The temperatures in Connecticut in September are comfortable with low of 14°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Connecticut during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Connecticut in September 2025.
If you’re planning to visit Connecticut in the near future, we highly recommend that you review the 14 day weather forecast for Connecticut before you arrive.
Temperatures
24° / 14°
Rainy Days
3
Snowy Days
0
Dry Days
27
Rainfall
56
mm
Sun Hours
10.0
Hrs
