Click on a day for an hourly weather forecast
The temperatures in Bristol in September are usually low and can range between 11°C and 18°C.
You can expect about 3 to 8 days of rain in Bristol 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 Bristol in September 2025.
If you’re planning to visit Bristol in the near future, we highly recommend that you review the 14 day weather forecast for Bristol before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 3° | 9 | 18 | 4 | 92 mm | Awful | Bristol in January |
| February | 7° / 3° | 8 | 15 | 5 | 87 mm | Awful | Bristol in February |
| March | 10° / 3° | 7 | 22 | 2 | 74 mm | Awful | Bristol in March |
| April | 12° / 5° | 5 | 24 | 1 | 59 mm | Ok | Bristol in April |
| May | 15° / 7° | 6 | 26 | 0 | 82 mm | Good | Bristol in May |
| June | 18° / 10° | 6 | 24 | 0 | 92 mm | Good | Bristol in June |
| July | 20° / 13° | 6 | 25 | 0 | 87 mm | Good | Bristol in July |
| August | 19° / 13° | 7 | 24 | 0 | 98 mm | Ok | Bristol in August |
| September | 18° / 11° | 5 | 25 | 0 | 59 mm | Good | Bristol in September |
| October | 14° / 9° | 7 | 24 | 0 | 113 mm | Ok | Bristol in October |
| November | 10° / 6° | 9 | 20 | 0 | 111 mm | Bad | Bristol in November |
| December | 8° / 4° | 9 | 20 | 2 | 117 mm | Awful | Bristol in December |