Click on a day for an hourly weather forecast
The temperatures in Dieppe in September are usually low and can range between 14°C and 18°C.
You can expect about 3 to 8 days of rain in Dieppe 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 Dieppe in September 2026.
If you’re planning to visit Dieppe in the near future, we highly recommend that you review the 14 day weather forecast for Dieppe before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 4° | 8 | 20 | 3 | 85 mm | Awful | Dieppe in January |
| February | 7° / 4° | 7 | 18 | 3 | 70 mm | Awful | Dieppe in February |
| March | 10° / 6° | 6 | 25 | 1 | 62 mm | Ok | Dieppe in March |
| April | 12° / 7° | 4 | 26 | 0 | 52 mm | Ok | Dieppe in April |
| May | 14° / 10° | 5 | 26 | 0 | 69 mm | Good | Dieppe in May |
| June | 17° / 13° | 6 | 24 | 0 | 93 mm | Good | Dieppe in June |
| July | 19° / 15° | 5 | 26 | 0 | 80 mm | Good | Dieppe in July |
| August | 19° / 16° | 6 | 25 | 0 | 97 mm | Good | Dieppe in August |
| September | 18° / 14° | 4 | 26 | 0 | 64 mm | Good | Dieppe in September |
| October | 15° / 12° | 6 | 25 | 0 | 100 mm | Good | Dieppe in October |
| November | 11° / 8° | 7 | 23 | 0 | 104 mm | Bad | Dieppe in November |
| December | 9° / 6° | 8 | 21 | 2 | 103 mm | Awful | Dieppe in December |