Click on a day for an hourly weather forecast
The temperatures in Colchester in September are usually low and can range between 13°C and 19°C.
You can expect about 3 to 8 days of rain in Colchester 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 Colchester in September 2025.
If you’re planning to visit Colchester in the near future, we highly recommend that you review the 14 day weather forecast for Colchester before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 3° | 7 | 20 | 4 | 57 mm | Awful | Colchester in January |
| February | 8° / 4° | 7 | 17 | 4 | 53 mm | Awful | Colchester in February |
| March | 10° / 5° | 5 | 24 | 1 | 45 mm | Ok | Colchester in March |
| April | 12° / 6° | 3 | 27 | 0 | 37 mm | Ok | Colchester in April |
| May | 15° / 9° | 4 | 27 | 0 | 53 mm | Good | Colchester in May |
| June | 18° / 12° | 4 | 26 | 0 | 71 mm | Good | Colchester in June |
| July | 21° / 14° | 4 | 27 | 0 | 70 mm | Good | Colchester in July |
| August | 21° / 15° | 4 | 27 | 0 | 62 mm | Good | Colchester in August |
| September | 19° / 13° | 3 | 27 | 0 | 42 mm | Good | Colchester in September |
| October | 15° / 11° | 5 | 26 | 0 | 68 mm | Good | Colchester in October |
| November | 11° / 7° | 6 | 24 | 0 | 54 mm | Ok | Colchester in November |
| December | 8° / 5° | 7 | 22 | 2 | 64 mm | Awful | Colchester in December |