726
FPUS55 KBOI 200831
ZFPBOI

Zone Forecasts for Southwest Idaho/Southeast Oregon
National Weather Service Boise ID
230 AM MDT Sun Sep 20 2026

Spot temperatures are for today, tonight, and Monday.


IDZ011-201600-
West Central Mountains-
230 AM MDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 66 to 79.
.TONIGHT...Mostly clear. Patchy fog after midnight. Lows 40 to
51.
.MONDAY...Areas of fog in the morning. Sunny. Highs 68 to 81.
.MONDAY NIGHT...Partly cloudy. Lows 43 to 53.
.TUESDAY...Mostly sunny. Highs 68 to 81.
.TUESDAY NIGHT...Partly cloudy. Lows 43 to 53.
.WEDNESDAY...Sunny. Highs 67 to 80.
.WEDNESDAY NIGHT THROUGH FRIDAY...Partly cloudy. Lows 43 to 54.
Highs 66 to 80.
.FRIDAY NIGHT...Increasing clouds. Lows 40 to 50.
.SATURDAY...Patchy fog in the morning. Mostly sunny. Highs 57 to
69.

&&
               TEMPERATURE
McCall          73  40  75

$$
=

IDZ013-201600-
Boise Mountains-
230 AM MDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 66 to 80.
.TONIGHT...Mostly clear. Lows 37 to 52.
.MONDAY...Sunny. Highs 69 to 84.
.MONDAY NIGHT...Partly cloudy. Lows 39 to 54.
.TUESDAY...Mostly sunny. Highs 69 to 84.
.TUESDAY NIGHT...Partly cloudy. Lows 39 to 54.
.WEDNESDAY...Sunny. Highs 70 to 85.
.WEDNESDAY NIGHT...Increasing clouds. Lows 37 to 52.
.THURSDAY...Sunny. Highs 72 to 87.
.THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Lows 38 to
53. Highs 70 to 85.
.SATURDAY...Mostly sunny. Highs 62 to 76.

&&
               TEMPERATURE
Idaho City      79  41  83

$$
=

IDZ028-201600-
Camas Prairie-
230 AM MDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 69 to 74. South
winds up to 10 mph.
.TONIGHT...Mostly clear. Lows 33 to 39. South winds up to 10 mph
in the evening, becoming light after midnight.
.MONDAY...Sunny. Highs 73 to 78. Light winds in the morning,
becoming east 10 to 15 mph in the afternoon.
.MONDAY NIGHT...Decreasing clouds. Lows 40 to 45. East winds up
to 10 mph.
.TUESDAY...Mostly sunny. Highs 74 to 79. Light winds in the
morning, becoming southeast around 10 mph with gusts to 20 mph in
the afternoon.
.TUESDAY NIGHT...Partly cloudy. Lows 38 to 43.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Highs 76 to 82. Lows
41 to 47.
.THURSDAY NIGHT...Partly cloudy. Lows 44 to 49. Breezy.
.FRIDAY...Sunny. Highs 77 to 82.
.FRIDAY NIGHT AND SATURDAY...Increasing clouds. Lows 41 to 46.
Highs 70 to 75.

&&
               TEMPERATURE
Fairfield       72  33  76

$$
=

IDZ033-201600-
Upper Weiser River-
230 AM MDT Sun Sep 20 2026

.TODAY...Sunny. Highs 75 to 82. Light winds.
.TONIGHT...Mostly clear. Lows 50 to 55. Light winds.
.MONDAY...Sunny. Highs 77 to 83. Light winds.
.MONDAY NIGHT...Partly cloudy. Lows 52 to 57. Light winds in the
evening, becoming northeast up to 10 mph after midnight.
.TUESDAY...Mostly sunny. Highs 78 to 84. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 52 to 57.
.WEDNESDAY...Sunny. Highs 77 to 83.
.WEDNESDAY NIGHT THROUGH FRIDAY...Partly cloudy. Lows 51 to 58.
Highs 77 to 85.
.FRIDAY NIGHT...Increasing clouds. Lows 49 to 54.
.SATURDAY...Mostly sunny. Highs 68 to 74.

&&
               TEMPERATURE
Council         81  52  83
Cambridge       81  50  83

$$
=

ORZ064-201600-
Oregon Lower Treasure Valley-
230 AM MDT Sun Sep 20 2026 /130 AM PDT Sun Sep 20 2026/

.TODAY...Sunny. Highs 79 to 84. Light winds.
.TONIGHT...Mostly clear. Lows 49 to 54. Light winds.
.MONDAY...Sunny. Highs 81 to 86. Light winds.
.MONDAY NIGHT...Decreasing clouds. Lows 51 to 56. Light winds in
the evening, becoming west up to 10 mph after midnight.
.TUESDAY...Mostly sunny. Highs 82 to 87. Light winds.
.TUESDAY NIGHT...Decreasing clouds. Lows 53 to 58.
.WEDNESDAY...Sunny. Highs 82 to 87.
.WEDNESDAY NIGHT THROUGH FRIDAY...Partly cloudy. Lows 49 to 57.
Highs 82 to 87.
.FRIDAY NIGHT...Increasing clouds. Lows 49 to 54.
.SATURDAY...Mostly sunny. Not as warm with highs 72 to 77.

&&
               TEMPERATURE
Ontario         82  49  84

$$
=

IDZ012-201600-
Lower Treasure Valley-
230 AM MDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 78 to 83. Light
winds.
.TONIGHT...Mostly clear. Lows 49 to 54. Light winds.
.MONDAY...Sunny. Highs 80 to 85. Light winds in the morning,
becoming southeast 10 to 15 mph in the afternoon.
.MONDAY NIGHT...Decreasing clouds. Lows 51 to 56. Light winds.
.TUESDAY...Mostly sunny. Highs 82 to 87. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 52 to 57.
.WEDNESDAY...Sunny. Highs 81 to 86.
.WEDNESDAY NIGHT...Increasing clouds. Lows 50 to 55.
.THURSDAY...Sunny. Highs 83 to 88.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 53 to 58. Highs
82 to 87.
.FRIDAY NIGHT...Increasing clouds. Lows 49 to 54.
.SATURDAY...Mostly sunny. Not as warm with highs 71 to 76.

&&
               TEMPERATURE
Caldwell        81  50  83

$$
=

IDZ014-201600-
Upper Treasure Valley-
230 AM MDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 77 to 82.
Southeast winds up to 10 mph.
.TONIGHT...Mostly clear. Patchy fog after midnight. Lows 47 to
55. Northwest winds up to 10 mph in the evening, shifting to
southeast after midnight.
.MONDAY...Areas of fog in the morning. Mostly sunny. Highs 81 to
86. Southeast winds 10 to 15 mph. Gusts to 25 mph in the
afternoon.
.MONDAY NIGHT...Decreasing clouds. Lows 50 to 58. Northeast winds
up to 10 mph.
.TUESDAY...Mostly sunny. Highs 81 to 86. East winds up to 10 mph.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 50 to 57.
.WEDNESDAY...Sunny. Highs 84 to 89.
.WEDNESDAY NIGHT...Increasing clouds. Lows 49 to 55.
.THURSDAY AND THURSDAY NIGHT...Mostly clear. Highs 85 to 90. Lows
52 to 59. Breezy.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 84 to 89. Lows
48 to 54. Breezy.
.SATURDAY...Mostly sunny. Not as warm with highs 73 to 78.

&&
               TEMPERATURE
Boise           80  55  83
Mountain Home   80  48  85

$$
=

IDZ016-201600-
Western Magic Valley-
230 AM MDT Sun Sep 20 2026

.TODAY...Patchy fog this morning. Sunny. Highs 72 to 77. East
winds up to 10 mph.
.TONIGHT...Mostly clear. Lows 45 to 50. East winds around 10 mph.
.MONDAY...Mostly sunny. Highs 77 to 82. East winds 10 to 15 mph
with gusts to 25 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 50 to 55. East winds around
10 mph with gusts to 20 mph.
.TUESDAY...Mostly sunny. Highs 77 to 82. East winds around
10 mph.
.TUESDAY NIGHT...Decreasing clouds. Lows 49 to 54.
.WEDNESDAY THROUGH THURSDAY...Mostly clear. Highs 80 to 87. Lows
49 to 54.
.THURSDAY NIGHT...Partly cloudy. Lows 52 to 57. Breezy.
.FRIDAY...Sunny. Highs 82 to 87.
.FRIDAY NIGHT...Increasing clouds. Lows 49 to 54.
.SATURDAY...Mostly sunny. Highs 74 to 79.

&&
               TEMPERATURE
Jerome          73  48  78
Twin Falls      74  47  79

$$
=

IDZ029-201600-
Owyhee Mountains-
230 AM MDT Sun Sep 20 2026

.TODAY...Patchy fog this morning. Sunny. Highs 71 to 78.
.TONIGHT...Mostly clear. Lows 46 to 55.
.MONDAY...Mostly sunny. Highs 74 to 81.
.MONDAY NIGHT...Mostly cloudy. Lows 49 to 57.
.TUESDAY...Mostly sunny. Highs 75 to 81.
.TUESDAY NIGHT...Partly cloudy. Lows 51 to 58.
.WEDNESDAY...Sunny. Highs 76 to 83.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 49 to 56.
Highs 78 to 86.
.THURSDAY NIGHT...Mostly clear. Lows 52 to 58.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 76 to 82. Lows
46 to 53.
.SATURDAY...Mostly sunny. Highs 65 to 73.

$$
=

IDZ015-201600-
Southwest Highlands-
230 AM MDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 72 to 77.
.TONIGHT...Mostly clear. Lows 44 to 49.
.MONDAY...Patchy fog in the morning. Partly sunny. Highs 77 to
82.
.MONDAY NIGHT...Mostly cloudy. Lows 49 to 54.
.TUESDAY...Partly cloudy. A slight chance of thunderstorms in the
afternoon. Highs 76 to 81.
.TUESDAY NIGHT...Partly cloudy. Lows 48 to 53.
.WEDNESDAY...Sunny. Highs 79 to 84.
.WEDNESDAY NIGHT AND THURSDAY...Partly cloudy. Lows 47 to 52.
Highs 82 to 87.
.THURSDAY NIGHT...Mostly clear. Lows 49 to 55. Breezy.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs 79 to 85. Lows
46 to 51. Breezy.
.SATURDAY...Mostly sunny. Highs 72 to 77.

$$
=

IDZ030-201600-
Southern Twin  Falls County-
230 AM MDT Sun Sep 20 2026

.TODAY...Patchy fog this morning. Sunny. Highs 72 to 77.
.TONIGHT...Mostly clear. Lows 43 to 48.
.MONDAY...Mostly sunny. Highs 76 to 81.
.MONDAY NIGHT...Mostly cloudy. Lows 49 to 54.
.TUESDAY...Partly cloudy. A slight chance of rain showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
76 to 81.
.TUESDAY NIGHT...Decreasing clouds. Lows 49 to 54.
.WEDNESDAY...Sunny. Highs 78 to 83.
.WEDNESDAY NIGHT...Partly cloudy. Lows 49 to 54.
.THURSDAY...Sunny. Highs 81 to 86.
.THURSDAY NIGHT...Decreasing clouds. Lows 52 to 57. Breezy.
.FRIDAY...Sunny. Highs 80 to 85. Breezy.
.FRIDAY NIGHT AND SATURDAY...Partly cloudy. Lows 49 to 54. Highs
73 to 78.

$$
=

ORZ062-201600-
Baker County-
130 AM PDT Sun Sep 20 2026

.TODAY...Areas of fog this morning. Sunny. Highs 76 to 82. Light
winds.
.TONIGHT...Mostly clear. Lows 42 to 54. Light winds.
.MONDAY...Sunny. Highs 76 to 83. Southeast winds up to 10 mph.
.MONDAY NIGHT...Decreasing clouds. Lows 45 to 56. Light winds.
.TUESDAY...Mostly sunny. Highs 76 to 84. Light winds.
.TUESDAY NIGHT...Partly cloudy. Lows 41 to 52.
.WEDNESDAY...Sunny. Highs 73 to 82.
.WEDNESDAY NIGHT THROUGH FRIDAY...Partly cloudy. Lows 39 to 54.
Highs 73 to 83.
.FRIDAY NIGHT...Increasing clouds. Lows 37 to 49.
.SATURDAY...Patchy fog in the morning. Partly sunny. Cooler with
highs 63 to 71.

&&
               TEMPERATURE
Baker City      80  42  81

$$
=

ORZ061-201600-
Harney County-
130 AM PDT Sun Sep 20 2026

.TODAY...Sunny. Highs 71 to 79. East winds up to 10 mph.
.TONIGHT...Increasing clouds. Lows 38 to 48. Northeast winds up
to 10 mph.
.MONDAY...Partly sunny. Highs 71 to 80. Northeast winds up to
10 mph.
.MONDAY NIGHT...Decreasing clouds. Lows 43 to 52. Northeast winds
up to 10 mph.
.TUESDAY...Mostly sunny. Highs 73 to 82. Light winds.
.TUESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 39 to 49.
.WEDNESDAY...Sunny. Highs 72 to 81.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows
39 to 51. Highs 76 to 85.
.FRIDAY...Mostly sunny. Highs 71 to 79. Breezy.
.FRIDAY NIGHT...Decreasing clouds. Lows 36 to 46.
.SATURDAY...Mostly sunny. Highs 64 to 71.

&&
               TEMPERATURE
Burns           79  39  80

$$
=

ORZ063-201600-
Malheur County-
230 AM MDT Sun Sep 20 2026 /130 AM PDT Sun Sep 20 2026/

.TODAY...Sunny. Highs 76 to 81. East winds up to 10 mph.
.TONIGHT...Mostly clear. Lows 43 to 53. East winds up to 10 mph.
.MONDAY...Partly sunny. Highs 77 to 83. East winds up to 10 mph.
.MONDAY NIGHT...Mostly cloudy. Lows 47 to 56. Northeast winds up
to 10 mph in the evening, shifting to northwest after midnight.
.TUESDAY...Mostly sunny. Highs 79 to 85. Light winds in the
morning, becoming east up to 10 mph with gusts to 20 mph in the
afternoon.
.TUESDAY NIGHT...Partly cloudy. Lows 48 to 56.
.WEDNESDAY...Sunny. Highs 79 to 87.
.WEDNESDAY NIGHT THROUGH FRIDAY...Partly cloudy. Lows 46 to 56.
Highs 78 to 88. Breezy.
.FRIDAY NIGHT...Increasing clouds. Lows 43 to 52. Breezy.
.SATURDAY...Mostly sunny. Highs 68 to 76.

$$
=