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Grass Valley Reservoir Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY |
 |  |  |  |  |  |  |  | | | | |
| Partly Cloudy | Partly Cloudy | Chance of Rain | Chance of Rain | Rain | Chance of Rain | Clear | Mostly Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny |
| Lo: 51°FLo: 11°C | Hi: 72°FHi: 22°C | Lo: 54°FLo: 12°C | Hi: 67°FHi: 19°C | Lo: 54°FLo: 12°C | Hi: 72°FHi: 22°C | Lo: 54°FLo: 12°C | Hi: 77°FHi: 25°C | Lo: 56°FLo: 13°C | Hi: 78°FHi: 26°C | Lo: 56°FLo: 13°C | Hi: 81°FHi: 27°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 800 PM PDT Tue Sep 01 2026 
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Issued: 1102 AM PDT Tue Sep 1 2026
Key Messages
- Well below normal temperatures persist through this week.
- Increasing confidence in wet weather this week, starting in Shasta County this evening into Wednesday with isolated thunderstorms and scattered showers, widespread north of I-80 Thursday and Friday
- Mainly dry Saturday, with the potential for some remnant tropical system moisture Sunday through early next week, but confidence in details remains low at this point, with showers south of I-80 currently forecast.
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