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Sonoma County FairgroundsSonoma County Fairgrounds, CA Weather Forecast
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Sonoma County Fairgrounds Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
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| Patchy Fog | Patchy Fog | Patchy Fog | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Patchy Fog | Patchy Fog | Patchy Fog |
| Hi: 87°FHi: 31°C | Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C | Lo: 56°FLo: 13°C | Hi: 76°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 602 AM PDT Wed Aug 19 2026 
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Issued: 1034 AM PDT Wed Aug 19 2026
Key Messages
Updated at 1201 AM PDT Wed Aug 19 2026- Compressed marine layer today, increases Thursday into the weekend
- Near normal temperatures today followed by a gradual cooling into the weekend
- Elevations above about 1000 feet will have warm temperatures and RH values in the teens this morning into the afternoon
Aviation
... (18Z TAFS) Issued at 1027 AM PDT Wed Aug 19 2026
A mix of IFR/MVFR conditions this morning with high confidence of stratus to retreat to the coa...