAY NIGHT...Increasing clouds. Lows 36 to 43. Northwest winds up to 10 mph. .WEDNESDAY...Mostly sunny. Highs 68 to 75. West winds up to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 37 to 44. .THURSDAY THROUGH SUNDAY...Mostly clear. Highs 72 to 82. Lows 39 to 49. && TEMPERATUREBurns 26 64 30 69 $$ = ORZ063-181400- Malheur County- 1236 AM MDT Mon May 18 2026 /1136 PM PDT Sun May 17 2026/ .TODAY...Increasing clouds. Highs 60 to 68. Breezy. North winds 10 to 20 mph. Gusts to 35 mph after midnight, decreasing to 25 mph. .TONIGHT...Mostly cloudy in the evening, then clearing. Lows 31 to 41. Northwest winds 10 to 15 mph. Gusts to 25 mph in the evening. .TUESDAY...Sunny. Highs 66 to 73. West winds up to 10 mph. .TUESDAY NIGHT...Mostly clear. Lows 38 to 47. North winds up to 10 mph in the evening, becoming light after midnight. .WEDNESDAY...Mostly sunny. Highs 70 to 77. Northwest winds up to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 39 to 49. Breezy. .THURSDAY THROUGH SATURDAY...Mostly clear. Highs 76 to 86. Lows 42 to 52. .SATURDAY NIGHT...Partly cloudy. Lows 44 to 53. .SUNDAY...Sunny. Highs 80 to 87. $$ =