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Sewell Reservoir Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | THURSDAY |
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| Partly Sunny | Blowing Dust | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Increasing Clouds | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 98°FHi: 37°C | Lo: 65°FLo: 18°C | Hi: 92°FHi: 33°C | Lo: 61°FLo: 16°C | Hi: 88°FHi: 31°C | Lo: 60°FLo: 16°C | Hi: 88°FHi: 31°C | Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C Lo: 59°FLo: 15°C |
| POP: 30% | POP: 30% | POP: 30% | POP: 30% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 230 AM MDT Fri Aug 21 2026 
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Issued: 1227 AM MDT Fri Aug 21 2026
Key Messages
- Heat Advisory continued through Friday in the Treasure Valley, western Magic Valley, and Upper Weiser River Valley.
- Increased chance of afternoon and evening showers and thunderstorms over higher terrain Friday through Sunday.
- Above normal temperatures next week with a chance of afternoon thunderstorms over southwest Idaho Monday and Tuesday.
Aviation
/06Z Friday through Saturday/... Issued 1226 AM MDT FRI AUG 21 2026 VFR, with increasing mid-high clouds from the west. Patchy wildfire ...