Zone Forecast Product
Issued by NWS Boise, ID
Issued by NWS Boise, ID
115
FPUS55 KBOI 181103
ZFPBOI
Zone Forecasts for Southwest Idaho/Southeast Oregon
National Weather Service Boise ID
502 AM MDT Tue Aug 18 2026
Forecast Updated.
Spot temperatures are for today, tonight, and Wednesday.
IDZ011-181900-
West Central Mountains-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Decreasing clouds. Isolated showers this
afternoon. Chance of rain 20 percent. Highs 75 to 89.
.TONIGHT...Mostly clear. Patchy smoke. Lows 48 to 59.
.WEDNESDAY...Sunny. Highs 77 to 91.
.WEDNESDAY NIGHT...Mostly clear. Lows 50 to 60.
.THURSDAY...Sunny. Highs 82 to 95.
.THURSDAY NIGHT...Partly cloudy. Lows 54 to 64.
.FRIDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
82 to 96.
.FRIDAY NIGHT...Mostly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 54 to 64.
.SATURDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
73 to 87.
.SATURDAY NIGHT...Partly cloudy. Areas of fog after midnight.
Lows 48 to 58.
.SUNDAY...Areas of fog in the morning. Sunny. Highs 73 to 87.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 48 to 58. Highs
75 to 89.
&&
TEMPERATURE
McCall 83 48 84
$$
=
IDZ013-181900-
Boise Mountains-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Partly cloudy. Highs 78 to 93.
.TONIGHT...Mostly clear. Patchy smoke after midnight. Lows 45 to
60.
.WEDNESDAY...Sunny. Highs 80 to 95.
.WEDNESDAY NIGHT...Mostly clear. Lows 46 to 61.
.THURSDAY...Sunny. Highs 85 to 100.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 50 to 65. Highs
85 to 100.
.FRIDAY NIGHT...Mostly cloudy. Lows 50 to 65.
.SATURDAY...Partly cloudy with a slight chance of showers. A
slight chance of thunderstorms in the afternoon. Chance of rain
20 percent. Highs 77 to 91.
.SATURDAY NIGHT...Partly cloudy with a slight chance of rain
showers in the evening, then mostly clear after midnight. Chance
of rain 20 percent. Lows 44 to 59.
.SUNDAY...Mostly sunny. Highs 76 to 91.
.SUNDAY NIGHT...Mostly clear. Lows 45 to 60.
.MONDAY...Partly cloudy. A slight chance of rain showers in the
afternoon. Chance of rain 20 percent. Highs 77 to 92.
&&
TEMPERATURE
Idaho City 92 49 94
$$
=
IDZ028-181900-
Camas Prairie-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Mostly cloudy. Highs 85 to 90. Light winds
early, becoming southwest 10 to 15 mph with gusts to 25 mph this
afternoon.
.TONIGHT...Mostly clear. Lows 48 to 54. Northwest winds 10 to
15 mph. Gusts to 25 mph in the evening.
.WEDNESDAY...Sunny. Highs 86 to 91. West winds up to 10 mph.
Gusts to 20 mph in the afternoon.
.WEDNESDAY NIGHT...Mostly clear. Lows 51 to 56. Northwest winds
around 10 mph. Gusts to 20 mph in the evening.
.THURSDAY...Sunny. Highs 91 to 96. Northeast winds around 10 mph
in the morning, shifting to south in the afternoon. Gusts to
20 mph.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 55 to 60. Highs
91 to 96.
.FRIDAY NIGHT...Mostly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 56 to 61.
.SATURDAY THROUGH SUNDAY NIGHT...Partly cloudy. Highs 82 to 89.
Lows 48 to 54.
.MONDAY...Sunny. Highs 82 to 87.
&&
TEMPERATURE
Fairfield 87 48 89
$$
=
IDZ033-181900-
Upper Weiser River-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Mostly clear. Highs 89 to 95. Northeast winds up
to 10 mph early, shifting to west this afternoon.
.TONIGHT...Mostly clear. Patchy smoke after midnight. Lows 57 to
64. North winds 10 to 15 mph.
.WEDNESDAY...Patchy smoke in the morning. Sunny. Highs 90 to 95.
Light winds.
.WEDNESDAY NIGHT...Mostly clear. Lows 61 to 66. North winds up to
10 mph.
.THURSDAY...Sunny. Highs 93 to 99. Northeast winds up to 10 mph
in the morning, shifting to southwest in the afternoon.
.THURSDAY NIGHT...Increasing clouds. Lows 65 to 70.
.FRIDAY AND FRIDAY NIGHT...Mostly cloudy. Highs 93 to 99. Lows
64 to 69.
.SATURDAY...Mostly cloudy in the morning, then clearing. Highs
86 to 92.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows 58 to 64.
Highs 85 to 93.
&&
TEMPERATURE
Council 94 61 94
Cambridge 94 57 94
$$
=
ORZ064-181900-
Oregon Lower Treasure Valley-
502 AM MDT Tue Aug 18 2026 /402 AM PDT Tue Aug 18 2026/
.REST OF TODAY...Mostly clear. Patchy smoke. Highs 93 to 98.
Northwest winds up to 10 mph.
.TONIGHT...Mostly clear. Lows 62 to 68. Northwest winds 10 to
15 mph with gusts to 25 mph.
.WEDNESDAY...Sunny. Highs 93 to 98. Northwest winds up to 10 mph
in the morning, becoming light in the afternoon.
.WEDNESDAY NIGHT...Mostly clear. Lows 62 to 68. Light winds in
the evening, becoming northwest up to 10 mph after midnight.
.THURSDAY...Sunny. Highs 95 to 100. Northwest winds up to 10 mph
in the morning, becoming light in the afternoon.
.THURSDAY NIGHT...Increasing clouds. Lows 65 to 71.
.FRIDAY AND FRIDAY NIGHT...Mostly cloudy. Highs 95 to 100. Lows
66 to 71.
.SATURDAY...Partly sunny in the morning, then clearing. Highs
90 to 95.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows 60 to 66.
Highs 89 to 95.
&&
TEMPERATURE
Ontario 95 62 95
$$
=
IDZ012-181900-
Lower Treasure Valley-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Partly cloudy. Patchy smoke. Highs 92 to 97.
Northwest winds up to 10 mph. Gusts to 20 mph this afternoon.
.TONIGHT...Mostly clear. Patchy smoke after midnight. Lows 60 to
65. Northwest winds up to 10 mph with gusts to 20 mph.
.WEDNESDAY...Patchy smoke in the morning. Sunny. Highs 92 to 97.
Light winds.
.WEDNESDAY NIGHT...Mostly clear. Lows 60 to 65. Light winds.
.THURSDAY...Sunny. Highs 95 to 100. Light winds.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 63 to 68. Highs
95 to 100.
.FRIDAY NIGHT...Increasing clouds. Lows 64 to 69.
.SATURDAY...Mostly sunny. Highs 90 to 95.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows 58 to 64.
Highs 88 to 95.
&&
TEMPERATURE
Caldwell 95 61 96
$$
=
IDZ014-181900-
Upper Treasure Valley-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Mostly cloudy. Patchy smoke this morning. Highs
92 to 97. Northwest winds up to 10 mph. Gusts to 20 mph this
afternoon.
.TONIGHT...Mostly clear. Lows 59 to 64. Northwest winds 10 to
15 mph.
.WEDNESDAY...Mostly sunny. Highs 93 to 98. Light winds.
.WEDNESDAY NIGHT...Mostly clear. Lows 60 to 66. Northeast winds
up to 10 mph.
.THURSDAY...Sunny. Highs 96 to 102. Light winds in the morning,
becoming northwest around 10 mph in the afternoon.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 63 to 68. Highs
97 to 103.
.FRIDAY NIGHT...Mostly cloudy. Lows 64 to 69.
.SATURDAY THROUGH SUNDAY...Partly cloudy. Highs 88 to 95. Lows
58 to 64.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 58 to 64. Highs
91 to 96.
&&
TEMPERATURE
Boise 94 64 96
Mountain Home 96 60 97
$$
=
IDZ016-181900-
Western Magic Valley-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Mostly cloudy. Highs 88 to 93. Southeast winds
up to 10 mph early, shifting to west this afternoon.
.TONIGHT...Decreasing clouds. Lows 58 to 63. Northwest winds
10 to 15 mph in the evening, shifting to southeast after
midnight.
.WEDNESDAY...Mostly sunny. Highs 90 to 95. Light winds.
.WEDNESDAY NIGHT...Decreasing clouds. Lows 60 to 65. Light winds
in the evening, becoming southeast around 10 mph after midnight.
.THURSDAY...Sunny. Highs 94 to 100. Northeast winds around
10 mph.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 64 to 69. Highs
96 to 101.
.FRIDAY NIGHT...Mostly cloudy with a 20 percent chance of
showers. Lows 64 to 69.
.SATURDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
87 to 92.
.SATURDAY NIGHT AND SUNDAY...Partly cloudy. A 20 percent chance
of showers. Lows 59 to 64. Highs 85 to 90.
.SUNDAY NIGHT...Partly cloudy. Lows 58 to 63.
.MONDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
87 to 92.
&&
TEMPERATURE
Jerome 89 61 90
Twin Falls 89 63 91
$$
=
IDZ029-181900-
Owyhee Mountains-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Patchy smoke early. Mostly cloudy. Highs 85 to
91.
.TONIGHT...Mostly clear. Lows 56 to 65.
.WEDNESDAY...Patchy smoke in the morning. Mostly sunny. Highs
85 to 94.
.WEDNESDAY NIGHT...Mostly clear. Lows 59 to 66.
.THURSDAY...Sunny. Highs 88 to 96.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 60 to 69. Highs
88 to 95.
.FRIDAY NIGHT...Increasing clouds. Lows 60 to 68.
.SATURDAY...Partly sunny in the morning, then clearing. Highs
83 to 90.
.SATURDAY NIGHT...Partly cloudy with a slight chance of showers
in the evening, then partly cloudy after midnight. Chance of rain
20 percent. Lows 54 to 62.
.SUNDAY...Mostly sunny. Highs 81 to 89.
.SUNDAY NIGHT...Mostly clear. Lows 55 to 63.
.MONDAY...Partly cloudy. A slight chance of showers in the
afternoon. Chance of rain 20 percent. Highs 83 to 90.
$$
=
IDZ015-181900-
Southwest Highlands-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Mostly cloudy. Highs 88 to 93.
.TONIGHT...Mostly clear. Lows 57 to 62.
.WEDNESDAY...Mostly sunny. Highs 90 to 95.
.WEDNESDAY NIGHT...Mostly clear. Lows 59 to 64.
.THURSDAY...Mostly sunny. Highs 94 to 99.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 60 to 66. Highs
93 to 99.
.FRIDAY NIGHT...Mostly cloudy. Lows 60 to 66. Breezy.
.SATURDAY AND SATURDAY NIGHT...Partly cloudy. A 20 percent chance
of showers. Highs 87 to 92. Lows 56 to 61. Breezy.
.SUNDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
84 to 89.
.SUNDAY NIGHT...Partly cloudy. Lows 56 to 61.
.MONDAY...Partly cloudy. A slight chance of showers and
thunderstorms in the afternoon. Chance of rain 20 percent. Highs
85 to 91.
$$
=
IDZ030-181900-
Southern Twin Falls County-
502 AM MDT Tue Aug 18 2026
.REST OF TODAY...Mostly cloudy. Highs 87 to 92.
.TONIGHT...Decreasing clouds. Lows 60 to 65.
.WEDNESDAY...Mostly sunny. Highs 89 to 94.
.WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing.
Lows 63 to 68.
.THURSDAY...Mostly sunny. Highs 93 to 98.
.THURSDAY NIGHT AND FRIDAY...Partly cloudy. Lows 65 to 70. Highs
94 to 99.
.FRIDAY NIGHT...Mostly cloudy. A chance of showers in the
evening. Chance of rain 30 percent. Lows 66 to 71.
.SATURDAY...Partly cloudy. A chance of showers with a slight
chance of thunderstorms in the afternoon. Chance of rain
30 percent. Highs 86 to 91.
.SATURDAY NIGHT...Mostly cloudy with a slight chance of showers
in the evening, then partly cloudy after midnight. Chance of rain
20 percent. Lows 60 to 65.
.SUNDAY...Partly cloudy. A chance of showers with a slight chance
of thunderstorms in the afternoon. Chance of rain 30 percent.
Highs 83 to 88.
.SUNDAY NIGHT...Partly cloudy. A slight chance of showers in the
evening. Chance of rain 20 percent. Lows 59 to 64.
.MONDAY...Partly cloudy. A chance of showers with a slight chance
of thunderstorms in the afternoon. Chance of rain 30 percent.
Highs 85 to 90.
$$
=
ORZ062-181900-
Baker County-
402 AM PDT Tue Aug 18 2026
.REST OF TODAY...Mostly clear. Patchy smoke. Highs 86 to 94.
Northwest winds 10 to 15 mph.
.TONIGHT...Mostly clear. Patchy smoke after midnight. Lows 46 to
61. Northwest winds 10 to 15 mph with gusts to 25 mph.
.WEDNESDAY...Sunny. Highs 88 to 95. Light winds.
.WEDNESDAY NIGHT...Mostly clear. Lows 49 to 63. North winds up to
10 mph.
.THURSDAY...Sunny. Highs 91 to 99. Light winds in the morning,
becoming southeast up to 10 mph in the afternoon.
.THURSDAY NIGHT...Increasing clouds. Lows 54 to 67.
.FRIDAY...Partly sunny. Highs 89 to 98.
.FRIDAY NIGHT...Mostly cloudy with a 20 percent chance of
showers. Lows 52 to 64.
.SATURDAY...Partly sunny in the morning, then clearing. Highs
82 to 91.
.SATURDAY NIGHT AND SUNDAY...Mostly clear. Patchy fog through the
day. Lows 43 to 57. Highs 82 to 90.
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows 45 to 59. Highs
85 to 93.
&&
TEMPERATURE
Baker City 88 46 90
$$
=
ORZ061-181900-
Harney County-
402 AM PDT Tue Aug 18 2026
.REST OF TODAY...Patchy smoke early. Partly cloudy. Highs 82 to
92. West winds up to 10 mph. Gusts to 20 mph this afternoon.
.TONIGHT...Increasing clouds. Lows 49 to 58. Northwest winds
10 to 15 mph.
.WEDNESDAY...Mostly sunny. Highs 84 to 94. Light winds in the
morning, becoming south up to 10 mph with gusts to 20 mph in the
afternoon.
.WEDNESDAY NIGHT...Mostly clear. Lows 51 to 60. Northwest winds
up to 10 mph with gusts to 20 mph.
.THURSDAY...Mostly sunny. Highs 85 to 95. Southwest winds up to
10 mph. Gusts to 20 mph in the afternoon.
.THURSDAY NIGHT THROUGH FRIDAY NIGHT...Mostly cloudy. Lows 51 to
62. Highs 84 to 94.
.SATURDAY...Mostly sunny. Highs 78 to 88.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows 45 to 56.
Highs 80 to 90.
&&
TEMPERATURE
Burns 91 49 93
$$
=
ORZ063-181900-
Malheur County-
502 AM MDT Tue Aug 18 2026 /402 AM PDT Tue Aug 18 2026/
.REST OF TODAY...Partly cloudy. Patchy smoke. Highs 90 to 95.
West winds up to 10 mph with gusts to 20 mph.
.TONIGHT...Increasing clouds. Lows 55 to 65. Northwest winds
10 to 15 mph with gusts to 25 mph.
.WEDNESDAY...Mostly sunny. Highs 91 to 98. Light winds in the
morning, becoming east up to 10 mph in the afternoon.
.WEDNESDAY NIGHT...Mostly clear. Lows 57 to 66. Northeast winds
up to 10 mph.
.THURSDAY...Sunny. Highs 94 to 99. Southwest winds up to 10 mph.
Gusts to 20 mph in the afternoon.
.THURSDAY NIGHT...Increasing clouds. Lows 59 to 68.
.FRIDAY AND FRIDAY NIGHT...Mostly cloudy. Highs 93 to 98. Lows
58 to 68.
.SATURDAY...Partly sunny in the morning, then clearing. Highs
87 to 93.
.SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows 52 to 62.
Highs 86 to 93.
$$
=