Click on a day for an hourly weather forecast
The temperatures in Dorset in September are usually low and can range between 13°C and 18°C.
You can expect about 3 to 8 days of rain in Dorset 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 Dorset in September 2025.
If you’re planning to visit Dorset in the near future, we highly recommend that you review the 14 day weather forecast for Dorset before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 7 | 22 | 2 | 79 mm | Awful | Dorset in January |
| February | 8° / 4° | 7 | 18 | 3 | 70 mm | Awful | Dorset in February |
| March | 10° / 5° | 5 | 26 | 0 | 53 mm | Ok | Dorset in March |
| April | 12° / 6° | 4 | 26 | 0 | 46 mm | Ok | Dorset in April |
| May | 15° / 9° | 5 | 27 | 0 | 51 mm | Good | Dorset in May |
| June | 17° / 12° | 4 | 26 | 0 | 62 mm | Good | Dorset in June |
| July | 19° / 14° | 3 | 28 | 0 | 58 mm | Good | Dorset in July |
| August | 19° / 14° | 5 | 26 | 0 | 69 mm | Good | Dorset in August |
| September | 18° / 13° | 4 | 26 | 0 | 51 mm | Good | Dorset in September |
| October | 15° / 11° | 7 | 24 | 0 | 108 mm | Ok | Dorset in October |
| November | 11° / 8° | 6 | 24 | 0 | 101 mm | Ok | Dorset in November |
| December | 9° / 6° | 7 | 23 | 1 | 88 mm | Bad | Dorset in December |