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Colusa County Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY |
 |  | | |  |  | | | | | | |
| Sunny | Clear | Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Clear | Clear | Clear | Clear |
| Hi: 91°FHi: 33°C | Lo: 63°FLo: 17°C | Hi: 91°FHi: 33°C | Lo: 64°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 93°FHi: 34°C | Hi: 93°FHi: 34°C Lo: 66°FLo: 19°C | Hi: 93°FHi: 34°C Lo: 66°FLo: 19°C | Hi: 93°FHi: 34°C Lo: 65°FLo: 18°C | Hi: 93°FHi: 34°C Lo: 65°FLo: 18°C | Hi: 93°FHi: 34°C Lo: 65°FLo: 18°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 201 AM PDT Wed Sep 30 2026 
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Issued: 1228 PM PDT Tue Sep 29 2026
Key Messages
- Elevated fire weather conditions today-Thursday AM due to periods of breezy north to east winds and low humidities.
- High temperatures, 5-15 degrees above normal, will lead to Moderate HeatRisk in the Delta, Valley, and foothills Thursday-Monday
- Hottest temperatures expected Saturday & Sunday, but Valley/Delta highs will be in the mid to upper 90s Thursday- Monday
Discussion
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...Today-Thursday AM (9/29-10/01)...
Breezy north winds are already being observed through the northern Sacrame...