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Port Costa Weather Forecast
| REST OF TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY | THURSDAY |
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| Sunny | Clear | Sunny | Clear | Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 70°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C Lo: 49°FLo: 9°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 302 PM PDT Fri Oct 23 2026 
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Issued: 254 PM PDT Fri Oct 23 2026
Key Messages
Updated at 1200 PM PDT Fri Oct 23 2026- Gusty offshore flow across the North Bay Interior Mountains this evening through Saturday morning
- Below normal temperatures today, increasing to near normal for the weekend
- Coastal flooding due astronomical high tides and thermal expansion this weekend through at least the middle of next week
Aviation
... (18Z TAFS) Issued at 1104 AM PDT Fri Oct 23 2026
Satellite imagery is messy this morning, depicting a mix of clear skies but also MVFR to VFR cei...