Connecticut (Hartford)
September
Weather in Connecticut for September 2027
Your guide to Connecticut weather in September - trends and predictions
In general, the average temperature in Connecticut at the beginning of September is 24.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.3 °C by the end of September.
Connecticut experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 181.8 mm.
Is September a good time to visit Connecticut? check out the best time to travel to Connecticut page.
✨ Is September a good time to visit Connecticut? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
23°/14°
Temperatures
13 km/h
Avg max wind
74 %
Avg humidity
Connecticut Weather September
Move between months or click on a day
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
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Heavy rain | 25° /17° | 25.5 mm | 4 | |
| Sept. 2 |  Cloudy | 24° /15° | 0.2 mm | 4 | |
| Sept. 3 |  Light rain | 26° /13° | 6.4 mm | 4 | |
| Sept. 4 |  Sunny | 25° /14° | 0 mm | 6 | |
| Sept. 5 |  Patchy rain possible | 26° /15° | 1.8 mm | 7 | |
| Sept. 6 |  Moderate rain | 25° /15° | 17 mm | 5 | |
| Sept. 7 | Moderate rain | 22° /11° | 16.7 mm | 5 | |
| Sept. 8 | Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 23° /12° | 0.3 mm | 4 | |
| Sept. 10 |  Overcast | 24° /14° | 0.4 mm | 4 | |
| Sept. 11 | Partly cloudy | 25° /12° | 0 mm | 7 | |
| Sept. 12 | Sunny | 25° /13° | 0 mm | 6 | |
| Sept. 13 | Moderate rain | 24° /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 | Patchy rain possible | 24° /14° | 1 mm | 4 | |
| Sept. 18 | Patchy rain possible | 25° /16° | 1.5 mm | 5 | |
| Sept. 19 | Light rain | 22° /14° | 3 mm | 4 | |
| Sept. 20 | Light rain | 19° /14° | 3.1 mm | 4 | |
| Sept. 21 | Overcast | 19° /12° | 0.2 mm | 3 | |
| Sept. 22 | Overcast | 21° /12° | 0 mm | 3 | |
| Sept. 23 | Overcast | 21° /13° | 0 mm | 4 | |
| Sept. 24 | Overcast | 20° /12° | 0 mm | 5 | |
| Sept. 25 | Moderate rain | 19° /13° | 11 mm | 3 | |
| Sept. 26 | Heavy rain | 21° /15° | 41.3 mm | 4 | |
| Sept. 27 | Moderate rain | 20° /14° | 13.5 mm | 4 | |
| Sept. 28 | Moderate rain | 20° /15° | 17.7 mm | 4 | |
| Sept. 29 | Overcast | 21° /14° | 0 mm | 4 | |
| Sept. 30 | Overcast | 21° /13° | 0 mm | 4 | |
| Next | |||||
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.
Change Month
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 181.8 mm is expected in Connecticut during September, occurring over more than 8 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 13 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 8 rainy days in September with a total of 181.8 mm of rainfall.
UV exposure in Connecticut during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Counties in Connecticut
Select a county for an accurate weather forecast
Top locations in Connecticut
Select a location for an accurate weather forecast
More Locations Quick links
More Connecticut weather pages
You are here
Found a mistake?
We appreciate your attention to details. Tell us here.