Connecticut (Hartford)
September
Weather in Connecticut for September 2026
Your guide to Connecticut weather in September - trends and predictions
So far, September 2026 in Connecticut is slightly warmer than the historical average by 0.8 °F.
The forecast for the next days in Connecticut predicts temperatures to be around 20 °F, close to the historical average.
In general, the average temperature in Connecticut at the beginning of September is 25 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.1 °F by the end of September.
Connecticut experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 125.5 mm.
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Temperatures
Rain 🌧️
More
20
Dry days
10
Rainy days
0
Snow days
23°/14°
Temperatures
12 km/h
Avg max wind
74 %
Avg humidity
Connecticut Weather September
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What’s the Weather Like in Connecticut This September?
Discover the average temperatures and weather trends across Connecticut’s cities this September.
Temperatures trend during September in Connecticut
See the weather trend as well as the moving average line
September weather in Connecticut day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 25° /17° | 25.5 mm | 4 | |
| Sept. 2 |  Cloudy | 24° /15° | 0.2 mm | 4 | |
| Sept. 3 |  Sunny | 26° /13° | 6.4 mm | 4 | |
| Sept. 4 | Sunny | 26° /14° | 0 mm | 6 | |
| Sept. 5 | Sunny | 27° /15° | 1.8 mm | 7 | |
| Sept. 6 |  Fog | 25° /15° | 17 mm | 5 | |
| Sept. 7 |  Moderate rain | 22° /11° | 16.7 mm | 5 | |
| Sept. 8 | Sunny | 25° /10° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 24° /12° | 0.3 mm | 4 | |
| Sept. 10 |  Overcast | 25° /14° | 0.4 mm | 4 | |
| Sept. 11 | Partly cloudy | 26° /12° | 0 mm | 7 | |
| Sept. 12 | Sunny | 25° /12° | 0 mm | 6 | |
| Sept. 13 | Partly cloudy | 25° /14° | 21.1 mm | 4 | |
| Sept. 14 | Partly cloudy | 26° /15° | 0.1 mm | 6 | |
| Sept. 15 | Cloudy | 24° /13° | 0 mm | 6 | |
| Sept. 16 | Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 17 | Mist | 23° /12° | 0 mm | 5 | |
| Sept. 18 | Sunny | 28° /18° | 0.8 mm | 6.4 | |
| Sept. 19 | Overcast | 20° /9° | 0 mm | 6.1 | |
| Sept. 20 | Overcast | 18° /10° | 32 mm | 0.6 | |
| Sept. 21 | Overcast | 20° /8° | 0 mm | 4.4 | |
| Sept. 22 | Overcast | 14° /11° | 22.1 mm | 3 | |
| Sept. 23 | Fog | 14° /11° | 28.1 mm | 3 | |
| Sept. 24 | Fog | 18° /13° | 4 mm | 4 | |
| Sept. 25 | Sunny | 20° /10° | 6 mm | 5 | |
| Sept. 26 | Sunny | 15° /7° | 0 mm | 4 | |
| Sept. 27 | Sunny | 21° /7° | 0 mm | 6 | |
| Sept. 28 | Sunny | 25° /12° | 0 mm | 6 | |
| Sept. 29 | Overcast | 26° /15° | 0 mm | 7 | |
| Sept. 30 | Sunny | 23° /15° | 0 mm | 6 | |
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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.
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Connecticut in September - FAQ
What are the expected maximum and minimum temperatures in Connecticut during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Connecticut during September?
Significant rainfall exceeding 125.5 mm is expected in Connecticut during September, occurring over more than 10 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 12 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 💧
Typically, Connecticut has 10 rainy days in September with a total of 125.5 mm of rainfall.
UV exposure in Connecticut during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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