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Grass Valley Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Mostly Cloudy | Mostly Cloudy | Rain Showers | Chance of Showers | Chance of Showers | Chance of Showers | Rain Showers | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Sunny | Chance of Showers |
| Hi: 60°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 56°FHi: 13°C | Lo: 36°FLo: 2°C | Hi: 57°FHi: 14°C | Lo: 40°FLo: 4°C | Hi: 53°FHi: 12°C | Lo: 36°FLo: 2°C | Hi: 50°FHi: 10°C Lo: 36°FLo: 2°C | Hi: 50°FHi: 10°C Lo: 36°FLo: 2°C | Hi: 46°FHi: 8°C | Lo: 33°FLo: 1°C |
| POP: 70% | POP: 50% | POP: 20% | POP: 50% | POP: 70% | POP: 50% | POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 307 AM PST Thu Nov 12 2026 
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Issued: 1007 PM PST Wed Nov 11 2026
Key Messages
- Areas of dense fog redeveloping tonight and Thursday night in the Columbia Basin and adjacent valleys/foothills.
- Periods of breezy to gusty southerly winds along the Blue Mountain foothills, Grande Ronde Valley, and valley/canyon areas in Wallowa county through the weekend
- Active weather returns Friday through early next week with periods of moderate to locally heavy precipitation in the mountains and light rain in the lower elevations
Discussion
... Visible satellite imagery this afte...