Click on a day for an hourly weather forecast
The temperatures in Dunkerque in September are usually low and can range between 14°C and 19°C.
You can expect about 3 to 8 days of rain in Dunkerque 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 Dunkerque in September 2026.
If you’re planning to visit Dunkerque in the near future, we highly recommend that you review the 14 day weather forecast for Dunkerque before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 4° | 11 | 17 | 4 | 101 mm | Awful | Dunkerque in January |
| February | 7° / 4° | 8 | 17 | 4 | 81 mm | Awful | Dunkerque in February |
| March | 10° / 5° | 7 | 23 | 1 | 75 mm | Bad | Dunkerque in March |
| April | 13° / 7° | 4 | 25 | 1 | 50 mm | Ok | Dunkerque in April |
| May | 15° / 10° | 5 | 26 | 0 | 69 mm | Good | Dunkerque in May |
| June | 18° / 12° | 5 | 25 | 0 | 84 mm | Good | Dunkerque in June |
| July | 20° / 15° | 6 | 25 | 0 | 96 mm | Good | Dunkerque in July |
| August | 21° / 15° | 6 | 25 | 0 | 104 mm | Good | Dunkerque in August |
| September | 19° / 14° | 5 | 25 | 0 | 73 mm | Good | Dunkerque in September |
| October | 15° / 11° | 7 | 24 | 0 | 115 mm | Ok | Dunkerque in October |
| November | 11° / 8° | 8 | 21 | 1 | 117 mm | Bad | Dunkerque in November |
| December | 8° / 5° | 8 | 20 | 2 | 116 mm | Awful | Dunkerque in December |