Zone Forecast Product
Issued by NWS Boise, ID
Issued by NWS Boise, ID
255
FPUS55 KBOI 201837
ZFPBOI
Zone Forecasts for Southwest Idaho/Southeast Oregon
National Weather Service Boise ID
1236 PM MDT Sun Sep 20 2026
Spot temperatures are for tonight, Monday, Monday night, and
Tuesday.
IDZ011-210200-
West Central Mountains-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Patchy fog after midnight. Lows 41 to
51.
.MONDAY...Areas of fog in the morning. Sunny. Highs 68 to 80.
.MONDAY NIGHT...Mostly cloudy. Lows 44 to 54.
.TUESDAY...Mostly sunny. Highs 68 to 81.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 43 to 53.
.WEDNESDAY...Sunny. Highs 66 to 79.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
45 to 55. Highs 69 to 82.
.FRIDAY...Partly cloudy. A chance of rain showers, mainly in the
afternoon. Chance of rain 30 percent. Cooler with highs 59 to 72.
.FRIDAY NIGHT...Mostly cloudy with a 30 percent chance of rain
showers. Areas of fog after midnight. Colder with lows 35 to 45.
.SATURDAY...A slight chance of snow showers in the morning. Areas
of fog in the morning. Partly cloudy with a slight chance of rain
showers. Chance of precipitation 20 percent. Highs 52 to 65.
.SATURDAY NIGHT AND SUNDAY...Mostly cloudy. Areas of fog through
the day. Lows 34 to 43. Highs 54 to 66.
&&
TEMPERATURE
McCall 42 75 44 75
$$
=
IDZ013-210200-
Boise Mountains-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 35 to 50.
.MONDAY...Patchy fog in the morning. Sunny. Highs 70 to 84.
.MONDAY NIGHT...Mostly cloudy. Lows 39 to 54.
.TUESDAY...Mostly sunny. Highs 69 to 84.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 37 to 52.
.WEDNESDAY...Sunny. Highs 69 to 84.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
40 to 55. Highs 73 to 88.
.FRIDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Highs 65 to 79.
.FRIDAY NIGHT...Partly cloudy with a 20 percent chance of rain
showers. Patchy fog after midnight. Lows 32 to 47.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
57 to 72.
.SATURDAY NIGHT...Partly cloudy. Lows 30 to 45.
.SUNDAY...Patchy fog in the morning. Mostly sunny. Highs 58 to
73.
&&
TEMPERATURE
Idaho City 42 83 44 83
$$
=
IDZ028-210200-
Camas Prairie-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 37 to 43. East winds up to 10 mph.
.MONDAY...Sunny. Highs 72 to 77. East winds 10 to 15 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 40 to 46. Northeast winds
around 10 mph.
.TUESDAY...Mostly sunny. Highs 73 to 78. Northeast winds around
10 mph in the morning, becoming light in the afternoon.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 40 to 45. Light winds.
.WEDNESDAY...Sunny. Highs 74 to 79.
.WEDNESDAY NIGHT...Increasing clouds. Lows 43 to 49.
.THURSDAY...Sunny. Highs 77 to 82. Breezy.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 45 to 50. Highs
73 to 78.
.FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 33 to 41.
Highs 66 to 71.
&&
TEMPERATURE
Fairfield 38 75 41 76
$$
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IDZ033-210200-
Upper Weiser River-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Clear. Lows 51 to 56. Light winds.
.MONDAY...Sunny. Highs 77 to 84. Light winds.
.MONDAY NIGHT...Mostly cloudy. Lows 53 to 58. Light winds.
.TUESDAY...Mostly sunny. Highs 79 to 85. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 51 to 56. Light winds.
.WEDNESDAY...Sunny. Highs 77 to 83.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
52 to 59. Highs 80 to 85.
.FRIDAY...Partly cloudy. A slight chance of showers in the
afternoon. Chance of rain 20 percent. Highs 71 to 77.
.FRIDAY NIGHT...Decreasing clouds. A 20 percent chance of rain
showers. Cooler with lows 43 to 48.
.SATURDAY...Mostly sunny. Highs 64 to 70.
.SATURDAY NIGHT...Increasing clouds. Lows 42 to 47.
.SUNDAY...Mostly sunny. Highs 65 to 72.
&&
TEMPERATURE
Council 52 83 54 84
Cambridge 51 83 53 85
$$
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ORZ064-210200-
Oregon Lower Treasure Valley-
1236 PM MDT Sun Sep 20 2026 /1136 AM PDT Sun Sep 20 2026/
.TONIGHT...Clear. Lows 49 to 55. Light winds.
.MONDAY...Sunny. Highs 81 to 86. East winds up to 10 mph.
.MONDAY NIGHT...Decreasing clouds. Lows 51 to 57. Light winds.
.TUESDAY...Mostly sunny. Highs 83 to 88. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 51 to 57. North winds up to 10 mph.
.WEDNESDAY...Sunny. Highs 81 to 86.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
51 to 59. Highs 84 to 89.
.FRIDAY...Partly cloudy with a 20 percent chance of showers.
Highs 75 to 80.
.FRIDAY NIGHT...Partly cloudy with a 20 percent chance of
showers. Cooler with lows 44 to 49.
.SATURDAY...Mostly sunny. Highs 67 to 72.
.SATURDAY NIGHT...Increasing clouds. Lows 42 to 47.
.SUNDAY...Mostly sunny. Highs 69 to 74.
&&
TEMPERATURE
Ontario 49 84 51 86
$$
=
IDZ012-210200-
Lower Treasure Valley-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Clear. Lows 50 to 55. Light winds.
.MONDAY...Sunny. Highs 81 to 86. Southeast winds 10 to 15 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 51 to 56. Light winds.
.TUESDAY...Mostly sunny. Highs 82 to 87. Light winds.
.TUESDAY NIGHT...Decreasing clouds. Lows 51 to 56. Light winds.
.WEDNESDAY...Sunny. Highs 81 to 86.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
52 to 59. Highs 84 to 89.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. A 20 percent chance of
rain showers. Highs 76 to 81. Lows 44 to 49.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs 67 to 74. Lows
42 to 47.
&&
TEMPERATURE
Caldwell 50 85 52 86
$$
=
IDZ014-210200-
Upper Treasure Valley-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Clear. Patchy fog after midnight. Lows 47 to 54. East
winds up to 10 mph.
.MONDAY...Areas of fog in the morning. Sunny. Highs 81 to 86.
Southeast winds 10 to 15 mph with gusts to 25 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 50 to 56. Northeast winds up
to 10 mph with gusts to 20 mph.
.TUESDAY...Mostly sunny. Highs 81 to 86. Southeast winds up to
10 mph.
.TUESDAY NIGHT...Decreasing clouds. Lows 50 to 55. Northeast
winds up to 10 mph.
.WEDNESDAY...Sunny. Highs 83 to 88.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
51 to 60. Highs 87 to 92. Breezy.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 78 to 84. Lows
43 to 49. Breezy.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs 69 to 75. Lows
41 to 47.
&&
TEMPERATURE
Boise 54 84 56 84
Mountain Home 49 85 51 85
$$
=
IDZ016-210200-
Western Magic Valley-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 45 to 50. East winds up to 10 mph
with gusts to 20 mph.
.MONDAY...Sunny. Highs 77 to 82. East winds 10 to 15 mph with
gusts to 25 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 48 to 53. East winds 10 to
15 mph.
.TUESDAY...Partly sunny. Highs 77 to 82. Southeast winds around
10 mph.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 47 to 52. Southeast winds around 10 mph.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Highs 80 to 89. Lows
51 to 56.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 54 to 59. Highs
78 to 83. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 41 to 50.
Highs 69 to 74. Breezy.
&&
TEMPERATURE
Jerome 48 79 52 78
Twin Falls 45 79 50 78
$$
=
IDZ029-210200-
Owyhee Mountains-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 47 to 54.
.MONDAY...Mostly sunny. Highs 74 to 81.
.MONDAY NIGHT...Mostly cloudy. Lows 49 to 57.
.TUESDAY...Partly cloudy. A slight chance of rain showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
75 to 81.
.TUESDAY NIGHT...Decreasing clouds. Lows 48 to 57.
.WEDNESDAY...Sunny. Highs 75 to 83.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
51 to 59. Highs 79 to 86.
.FRIDAY...Partly cloudy. A slight chance of showers in the
afternoon. Chance of rain 20 percent. Cooler with highs 70 to 75.
Breezy.
.FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 38 to 47.
Highs 60 to 69. Breezy.
$$
=
IDZ015-210200-
Southwest Highlands-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 44 to 49.
.MONDAY...Mostly sunny. Highs 77 to 82.
.MONDAY NIGHT...Mostly cloudy. Lows 49 to 54.
.TUESDAY...Partly cloudy. A chance of showers with a slight
chance of thunderstorms in the afternoon. Chance of rain
30 percent. Highs 75 to 81.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 46 to 52.
.WEDNESDAY...Sunny. Highs 79 to 85.
.WEDNESDAY NIGHT...Increasing clouds. Lows 49 to 54. Breezy.
.THURSDAY...Sunny. Highs 82 to 88. Breezy.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 51 to 57. Highs
76 to 81. Breezy.
.FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 39 to 46.
Highs 68 to 73. Breezy.
$$
=
IDZ030-210200-
Southern Twin Falls County-
1236 PM MDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 43 to 48.
.MONDAY...Mostly sunny. Highs 77 to 82.
.MONDAY NIGHT...Mostly cloudy. Lows 49 to 54.
.TUESDAY...Mostly cloudy in the morning, then partly cloudy with
a chance of rain showers with a slight chance of thunderstorms in
the afternoon. Chance of rain 30 percent. Highs 75 to 80.
.TUESDAY NIGHT...Decreasing clouds. Lows 46 to 51.
.WEDNESDAY...Sunny. Highs 78 to 83.
.WEDNESDAY NIGHT...Partly cloudy. Lows 51 to 56. Breezy.
.THURSDAY...Sunny. Highs 82 to 87. Breezy.
.THURSDAY NIGHT AND FRIDAY...Increasing clouds. Lows 54 to 59.
Highs 77 to 82. Windy.
.FRIDAY NIGHT THROUGH SUNDAY...Partly cloudy. Lows 40 to 48.
Highs 69 to 75. Breezy.
$$
=
ORZ062-210200-
Baker County-
1136 AM PDT Sun Sep 20 2026
.TONIGHT...Clear. Lows 42 to 55. Light winds.
.MONDAY...Sunny. Highs 76 to 83. Southeast winds up to 10 mph.
Gusts to 20 mph in the afternoon.
.MONDAY NIGHT...Mostly cloudy. Lows 44 to 56. Light winds.
.TUESDAY...Partly cloudy. A slight chance of rain showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
76 to 84. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 40 to 52. Northwest winds up to 10 mph with gusts to 20 mph.
.WEDNESDAY...Sunny. Highs 73 to 81.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 40 to 53.
Highs 76 to 85.
.THURSDAY NIGHT...Increasing clouds. Lows 41 to 54.
.FRIDAY...Partly cloudy with a 30 percent chance of rain showers.
Cooler with highs 64 to 74.
.FRIDAY NIGHT...Decreasing clouds. A 20 percent chance of rain
showers. Areas of fog after midnight. Colder with lows 32 to 45.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
58 to 67.
.SATURDAY NIGHT...Mostly cloudy. Areas of fog after midnight.
Lows 32 to 44.
.SUNDAY...Areas of fog in the morning. Mostly sunny. Highs 61 to
69.
&&
TEMPERATURE
Baker City 42 80 44 78
$$
=
ORZ061-210200-
Harney County-
1136 AM PDT Sun Sep 20 2026
.TONIGHT...Mostly clear. Lows 41 to 50. Northeast winds up to
10 mph. Gusts to 20 mph this evening.
.MONDAY...Mostly sunny. Highs 73 to 80. East winds up to 10 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 42 to 52. Light winds.
.TUESDAY...Partly sunny in the morning, then clearing. Highs
74 to 82. West winds up to 10 mph.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 39 to 49. Northwest winds 10 to 15 mph.
.WEDNESDAY...Sunny. Highs 72 to 81.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
40 to 52. Highs 76 to 85. Breezy.
.FRIDAY...Partly cloudy. A chance of rain showers, mainly in the
morning. Chance of rain 30 percent. Cooler with highs 63 to 71.
.FRIDAY NIGHT AND SATURDAY...Partly cloudy. Patchy fog through
the day. Lows 32 to 42. Highs 59 to 65.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows 31 to 42. Highs
61 to 67.
&&
TEMPERATURE
Burns 41 80 42 81
$$
=
ORZ063-210200-
Malheur County-
1236 PM MDT Sun Sep 20 2026 /1136 AM PDT Sun Sep 20 2026/
.TONIGHT...Mostly clear. Lows 45 to 54. East winds up to 10 mph
with gusts to 20 mph.
.MONDAY...Mostly sunny. Highs 77 to 83. Northeast winds up to
10 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 48 to 57. North winds up to
10 mph.
.TUESDAY...Partly sunny in the morning, then clearing. Highs
80 to 85. Light winds in the morning, becoming northeast up to
10 mph in the afternoon.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 46 to 56. Northwest winds up to 10 mph.
.WEDNESDAY...Sunny. Highs 78 to 85.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
48 to 57. Highs 81 to 89.
.FRIDAY...Partly cloudy with a 20 percent chance of showers. Not
as warm with highs 70 to 78. Breezy.
.FRIDAY NIGHT...Partly cloudy. A slight chance of rain showers in
the evening. Patchy fog after midnight. Chance of rain
20 percent. Colder with lows 38 to 47. Breezy.
.SATURDAY...Areas of fog in the morning. Mostly sunny. Highs
63 to 70.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy. Lows 37 to 46. Highs
65 to 72.
$$
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