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Big Reservoir Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
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| Mostly Sunny | Chance of Rain | Chance of T-Storm | Chance of Rain | Sunny | Clear | Sunny | Clear | Clear | Sunny | Chance of Rain | Chance of Rain |
| Hi: 87°FHi: 31°C | Lo: 66°FLo: 19°C | Hi: 77°FHi: 25°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 57°FLo: 14°C | Hi: 79°FHi: 26°C | Hi: 78°FHi: 26°C Lo: 56°FLo: 13°C | Hi: 78°FHi: 26°C Lo: 56°FLo: 13°C | Hi: 72°FHi: 22°C | Hi: 73°FHi: 23°C Lo: 54°FLo: 12°C | Hi: 73°FHi: 23°C Lo: 54°FLo: 12°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 201 AM PDT Thu Aug 27 2026 
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Issued: 1117 AM PDT Wed Aug 26 2026
Key Messages
- Dry with seasonable high temperatures through Thursday, with a cool down by the weekend.
- Subtropical moisture moves into the area Friday morning, bringing slight Valley rain shower chances and isolated mountain rain shower/t-storm chances.
- Elevated Fire Weather conditions in portions of the Valley and Foothills Today and Thursday.
Discussion
... Mostly clear skies across interior NorCal this afternoon, with a few mid to upper level clouds rolling through the Valley. ALERT California ca...