The temperatures in Dorchester in September are usually low and can range between 11°C and 19°C.
You can expect about 3 to 8 days of rain in Dorchester 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 Dorchester in September 2025.
If you’re planning to visit Dorchester in the near future, we highly recommend that you review the 14 day weather forecast for Dorchester before you arrive.
Temperatures
19° / 11°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
50
mm
Sun Hours
8.7
Hrs
