September
Weather in Connecticut for September 2025
Your guide to Connecticut weather in September - trends and predictions
In general, the average temperature in Connecticut at the beginning of September is 25.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °F by the end of September.
The climate of Connecticut in September is notably wet, with an average of 14 rainy days.
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16
Dry days
14
Rainy days
0
Snow days
23°/16°
Temperatures
18 km/h
Avg max wind
75 %
Avg humidity
Connecticut in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2  25° | 3 26° | 4 26° | 5  26° | 6 27° | 7 26° |
| 8  25° | 9  25° | 10 26° | 11 24° | 12  24° | 13  24° | 14  24° |
| 15 22° | 16 23° | 17 22° | 18 20° | 19 22° | 20 21° | 21 23° |
| 22 20° | 23  18° | 24 19° | 25 17° | 26 20° | 27 20° | 28 20° |
| 29  17° | 30 19° |
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Temperatures trend during September in Connecticut
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 25° /17° | 1.5 mm | 6 | |
| Sept. 2 | Partly cloudy | 25° /16° | 0 mm | 7 | |
| Sept. 3 | Sunny | 26° /15° | 0 mm | 7 | |
| Sept. 4 | Partly cloudy | 26° /17° | 0 mm | 7 | |
| Sept. 5 | Overcast | 26° /17° | 0 mm | 7 | |
| Sept. 6 | Partly cloudy | 27° /18° | 0 mm | 7 | |
| Sept. 7 | Sunny | 26° /18° | 3 mm | 7 | |
| Sept. 8 | Light rain shower | 25° /16° | 2.4 mm | 6 | |
| Sept. 9 | Patchy light rain with thunder | 25° /17° | 3.1 mm | 6 | |
| Sept. 10 | Light rain shower | 26° /19° | 4.6 mm | 6 | |
| Sept. 11 | Patchy rain possible | 24° /16° | 2.8 mm | 6 | |
| Sept. 12 | Mist | 24° /17° | 0.9 mm | 6 | |
| Sept. 13 | Moderate or heavy rain shower | 24° /16° | 31.2 mm | 6 | |
| Sept. 14 | Cloudy | 24° /17° | 0 mm | 6 | |
| Sept. 15 | Overcast | 22° /15° | 0 mm | 6 | |
| Sept. 16 | Overcast | 23° /14° | 0 mm | 5 | |
| Sept. 17 | Cloudy | 22° /15° | 0.6 mm | 5 | |
| Sept. 18 | Light rain shower | 20° /16° | 20.6 mm | 5 | |
| Sept. 19 | Sunny | 22° /17° | 0.7 mm | 6 | |
| Sept. 20 | Sunny | 21° /15° | 0 mm | 6 | |
| Sept. 21 | Partly cloudy | 23° /14° | 0 mm | 6 | |
| Sept. 22 | Overcast | 20° /14° | 0 mm | 5 | |
| Sept. 23 | Heavy rain | 18° /14° | 29.6 mm | 4 | |
| Sept. 24 | Light rain shower | 19° /13° | 0.9 mm | 4 | |
| Sept. 25 | Heavy rain | 17° /14° | 37.8 mm | 4 | |
| Sept. 26 | Patchy rain possible | 20° /14° | 21.3 mm | 5 | |
| Sept. 27 | Partly cloudy | 20° /14° | 2.5 mm | 5 | |
| Sept. 28 | Overcast | 20° /14° | 0 mm | 5 | |
| Sept. 29 | Moderate rain | 17° /15° | 3.1 mm | 4 | |
| Sept. 30 | Light rain shower | 19° /14° | 4.2 mm | 4 | |
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Important Notice
Our weather forecast for Connecticut 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 Connecticut forecast closer to your planned date for the most up-to-date weather information.
Connecticut in September - FAQ
What are the expected maximum and minimum temperatures in Connecticut during September?
During September, expect a variety of temperatures with highs around 23° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Connecticut during September?
Significant rainfall exceeding 273.6 mm is expected in Connecticut during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Connecticut during September?
The average wind speed in Connecticut during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Connecticut
Explore the daily rainfall trends and prepare for Connecticuts September weather 💧
UV exposure in Connecticut during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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