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City of Fairfield, CAFairfield, CA Weather Forecast
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| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT |
 |  |  |  | | | | | | | | |
| Clear | Sunny | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Sunny | Clear | Clear | Clear | Clear | Clear | Mostly Clear |
| Lo: 58°FLo: 14°C | Hi: 90°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 82°FHi: 28°C | Lo: 58°FLo: 14°C | Hi: 84°FHi: 29°C | Lo: 57°FLo: 14°C | Hi: 87°FHi: 31°C Lo: 58°FLo: 14°C | Hi: 87°FHi: 31°C Lo: 58°FLo: 14°C | Hi: 95°FHi: 35°C Lo: 61°FLo: 16°C | Hi: 95°FHi: 35°C Lo: 61°FLo: 16°C | Hi: 93°FHi: 34°C Lo: 63°FLo: 17°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 800 PM PDT Fri Sep 18 2026 
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Issued: 1234 PM PDT Fri Sep 18 2026
Key Messages
- Seasonable temperatures and dry conditions persist over the weekend with generally offshore winds.
- Isolated mountain thunderstorm chances (up to 10%) along the Sierra from Highway 50 southward on Monday.
- Dry weather remainder of next week with gradual warming trend through the middle of the week.
Discussion
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Today-Weekend: Upper level troughing is beginning to eject eastward as of early this afternoon and is expected to exit the region by Saturday. In its wake, a brief period of weak...