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Blackstone Reservoir Weather Forecast
| REST OF TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
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| Chance of T-Storm | Partly Cloudy | Chance of Showers | Mostly Cloudy | Chance of Showers | Showers | Chance of T-Storm | Partly Cloudy | Mostly Clear | Mostly Clear | Chance of T-Storm | Partly Cloudy |
| Hi: 92°FHi: 33°C | Lo: 63°FLo: 17°C | Hi: 92°FHi: 33°C | Lo: 63°FLo: 17°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C | Lo: 51°FLo: 11°C | Hi: 76°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 76°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 82°FHi: 28°C | Hi: 82°FHi: 28°C Lo: 53°FLo: 12°C |
| POP: 40% | POP: 30% | POP: 50% | POP: 60% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1120 AM MDT Wed Aug 26 2026 
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Issued: 537 PM MDT Wed Aug 26 2026
Key Messages
- Isolated afternoon thunderstorms today and Thursday, mainly forming over the central Idaho mountains, and southern Twin Falls County.
- Thunderstorms capable of producing gusty erratic outflow winds up to 40 mph.
- Scattered showers and isolated thunderstorms over southwest Idaho on Friday and Saturday capable of producing wetting rains.
Aviation
/00Z Thursday through Friday/... Issued 518 PM MDT WED AUG 26 2026 Southwest flow aloft with isolated showers/thunderstorms possible this evening...