Fairfield (CA)
September
Weather in Fairfield, California for September 2026
Your guide to Fairfield weather in September - trends and predictions
Until now, September 2026 in Fairfield is slightly cooler than the historical average by 0.5 °F.
The forecast for the upcoming days in Fairfield predicts a temperature of 31.4 °F, which is slightly above the historical average.
In general, the average temperature in Fairfield at the beginning of September is 29.9 °F. As the month progressed, temperatures tended to slightly increase, reaching an average of 30.1 °F by the end of September.
Precipitation in Fairfield during September is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
More
29
Dry days
1
Rainy days
0
Snow days
29°/13°
Temperatures
18 km/h
Avg max wind
64 %
Avg humidity
Fairfield Weather September
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Temperatures trend during September in Fairfield
See the weather trend as well as the moving average line
September weather in Fairfield day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /13° | 0 mm | 8 | |
| Sept. 2 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 3 |  Partly cloudy | 31° /13° | 0.5 mm | 6 | |
| Sept. 4 | Sunny | 31° /13° | 0.1 mm | 8 | |
| Sept. 5 | Sunny | 30° /13° | 0 mm | 8 | |
| Sept. 6 | Sunny | 30° /13° | 0 mm | 8 | |
| Sept. 7 | Sunny | 30° /13° | 0 mm | 7 | |
| Sept. 8 | Sunny | 31° /12° | 0 mm | 7 | |
| Sept. 9 |  Overcast | 31° /16° | 0 mm | 5 | |
| Sept. 10 | Sunny | 27° /15° | 0 mm | 6 | |
| Sept. 11 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 12 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 13 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 14 | Sunny | 30° /12° | 0 mm | 7 | |
| Sept. 15 | Overcast | 29° /13° | 0 mm | 7 | |
| Sept. 16 | Sunny | 28° /13° | 0.4 mm | 7 | |
| Sept. 17 | Overcast | 27° /13° | 0.1 mm | 6 | |
| Sept. 18 | Overcast | 26° /13° | 7.2 mm | 6 | |
| Sept. 19 |  Cloudy | 28° /13° | 0 mm | 6 | |
| Sept. 20 | Overcast | 26° /12° | 0 mm | 4 | |
| Sept. 21 | Sunny | 24° /13° | 0 mm | 6.2 | |
| Sept. 22 | Sunny | 28° /12° | 0 mm | 6.3 | |
| Sept. 23 | Sunny | 34° /13° | 0 mm | 6.5 | |
| Sept. 24 | Sunny | 30° /15° | 0 mm | 6.3 | |
| Sept. 25 | Sunny | 28° /14° | 0 mm | 5.6 | |
| Sept. 26 | Overcast | 28° /12° | 0 mm | 7 | |
| Sept. 27 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 28 | Sunny | 32° /12° | 0 mm | 8 | |
| Sept. 29 | Sunny | 31° /13° | 0 mm | 8 | |
| Sept. 30 | Sunny | 34° /14° | 0 mm | 8 | |
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Important Notice
Our weather forecast for Fairfield in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Fairfield forecast closer to your planned date for the most up-to-date weather information.
Change Month
Fairfield in September - FAQ
What are the expected maximum and minimum temperatures in Fairfield during September?
Enjoy moderate daytime temperatures of up to 29° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Fairfield during September?
Expect minimal rainfall in Fairfield during September, with a total of 11.4 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Fairfield during September?
The average wind speed in Fairfield during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Fairfield
Explore the daily rainfall trends and prepare for Fairfields September weather 💧
Typically, Fairfield has 1 rainy days in September with a total of 11.4 mm of rainfall.
UV exposure in Fairfield during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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