FPUS55 KBOI 190637 ZFPBOI Zone Forecasts for Southwest Idaho/Southeast Oregon National Weather Service Boise ID 1236 AM MDT Tue May 19 2026 Forecast Updated. Spot temperatures are for .MONDAY THROUGH MONDAY..., Tuesday, Tuesday night, and Wednesday. IDZ011-191400- West Central Mountains- 1236 AM MDT Tue May 19 2026 .TODAY...Increasing clouds. Patchy fog. Highs 51 to 66. .TONIGHT...Partly cloudy. Lows 33 to 43. .WEDNESDAY...Partly sunny. Highs 54 to 68. .WEDNESDAY NIGHT...Decreasing clouds. Areas of fog after midnight. Lows 33 to 43. .THURSDAY...Patchy fog in the morning. Sunny. Highs 57 to 71. .THURSDAY NIGHT...Partly cloudy. Areas of fog after midnight. Lows 35 to 46. .FRIDAY...Patchy fog in the morning. Sunny. Highs 61 to 76. .FRIDAY NIGHT AND SATURDAY...Mostly clear. Lows 38 to 48. Highs 65 to 79. .SATURDAY NIGHT...Partly cloudy. Lows 39 to 49. .SUNDAY...Sunny. Highs 65 to 80. .SUNDAY NIGHT AND MEMORIAL DAY...Partly cloudy. Lows 41 to 51. Highs 61 to 75. && TEMPERATURE McCall 28 60 34 62 $$ = IDZ013-191400- Boise Mountains- 1236 AM MDT Tue May 19 2026 .TODAY...Increasing clouds. Highs 53 to 67. .TONIGHT...Partly cloudy. Lows 28 to 43. .WEDNESDAY...Partly sunny. Highs 57 to 71. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows 29 to 44. .THURSDAY...Sunny. Highs 59 to 74. .THURSDAY NIGHT...Partly cloudy. Lows 31 to 46. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 67 to 82. Lows 34 to 49. .SATURDAY NIGHT...Partly cloudy. Lows 36 to 51. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 69 to 84. Lows 38 to 53. && TEMPERATURE Idaho City 27 66 33 70 $$ = IDZ028-191400- Camas Prairie- 1236 AM MDT Tue May 19 2026 .TODAY...Increasing clouds. Highs 59 to 64. Northeast winds up to 10 mph, shifting to west this afternoon. .TONIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows 30 to 35. West winds 10 to 15 mph. Gusts to 25 mph in the evening. .WEDNESDAY...Increasing clouds. Highs 63 to 68. Breezy. Light winds in the morning, becoming west 10 to 20 mph with gusts to 30 mph in the afternoon. .WEDNESDAY NIGHT...Decreasing clouds. Lows 33 to 38. Breezy. Northwest winds 10 to 20 mph. Gusts to 30 mph in the evening. .THURSDAY...Sunny. Highs 65 to 70. Light winds in the morning, becoming west 10 to 15 mph in the afternoon. .THURSDAY NIGHT...Partly cloudy. Lows 34 to 39. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 70 to 79. Lows 36 to 41. .SATURDAY NIGHT...Partly cloudy. Lows 38 to 43. Breezy. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 75 to 81. Lows 40 to 45. Windy. && TEMPERATURE Fairfield 26 62 30 66 $$ = IDZ033-191400- Upper Weiser River- 1236 AM MDT Tue May 19 2026 .TODAY...Mostly clear. Highs 65 to 70. North winds up to 10 mph, becoming light this afternoon. .TONIGHT...Partly cloudy. Lows 42 to 47. North winds up to 10 mph. .WEDNESDAY...Partly sunny. Highs 68 to 73. Light winds. .WEDNESDAY NIGHT...Decreasing clouds. Lows 43 to 48. North winds 10 to 15 mph with gusts to 25 mph. .THURSDAY...Sunny. Highs 70 to 76. North winds around 10 mph with gusts to 20 mph. .THURSDAY NIGHT...Increasing clouds. Lows 44 to 49. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 75 to 85. Lows 48 to 53. .SATURDAY NIGHT...Partly cloudy. Lows 48 to 53. .SUNDAY...Sunny. Highs 79 to 85. .SUNDAY NIGHT AND MEMORIAL DAY...Partly cloudy. Lows 50 to 55. Highs 75 to 80. && TEMPERATURE Council 38 69 43 72 Cambridge 37 70 43 73 $$ = ORZ064-191400- Oregon Lower Treasure Valley- 1236 AM MDT Tue May 19 2026 /1136 PM PDT Mon May 18 2026/ .TODAY...Mostly clear. Highs71 to 76. Northwest winds up to 10 mph. .TONIGHT...Partly cloudy. Lows 45 to 50. North winds up to 10 mph. .WEDNESDAY...Partly sunny. Highs 74 to 79. Northwest winds up to 10 mph. .WEDNESDAY NIGHT...Increasing clouds. Lows 47 to 52. North winds 10 to 15 mph with gusts to 30 mph. .THURSDAY...Sunny. Highs 75 to 80. North winds around 10 mph with gusts to 20 mph. .THURSDAY NIGHT...Partly cloudy. Lows 48 to 53. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 79 to 89. Lows 50 to 55. .SATURDAY NIGHT...Partly cloudy. Lows 52 to 57. .SUNDAY...Sunny. Highs 84 to 89. .SUNDAY NIGHT AND MEMORIAL DAY...Partly cloudy. Lows 53 to 58. Highs 80 to 85. && TEMPERATURE Ontario 40 74 46 77 $$ = IDZ012-191400- Lower Treasure Valley- 1236 AM MDT Tue May 19 2026 .TODAY...Mostly clear. Highs 69 to 74. Northwest winds up to 10 mph. .TONIGHT...Partly cloudy. Lows 43 to 48. North winds up to 10 mph. .WEDNESDAY...Partly sunny. Highs 73 to 78. Northwest winds up to 10 mph. Gusts to 20 mph in the afternoon. .WEDNESDAY NIGHT...Mostly clear. Lows 46 to 51. Northwest winds 10 to 15 mph. .THURSDAY...Sunny. Highs 74 to 79. Northwest winds 10 to 15 mph with gusts to 25 mph. .THURSDAY NIGHT...Increasing clouds. Lows 46 to 51. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 79 to 89. Lows 49 to 54. .SATURDAY NIGHT...Partly cloudy. Lows 51 to 56. .SUNDAY...Sunny. Highs 85 to 90. .SUNDAY NIGHT...Partly cloudy in the evening, then clearing. Lows 52 to 57. .MEMORIAL DAY...Sunny. Highs 81 to 86. && TEMPERATURE Caldwell 39 72 44 75 $$ = IDZ014-191400- Upper Treasure Valley- 1236 AM MDT Tue May 19 2026 .TODAY...Mostly clear. Highs 69 to 74. Northwest winds up to 10 mph with gusts to 20 mph. .TONIGHT...Mostly clear. Lows 40 to 46. North winds 10 to 15 mph in the evening, becoming light after midnight. .WEDNESDAY...Partly sunny. Highs 73 to 78. Light winds in the morning, becoming northwest 10 to 15 mph with gusts to 25 mph in the afternoon. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows 43 to 48. Northwest winds 10 to 15 mph with gusts to 25 mph. .THURSDAY...Sunny. Highs 73 to 78. Breezy. Northwest winds 10 to 20 mph with gusts to 30 mph. .THURSDAY NIGHT...Increasing clouds. Lows 44 to 49. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 79 to 89. Lows 45 to 51. .SATURDAY NIGHT...Partly cloudy. Lows 49 to 54. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 83 to 91. Lows 49 to 55. && TEMPERATURE Boise 39 71 46 74 Mountain Home 36 71 40 76 $$ = IDZ016-191400- Western Magic Valley- 1236 AM MDT Tue May 19 2026 ...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM MDT TUESDAY... .TODAY...Mostly clear. Highs 65 to 70. South winds around 10 mph, shifting to west this afternoon. .TONIGHT...Decreasing clouds. Lows 37 to 42. West winds 10 to 15 mph in the evening, shifting to south after midnight. .WEDNESDAY...Mostly sunny in the morning, then becoming mostly cloudy. Highs 69 to 74. Light winds in the morning, becoming west 10 to 15 mph with gusts to 25 mph in the afternoon. .WEDNESDAY NIGHT...Decreasing clouds. Lows 41 to 46. West winds 10 to 15 mph. Gusts to 25 mph in the evening. .THURSDAY...Sunny. Highs 69 to 74. West winds 10 to 15 mph. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 42 to 47. Highs 75 to 80. .FRIDAY NIGHT AND SATURDAY...Mostly clear. Lows 43 to 49. Highs 81 to 86. .SATURDAY NIGHT...Partly cloudy. Lows 46 to 52. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 81 to 88. Lows 48 to 53. Breezy. && TEMPERATURE Jerome 33 65 40 69 Twin Falls 34 65 41 71 $$ = IDZ029-191400- Owyhee Mountains- 1236 AMMDT Tue May 19 2026 .TODAY...Increasing clouds. Highs 61 to 66. .TONIGHT...Partly cloudy. Lows 38 to 46. .WEDNESDAY...Partly sunny. Highs 65 to 70. .WEDNESDAY NIGHT...Partly cloudy. Lows 39 to 48. .THURSDAY...Sunny. Highs 65 to 70. .THURSDAY NIGHT...Partly cloudy. Lows 40 to 50. .FRIDAY AND FRIDAY NIGHT...Mostly clear. Highs 71 to 77. Lows 44 to 53. .SATURDAY...Sunny. Highs 76 to 81. .SATURDAY NIGHT...Partly cloudy. Lows 46 to 56. .SUNDAY...Sunny. Highs 78 to 83. .SUNDAY NIGHT...Partly cloudy. Lows 47 to 56. .MEMORIAL DAY...Sunny. Highs 74 to 80. $$ = IDZ015-191400- Southwest Highlands- 1236 AM MDT Tue May 19 2026 .TODAY...Increasing clouds. Highs 60 to 67. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 36 to 41. .WEDNESDAY...Partly sunny. Highs 66 to 73. .WEDNESDAY NIGHT...Decreasing clouds. Lows 39 to 44. .THURSDAY...Sunny. Highs 66 to 73. Breezy. .THURSDAY NIGHT...Partly cloudy. Lows 39 to 44. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 74 to 84. Lows 43 to 48. .SATURDAY NIGHT...Partly cloudy. Lows 44 to 51. .SUNDAY THROUGH MEMORIAL DAY...Mostly clear. Highs 79 to 87. Lows 45 to 52. $$ = IDZ030-191400- Southern Twin Falls County- 1236 AM MDT Tue May 19 2026 .TODAY...Mostly clear. Highs 61 to 66. .TONIGHT...Partly cloudy in the evening, then clearing. Lows 37 to 42. .WEDNESDAY...Increasing clouds. Highs 67 to 72. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows 41 to 46. .THURSDAY...Sunny. Highs 67 to 72. Breezy. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 40 to 45. Highs 73 to 78. .FRIDAY NIGHT AND SATURDAY...Mostly clear. Lows 44 to 49. Highs 79 to 84. .SATURDAY NIGHT...Partly cloudy. Lows 48 to 53. .SUNDAY...Sunny. Highs 81 to 86. .SUNDAY NIGHT...Decreasing clouds. Lows 49 to 54. .MEMORIAL DAY...Sunny. Highs 81 to 86. Breezy. $$ = ORZ062-191400- Baker County- 1136 PM PDT Mon May 18 2026 .TODAY...Increasing clouds. Patchy fog after midnight. Areas of fog this morning. Highs 63 to 70. Northwest winds up to 10 mph. .TONIGHT...Partly cloudy. Lows 35 to 45. Northwest winds up to 10 mph. .WEDNESDAY...Mostly sunny. Highs 65 to 73. Light winds in the morning, becoming northwest 10 to 15 mph with gusts to 25 mph in the afternoon. .WEDNESDAY NIGHT...Decreasing clouds. Lows 37 to 46. Breezy. Northwest winds 10 to 20 mph. Gusts to 40 mph in the evening. .THURSDAY...Sunny. Highs 68 to 75. Northwest winds up to 10 mph. .THURSDAY NIGHT...Partly cloudy. Lows 38 to 48. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 74 to 84. Lows 42 to 52. .SATURDAY NIGHT...Partly cloudy. Lows 43 to 53. .SUNDAY...Sunny. Highs 77 to 85. .SUNDAY NIGHT AND MEMORIAL DAY...Partly cloudy. Lows 43 to 53. Highs 70 to 79. Breezy. && TEMPERATURE Baker City 31 67 36 69 $$ = ORZ061-191400- Harney County- 1136 PM PDT Mon May 18 2026 .TODAY...Mostly clear. Highs 63 to 69. Northwest winds up to 10 mph. .TONIGHT...Partly cloudy. Lows 36 to 43. North winds up to 10 mph. .WEDNESDAY...Partly sunny. Highs 67 to 73. Northwest winds up to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 37 to 44. North winds 10 to 15 mph. .THURSDAY...Sunny. Highs 68 to 75. North winds up to 10 mph. .THURSDAY NIGHT...Partly cloudy. Lows 38 to 46. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 72 to 82. Lows 41 to 50. .SATURDAY NIGHT...Partly cloudy in the evening, then clearing. Lows 41 to 50. .SUNDAY...Sunny. Highs 77 to 84. .SUNDAY NIGHT...Partly cloudy. Lows 41 to 50. .MEMORIAL DAY...Sunny. Highs 71 to 79. && TEMPERATURE Burns 30 68 36 72 $$ = ORZ063-191400- Malheur County- 1236 AM MDT Tue May 19 2026 /1136 PM PDT Mon May 18 2026/ .TODAY...Increasing clouds. Highs 65 to 72. Northwest winds up to 10 mph. .TONIGHT...Partly cloudy. Lows 37 to 47. North winds up to 10 mph. .WEDNESDAY...Partly sunny. Highs 69 to 75. North winds up to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows 39 to 49. Breezy. North winds 10 to 20 mph with gusts to 30 mph. .THURSDAY...Sunny. Highs 70 to 77. North winds 10 to 15 mph. .THURSDAY NIGHT...Partly cloudy. Lows 40 to 50. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs 76 to 86. Lows 44 to 53. .SATURDAY NIGHT...Partly cloudy. Lows 45 to 54. .SUNDAY...Sunny. Highs 81 to 88. .SUNDAY NIGHT...Partly cloudy. Lows 46 to 55. .MEMORIAL DAY...Sunny. Highs 76 to 85. Breezy. $$ =