Click on a day for an hourly weather forecast
The temperatures in Lewes 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 Lewes 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 Lewes in September 2025.
If you’re planning to visit Lewes in the near future, we highly recommend that you review the 14 day weather forecast for Lewes before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 8 | 23 | 0 | 72 mm | Bad | Lewes in January |
| February | 8° / 4° | 7 | 21 | 0 | 57 mm | Bad | Lewes in February |
| March | 10° / 5° | 7 | 24 | 0 | 50 mm | Ok | Lewes in March |
| April | 12° / 6° | 7 | 23 | 0 | 46 mm | Ok | Lewes in April |
| May | 15° / 9° | 7 | 24 | 0 | 51 mm | Ok | Lewes in May |
| June | 18° / 12° | 7 | 23 | 0 | 64 mm | Ok | Lewes in June |
| July | 20° / 14° | 7 | 24 | 0 | 56 mm | Ok | Lewes in July |
| August | 20° / 15° | 8 | 23 | 0 | 71 mm | Ok | Lewes in August |
| September | 18° / 13° | 6 | 24 | 0 | 54 mm | Good | Lewes in September |
| October | 15° / 11° | 9 | 22 | 0 | 96 mm | Ok | Lewes in October |
| November | 11° / 8° | 10 | 20 | 0 | 94 mm | Bad | Lewes in November |
| December | 9° / 6° | 8 | 22 | 0 | 85 mm | Bad | Lewes in December |