The temperatures in Darien in September are comfortable with low of 59°F and and high up to 75°F.
You can expect about 3 to 8 days of rain in Darien 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 Darien in September 2025.
If you’re planning to visit Darien in the near future, we highly recommend that you review the 14 day weather forecast for Darien before you arrive.
Temperatures
75° / 59°
Rainy Days
7
Snowy Days
0
Dry Days
23
Rainfall
3.07
in
Sun Hours
7.6
Hrs
