Click on a day for an hourly weather forecast
The temperatures in Devon in September are usually low and can range between 13°C and 17°C.
You can expect about 3 to 8 days of rain in Devon 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 Devon in September 2025.
If you’re planning to visit Devon in the near future, we highly recommend that you review the 14 day weather forecast for Devon before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 6° | 10 | 19 | 1 | 125 mm | Bad | Devon in January |
| February | 9° / 5° | 9 | 18 | 1 | 114 mm | Bad | Devon in February |
| March | 10° / 6° | 8 | 22 | 1 | 86 mm | Bad | Devon in March |
| April | 12° / 7° | 5 | 24 | 0 | 73 mm | Ok | Devon in April |
| May | 14° / 9° | 6 | 25 | 0 | 82 mm | Good | Devon in May |
| June | 17° / 12° | 6 | 24 | 0 | 96 mm | Good | Devon in June |
| July | 19° / 14° | 6 | 25 | 0 | 98 mm | Good | Devon in July |
| August | 19° / 14° | 7 | 24 | 0 | 106 mm | Ok | Devon in August |
| September | 17° / 13° | 4 | 26 | 0 | 68 mm | Good | Devon in September |
| October | 15° / 11° | 8 | 23 | 0 | 141 mm | Ok | Devon in October |
| November | 12° / 9° | 9 | 21 | 0 | 137 mm | Bad | Devon in November |
| December | 10° / 7° | 9 | 21 | 1 | 131 mm | Bad | Devon in December |