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Valley County Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  | |  | | |  |  |  |  | |
| Patchy Fog | Sunny | Mostly Cloudy | Mostly Sunny | Clearing | Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Snow Showers | Mostly Cloudy |
| Lo: 47°FLo: 8°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 73°FHi: 23°C | Hi: 76°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 76°FHi: 24°C Lo: 51°FLo: 11°C | Hi: 66°FHi: 19°C | Lo: 41°FLo: 5°C | Hi: 59°FHi: 15°C | Hi: 61°FHi: 16°C Lo: 39°FLo: 4°C |
| POP: 30% | POP: 30% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 230 PM MDT Sun Sep 20 2026 
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Issued: 221 PM MDT Sun Sep 20 2026
Key Messages
- Mostly dry with warming temperatures through Thursday.
- Chance of showers and thunderstorms Tuesday, mostly across higher terrain of southwest Idaho.
- Cooler temperatures heading into next weekend with a chance of precipitation across SE Oregon and portions of SW Idaho Friday.
Aviation
/18Z Sunday through Monday/... Issued 1232 PM MDT SUN SEP 20 2026 VFR. Patchy mountain valley fog overnight. Surface winds: variable 5-10kt. Winds aloft at 10kft MSL: variable 5-15kt.
KBOI...VFR. Surface wi...