Click on a day for an hourly weather forecast
The temperatures in East Sussex 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 East Sussex 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 East Sussex in September 2025.
If you’re planning to visit East Sussex in the near future, we highly recommend that you review the 14 day weather forecast for East Sussex before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 5° | 7 | 21 | 3 | 66 mm | Awful | East Sussex in January |
| February | 8° / 5° | 7 | 18 | 3 | 56 mm | Awful | East Sussex in February |
| March | 10° / 6° | 4 | 26 | 1 | 42 mm | Ok | East Sussex in March |
| April | 12° / 7° | 2 | 27 | 0 | 34 mm | Ok | East Sussex in April |
| May | 14° / 9° | 4 | 27 | 0 | 50 mm | Good | East Sussex in May |
| June | 17° / 12° | 3 | 27 | 0 | 53 mm | Good | East Sussex in June |
| July | 19° / 14° | 3 | 28 | 0 | 52 mm | Good | East Sussex in July |
| August | 20° / 15° | 3 | 28 | 0 | 59 mm | Good | East Sussex in August |
| September | 18° / 13° | 3 | 27 | 0 | 44 mm | Good | East Sussex in September |
| October | 15° / 12° | 5 | 26 | 0 | 72 mm | Good | East Sussex in October |
| November | 11° / 8° | 6 | 23 | 0 | 76 mm | Ok | East Sussex in November |
| December | 9° / 6° | 6 | 23 | 2 | 75 mm | Bad | East Sussex in December |