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Grasmere Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | MONDAY |
 |  |  |  | |  | | | | | |
| Chance of T-Storm | Chance of T-Storm | Sunny | Clouds | Sunny | Windy | Windy | Windy | Windy | Windy | Sunny |
| Hi: 76°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 81°FHi: 27°C | Lo: 53°FLo: 12°C | Hi: 85°FHi: 29°C | Hi: 80°FHi: 27°C Lo: 57°FLo: 14°C | Hi: 80°FHi: 27°C Lo: 57°FLo: 14°C | Hi: 70°FHi: 21°C Lo: 44°FLo: 7°C | Hi: 70°FHi: 21°C Lo: 44°FLo: 7°C | Hi: 70°FHi: 21°C Lo: 44°FLo: 7°C | Hi: 66°FHi: 19°C |
| POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 230 AM MDT Tue Sep 22 2026 
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Issued: 1049 AM MDT Tue Sep 22 2026
Key Messages
- Warm temperatures through Thursday, with values 10 to 15 degrees above normal Thursday.
- Chance of showers and thunderstorms Tuesday, mostly across higher terrain of southwest Idaho.
- Cooler temperatures heading into this weekend with a chance of precipitation across SE Oregon and portions of SW Idaho Friday.
Aviation
/18Z Tuesday through Wednesday/... Issued 1049 AM MDT TUE SEP 22 2026
VFR with high clouds. Isolated showers/thunderstorms this afternoon. Mainly near KTWF/KJER, over the Ce...