Fairfield (CA)
September
Weather in Fairfield, California for September 2026
Your guide to Fairfield weather in September - trends and predictions
In general, the average temperature in Fairfield at the beginning of September is 31.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.6 °C by the end of September.
Precipitation in Fairfield during September is a rare event, with an average of fewer than 2 rainy days.
New! Chat with our AI weatherman - it’s amazing and free.
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
Move between months or click on a day
Temperatures trend during September in Fairfield
See the weather trend as well as the moving average line
September weather in Fairfield day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 2 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 3 |  Partly cloudy | 35° /13° | 0 mm | 8 | |
| Sept. 4 | Sunny | 34° /14° | 0 mm | 8 | |
| Sept. 5 | Sunny | 32° /15° | 0 mm | 8 | |
| Sept. 6 | Sunny | 31° /14° | 0 mm | 8 | |
| Sept. 7 | Sunny | 29° /14° | 0 mm | 7 | |
| Sept. 8 | Sunny | 29° /12° | 0 mm | 7 | |
| Sept. 9 | Sunny | 27° /15° | 0 mm | 7 | |
| Sept. 10 | Sunny | 23° /13° | 0 mm | 6 | |
| Sept. 11 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 12 | Sunny | 29° /12° | 0 mm | 7 | |
| Sept. 13 | Sunny | 27° /13° | 0 mm | 7 | |
| Sept. 14 | Sunny | 30° /13° | 0 mm | 7 | |
| Sept. 15 |  Overcast | 29° /13° | 0 mm | 7 | |
| Sept. 16 |  Patchy rain possible | 29° /14° | 0.6 mm | 7 | |
| Sept. 17 | Overcast | 28° /13° | 0 mm | 7 | |
| Sept. 18 | Overcast | 24° /13° | 10.8 mm | 6 | |
| Sept. 19 |  Cloudy | 27° /13° | 0 mm | 6 | |
| Sept. 20 | Overcast | 27° /12° | 0 mm | 6 | |
| Sept. 21 | Overcast | 29° /12° | 0 mm | 6 | |
| Sept. 22 | Sunny | 32° /13° | 0 mm | 8 | |
| Sept. 23 | Overcast | 38° /15° | 0 mm | 9 | |
| Sept. 24 | Partly cloudy | 30° /15° | 0 mm | 7 | |
| Sept. 25 | Overcast | 23° /13° | 0 mm | 5 | |
| Sept. 26 | Overcast | 31° /12° | 0 mm | 7 | |
| Sept. 27 | Sunny | 30° /13° | 0 mm | 8 | |
| Sept. 28 | Partly cloudy | 23° /13° | 0 mm | 6 | |
| Sept. 29 | Overcast | 27° /13° | 0 mm | 6 | |
| Sept. 30 | Sunny | 29° /14° | 0 mm | 7 | |
| Next | |||||
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 ☀️
Quick links
More Fairfield weather pages
You are here
Where is Fairfield?Get accurate weather forecasts for Fairfield, located at latitude 38.249 and longitude -122.04. Stay updated with localized weather information tailored for Fairfield.
Found a mistake?
We appreciate your attention to details. Tell us here.