Zone Forecast Product
Issued by NWS Boise, ID
Issued by NWS Boise, ID
578
FPUS55 KBOI 212031
ZFPBOI
Zone Forecasts for Southwest Idaho/Southeast Oregon
National Weather Service Boise ID
230 PM MDT Mon Sep 21 2026
Spot temperatures are for tonight, Tuesday, Tuesday night, and
Wednesday.
IDZ011-220400-
West Central Mountains-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 44 to 54.
.TUESDAY...Partly cloudy. A chance of rain showers in the
afternoon. Chance of rain 30 percent. Highs 66 to 80.
.TUESDAY NIGHT...Partly cloudy with a chance of rain showers in
the evening, then mostly clear after midnight. Chance of rain
30 percent. Lows 42 to 52.
.WEDNESDAY...Sunny. Highs 66 to 79.
.WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 44 to 54.
.THURSDAY...Sunny. Highs 70 to 83.
.THURSDAY NIGHT...Increasing clouds. Lows 46 to 56.
.FRIDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Cooler with highs 60 to 73.
.FRIDAY NIGHT...Partly cloudy. A chance of rain showers in the
evening. Areas of fog after midnight. Chance of rain 30 percent.
Colder with lows 36 to 46.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
54 to 65.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows 36 to 46. Highs
55 to 67.
.SUNDAY NIGHT AND MONDAY...Partly cloudy. Areas of fog through
the day. Lows 35 to 44. Highs 53 to 66.
&&
TEMPERATURE
McCall 44 73 42 73
$$
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IDZ013-220400-
Boise Mountains-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 40 to 55.
.TUESDAY...Partly cloudy. A chance of rain showers with a slight
chance of thunderstorms in the afternoon. Chance of rain
30 percent. Highs 67 to 82.
.TUESDAY NIGHT...Partly cloudy with a chance of rain showers in
the evening, then mostly clear after midnight. Chance of rain
30 percent. Lows 37 to 52.
.WEDNESDAY...Sunny. Highs 69 to 84.
.WEDNESDAY NIGHT...Mostly clear. Lows 40 to 55.
.THURSDAY...Sunny. Highs 74 to 89.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 42 to 57. Highs
63 to 78.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 31 to
46. Highs 57 to 72.
.MONDAY...Patchy fog in the morning. Sunny. Highs 55 to 70.
&&
TEMPERATURE
Idaho City 45 81 43 83
$$
=
IDZ028-220400-
Camas Prairie-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 42 to 47. East winds up to 10 mph.
.TUESDAY...Partly sunny. Highs 69 to 74. East winds up to 10 mph
with gusts to 20 mph.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Patchy fog after midnight. Lows 38 to 44. Northeast winds around
10 mph in the evening, becoming light after midnight.
.WEDNESDAY...Patchy fog in the morning. Sunny. Highs 73 to 78.
Light winds.
.WEDNESDAY NIGHT...Mostly clear. Lows 44 to 50. East winds up to
10 mph with gusts to 20 mph.
.THURSDAY...Sunny. Highs 77 to 82. Breezy.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 46 to 51. Highs
72 to 77. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 34 to
43. Highs 65 to 71.
.MONDAY...Sunny. Highs 63 to 68.
&&
TEMPERATURE
Fairfield 42 72 38 76
$$
=
IDZ033-220400-
Upper Weiser River-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 53 to 58. Light winds.
.TUESDAY...Mostly sunny. Highs 77 to 84. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 51 to 56. North winds 10 to 15 mph.
.WEDNESDAY...Sunny. Highs 77 to 83. Northeast winds up to 10 mph
in the morning, shifting to southwest in the afternoon.
.WEDNESDAY NIGHT...Partly cloudy. Lows 53 to 58. Light winds.
.THURSDAY...Sunny. Highs 82 to 87.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 56 to 61. Highs
72 to 78.
.FRIDAY NIGHT...Partly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Cooler with lows 44 to 49.
.SATURDAY AND SATURDAY NIGHT...Partly cloudy. Highs 64 to 71.
Lows 44 to 49.
.SUNDAY...Partly sunny. Highs 66 to 72.
.SUNDAY NIGHT...Partly cloudy. Lows 43 to 48.
.MONDAY...Sunny. Highs 65 to 72.
&&
TEMPERATURE
Council 54 83 53 82
Cambridge 53 83 52 83
$$
=
ORZ064-220400-
Oregon Lower Treasure Valley-
230 PM MDT Mon Sep 21 2026 /130 PM PDT Mon Sep 21 2026/
.TONIGHT...Decreasing clouds. Lows 51 to 58. Light winds.
.TUESDAY...Mostly sunny. Highs 82 to 87. Light winds.
.TUESDAY NIGHT...Decreasing clouds. Lows 51 to 56. Northwest
winds 10 to 15 mph.
.WEDNESDAY...Sunny. Highs 81 to 86. Northwest winds 10 to 15 mph
in the morning, becoming light in the afternoon.
.WEDNESDAY NIGHT...Partly cloudy. Lows 52 to 58. Light winds.
.THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 86 to 91.
Lows 57 to 62.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 77 to 82. Lows
45 to 50. Breezy.
.SATURDAY THROUGH SUNDAY NIGHT...Partly cloudy. Highs 68 to 76.
Lows 43 to 49.
.MONDAY...Sunny. Highs 70 to 75.
&&
TEMPERATURE
Ontario 51 85 51 84
$$
=
IDZ012-220400-
Lower Treasure Valley-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 52 to 57. Light winds.
.TUESDAY...Mostly sunny. Highs 81 to 86. Light winds.
.TUESDAY NIGHT...Mostly clear. Lows 51 to 56. Light winds.
.WEDNESDAY...Sunny. Highs 82 to 87. Light winds.
.WEDNESDAY NIGHT...Mostly clear. Lows 53 to 58. Light winds in
the evening, becoming southeast up to 10 mph after midnight.
.THURSDAY...Sunny. Highs 87 to 92.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Not as warm. Lows
56 to 61. Highs 77 to 82.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 43 to
50. Highs 67 to 75.
.MONDAY...Sunny. Highs 69 to 74.
&&
TEMPERATURE
Caldwell 53 85 52 86
$$
=
IDZ014-220400-
Upper Treasure Valley-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 51 to 57. East winds up to 10 mph.
.TUESDAY...Partly sunny in the morning, then clearing. Highs
79 to 84. Southeast winds up to 10 mph.
.TUESDAY NIGHT...Mostly clear. Lows 49 to 56. East winds up to
10 mph.
.WEDNESDAY...Sunny. Highs 83 to 88. Southeast winds up to 10 mph
with gusts to 20 mph.
.WEDNESDAY NIGHT...Mostly clear. Lows 52 to 59. East winds 10 to
15 mph with gusts to 25 mph.
.THURSDAY...Sunny. Highs 88 to 93. Breezy.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 54 to 61. Highs
79 to 84. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 43 to
51. Highs 69 to 76. Windy.
.MONDAY...Sunny. Highs 69 to 74.
&&
TEMPERATURE
Boise 57 83 56 86
Mountain Home 52 83 51 87
$$
=
IDZ016-220400-
Western Magic Valley-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Increasing clouds. Lows 50 to 55. East winds up to
10 mph with gusts to 20 mph.
.TUESDAY...Mostly cloudy. Highs 73 to 78. Southeast winds 10 to
15 mph.
.TUESDAY NIGHT...Mostly clear. Lows 46 to 51. East winds up to
10 mph.
.WEDNESDAY...Sunny. Highs 79 to 84. East winds up to 10 mph.
.WEDNESDAY NIGHT...Mostly clear. Lows 52 to 57. East winds 10 to
15 mph with gusts to 25 mph.
.THURSDAY...Sunny. Highs 83 to 88. Breezy.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 54 to 59. Highs
77 to 82. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 43 to
51. Highs 69 to 76. Windy.
.MONDAY...Sunny. Highs 66 to 71.
&&
TEMPERATURE
Jerome 52 75 48 80
Twin Falls 51 74 47 81
$$
=
IDZ029-220400-
Owyhee Mountains-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Partly cloudy. Lows 49 to 57.
.TUESDAY...Mostly sunny. Highs 74 to 80.
.TUESDAY NIGHT...Decreasing clouds. Lows 48 to 56.
.WEDNESDAY...Sunny. Highs 76 to 84.
.WEDNESDAY NIGHT...Mostly clear. Lows 53 to 59.
.THURSDAY...Sunny. Highs 81 to 87.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Not as warm. Lows
52 to 61. Highs 71 to 76. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 39 to
48. Highs 61 to 71. Breezy.
.MONDAY...Sunny. Highs 63 to 68.
$$
=
IDZ015-220400-
Southwest Highlands-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Mostly cloudy. Lows 49 to 54.
.TUESDAY...Partly sunny. Highs 73 to 79.
.TUESDAY NIGHT...Decreasing clouds. Lows 45 to 51.
.WEDNESDAY...Sunny. Highs 78 to 84.
.WEDNESDAY NIGHT...Mostly clear. Lows 50 to 56.
.THURSDAY...Sunny. Highs 82 to 88.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 51 to 57. Highs
75 to 80. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 40 to
47. Highs 67 to 74. Breezy.
.MONDAY...Sunny. Highs 65 to 70.
$$
=
IDZ030-220400-
Southern Twin Falls County-
230 PM MDT Mon Sep 21 2026
.TONIGHT...Mostly cloudy. Lows 50 to 55.
.TUESDAY...Mostly cloudy. A chance of showers with a slight
chance of thunderstorms in the afternoon. Chance of rain
30 percent. Highs 70 to 76. Breezy.
.TUESDAY NIGHT...Partly cloudy with a chance of rain showers in
the evening, then mostly clear after midnight. Chance of rain
30 percent. Lows 45 to 50.
.WEDNESDAY...Sunny. Highs 78 to 83.
.WEDNESDAY NIGHT...Mostly clear. Lows 52 to 57. Breezy.
.THURSDAY...Sunny. Highs 81 to 86. Breezy.
.THURSDAY NIGHT...Partly cloudy. Lows 54 to 59. Breezy.
.FRIDAY...Sunny. Highs 76 to 81. Breezy.
.FRIDAY NIGHT...Partly cloudy. Lows 44 to 49.
.SATURDAY...Sunny. Highs 69 to 74.
.SATURDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 42 to
48. Highs 70 to 75.
.MONDAY...Sunny. Highs 65 to 70.
$$
=
ORZ062-220400-
Baker County-
130 PM PDT Mon Sep 21 2026
.TONIGHT...Increasing clouds. Lows 44 to 57. Southeast winds up
to 10 mph this evening, becoming light after midnight.
.TUESDAY...Partly sunny. Highs 75 to 83. Northwest winds 10 to
15 mph.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 39 to 52. Northwest winds 10 to 15 mph.
.WEDNESDAY...Sunny. Highs 74 to 82. West winds up to 10 mph in
the morning, becoming light in the afternoon.
.WEDNESDAY NIGHT...Partly cloudy. Lows 41 to 54. Light winds.
.THURSDAY...Mostly sunny. Highs 79 to 87.
.THURSDAY NIGHT...Increasing clouds. Lows 42 to 55.
.FRIDAY...Partly cloudy. A chance of rain showers in the
afternoon. Chance of rain 30 percent. Cooler with highs 66 to 76.
.FRIDAY NIGHT...Partly cloudy. A slight chance of rain showers in
the evening. Areas of fog after midnight. Chance of rain
20 percent. Colder with lows 32 to 45.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
60 to 69.
.SATURDAY NIGHT...Partly cloudy. Lows 33 to 46.
.SUNDAY...Partly sunny. Highs 63 to 71.
.SUNDAY NIGHT...Partly cloudy in the evening, then clearing.
Areas of fog after midnight. Lows 32 to 45.
.MONDAY...Areas of fog in the morning. Sunny. Highs 63 to 71.
&&
TEMPERATURE
Baker City 44 78 39 77
$$
=
ORZ061-220400-
Harney County-
130 PM PDT Mon Sep 21 2026
.TONIGHT...Decreasing clouds. Lows 41 to 51. Northeast winds up
to 10 mph.
.TUESDAY...Mostly sunny. Highs 74 to 81. West winds up to 10 mph.
Gusts to 20 mph in the afternoon.
.TUESDAY NIGHT...Mostly clear. Lows 39 to 49. Northwest winds up
to 10 mph.
.WEDNESDAY...Mostly sunny. Highs 73 to 82. Light winds.
.WEDNESDAY NIGHT...Partly cloudy. Lows 41 to 52. North winds up
to 10 mph.
.THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 78 to 86.
Lows 41 to 52. Breezy.
.FRIDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Cooler with highs 64 to 71.
Breezy.
.FRIDAY NIGHT THROUGH SUNDAY NIGHT...Partly cloudy. Lows 31 to
44. Highs 61 to 69.
.MONDAY...Sunny. Highs 63 to 69.
&&
TEMPERATURE
Burns 41 81 39 79
$$
=
ORZ063-220400-
Malheur County-
230 PM MDT Mon Sep 21 2026 /130 PM PDT Mon Sep 21 2026/
.TONIGHT...Partly cloudy. Lows 47 to 57. North winds up to
10 mph.
.TUESDAY...Mostly sunny. Highs 79 to 85. Northwest winds up to
10 mph.
.TUESDAY NIGHT...Decreasing clouds. Lows 46 to 55. North winds
10 to 15 mph.
.WEDNESDAY...Sunny. Highs 78 to 86. Northeast winds up to 10 mph.
.WEDNESDAY NIGHT...Partly cloudy. Lows 49 to 57. Northeast winds
up to 10 mph in the evening, shifting to southwest after
midnight.
.THURSDAY AND THURSDAY NIGHT...Partly cloudy. Highs 83 to 90.
Lows 49 to 59.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Not as warm. Highs
71 to 79. Lows 39 to 48. Breezy.
.SATURDAY THROUGH SUNDAY NIGHT...Partly cloudy. Highs 64 to 74.
Lows 37 to 47.
.MONDAY...Sunny. Highs 67 to 73.
$$
=