Climate averages 1991–2020
Dunkirk weather
in August.
A mild, moderately wet month: the warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Dunkirk: daytime highs average 21.7°C and nights cool to about 14.9°C. By daytime temperature it is the warmest month of the year.
Expect about 69 mm of rain on roughly 11 days, which makes August a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 34 min on an average August day.
The nearest other city in this atlas is Calais (38 km away). In August its highs average 20.8°C, 0.9°C cooler than Dunkirk, with 65 mm of rain.
Among the 57 cities listed in France, Dunkirk ranks 54th of 57 for the warmest August highs and 43rd of 57 for the driest August (rainfall, lowest first). The mean August high of those 57 cities is 25.0°C; Dunkirk is 3.3°C cooler than that mean.
From August to September, average highs fall by 2.9°C to 18.8°C, and monthly rainfall falls from 69 mm to 57 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Dunkirk climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.9°C2.6°C | 2.6°C | 56 | 11.5 | 8.58 h |
| February | 7.6°C2.6°C | 2.6°C | 48 | 10.0 | 10.010 h |
| March | 10.2°C4.1°C | 4.1°C | 48 | 10.8 | 11.812 h |
| April | 13.5°C6.2°C | 6.2°C | 48 | 10.3 | 13.814 h |
| May | 16.6°C9.5°C | 9.5°C | 59 | 11.0 | 15.516 h |
| June | 19.2°C12.3°C | 12.3°C | 62 | 10.4 | 16.516 h |
| July | 21.5°C14.6°C | 14.6°C | 57 | 11.0 | 16.116 h |
| August, selected | 21.7°C14.9°C | 14.9°C | 69 | 10.9 | 14.615 h |
| September | 18.8°C12.6°C | 12.6°C | 57 | 9.7 | 12.713 h |
| October | 14.9°C9.6°C | 9.6°C | 63 | 11.5 | 10.811 h |
| November | 10.4°C6.1°C | 6.1°C | 64 | 12.5 | 9.09 h |
| December | 7.4°C3.4°C | 3.4°C | 68 | 12.3 | 8.08 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Calais in AugustFrance · 38 kmHigh 20.8°C · Low 15.2°C · 65 mm rain
- Brugge in AugustBelgium · 62 kmHigh 21.2°C · Low 15.2°C · 71 mm rain
- Lille in AugustFrance · 65 kmHigh 22.5°C · Low 14.1°C · 70 mm rain
- Kortrijk in AugustBelgium · 66 kmHigh 22.1°C · Low 14.3°C · 72 mm rain
- Roubaix in AugustFrance · 68 kmHigh 22.3°C · Low 14.1°C · 72 mm rain
- Saint Peters in AugustUnited Kingdom · 76 kmHigh 20.2°C · Low 15.2°C · 62 mm rain
- Gent in AugustBelgium · 94 kmHigh 22.2°C · Low 14.4°C · 74 mm rain
- Aalst in AugustBelgium · 117 kmHigh 22.4°C · Low 14.4°C · 74 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Dunkirk) is explained once on the Dunkirk year overview and on the Sources, method and limits page.