The weather in Douglas in September is hot. The average temperatures are between 18°C and 31°C. Usually the days in September are hot while the nights are a bit cooler.
You can expect about 3 to 8 days of rain in Douglas 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 Douglas in September 2025.
If you’re planning to visit Douglas in the near future, we highly recommend that you review the 14 day weather forecast for Douglas before you arrive.
Temperatures
31° / 18°
Rainy Days
3
Snowy Days
0
Dry Days
27
Rainfall
63
mm
Sun Hours
11.8
Hrs
