Weather in Fairfield County, Connecticut for September 2025
Until now, September 2025 in Fairfield County is cooler than usual, with temperatures averaging 21.7 °F, this is -2.5 °F below the typical seasonal average.
The forecast for the next days in Fairfield County predicts temperatures to be around 24 °F, close to the historical average.
In general, the average temperature in Fairfield County at the beginning of September is 24.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.4 °F by the end of September.
Fairfield County in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 170.9 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
Fairfield County Weather September
Temperatures trend during September in Fairfield County
September weather in Fairfield County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 24° /17° | 1 mm | 6 | |
| Sept. 2 |  Partly cloudy | 25° /16° | 0 mm | 7 | |
| Sept. 3 | Sunny | 24° /15° | 0 mm | 6 | |
| Sept. 4 | Partly cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 5 |  Overcast | 26° /18° | 13.5 mm | 6 | |
| Sept. 6 | Partly cloudy | 26° /19° | 8.7 mm | 6 | |
| Sept. 7 | Sunny | 23° /16° | 13.5 mm | 6 | |
| Sept. 8 |  Light rain shower | 24° /14° | 1.6 mm | 6 | |
| Sept. 9 |  Patchy light rain with thunder | 24° /16° | 2.1 mm | 6 | |
| Sept. 10 | Light rain shower | 24° /17° | 3 mm | 6 | |
| Sept. 11 | Patchy rain possible | 24° /16° | 1.9 mm | 6 | |
| Sept. 12 | Partly cloudy | 23° /17° | 0.6 mm | 6 | |
| Sept. 13 |  Moderate or heavy rain shower | 23° /17° | 22.8 mm | 6 | |
| Sept. 14 |  Cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 22° /16° | 0 mm | 1.4 | |
| Sept. 16 | Partly cloudy | 22° /16° | 0 mm | 1.4 | |
| Sept. 17 | Cloudy | 19° /14° | 0 mm | 1 | |
| Sept. 18 | Partly cloudy | 27° /17° | 0 mm | 1.4 | |
| Sept. 19 | Sunny | 27° /18° | 0 mm | 0 | |
| Sept. 20 | Sunny | 20° /11° | 0 mm | 5 | |
| Sept. 21 | Sunny | 20° /12° | 0 mm | 5 | |
| Sept. 22 | Sunny | 22° /13° | 0 mm | 5 | |
| Sept. 23 | Sunny | 24° /15° | 0 mm | 5 | |
| Sept. 24 | Patchy rain possible | 28° /19° | 0.2 mm | 5 | |
| Sept. 25 | Partly cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 26 | Partly cloudy | 24° /17° | 0 mm | 5 | |
| Sept. 27 | Sunny | 27° /16° | 0 mm | 6 | |
| Sept. 28 | Sunny | 25° /18° | 0 mm | 6 | |
| Sept. 29 |  Moderate rain | 17° /15° | 3.1 mm | 4 | |
| Sept. 30 | Light rain shower | 19° /14° | 4.2 mm | 4 | |
| Next | |||||
Fairfield County in September - FAQ
September rainfall patterns in Fairfield County
UV exposure in Fairfield County during September
Quick links
Where is Fairfield County?Get accurate weather forecasts for Fairfield County, located at latitude 41.179 and longitude -73.189. Stay updated with localized weather information tailored for Fairfield County.