Climate averages 1991–2020
Calais weather
in August.
A mild, moderately wet month: the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Calais: daytime highs average 20.8°C and nights cool to about 15.2°C. By daytime temperature it is the warmest month of the year.
Expect about 65 mm of rain on roughly 10 days, which makes August a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 34 min on an average August day.
The nearest other city in this atlas is Dunkirk (38 km away). In August its highs average 21.7°C, 0.9°C warmer than Calais, with 69 mm of rain.
Among the 57 cities listed in France, Calais ranks 56th of 57 for the warmest August highs and joint 38th of 57 for the driest August (rainfall, lowest first). The mean August high of those 57 cities is 25.0°C; Calais is 4.2°C cooler than that mean.
From August to September, average highs fall by 2.4°C to 18.4°C, and monthly rainfall rises from 65 mm to 68 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
Calais climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C3.4°C | 3.4°C | 79 | 14.3 | 8.58 h |
| February | 7.6°C3.3°C | 3.3°C | 60 | 11.5 | 10.010 h |
| March | 9.9°C4.7°C | 4.7°C | 51 | 10.5 | 11.812 h |
| April | 12.7°C6.6°C | 6.6°C | 45 | 9.3 | 13.814 h |
| May | 15.6°C9.6°C | 9.6°C | 51 | 9.8 | 15.516 h |
| June | 18.3°C12.4°C | 12.4°C | 49 | 8.7 | 16.416 h |
| July | 20.5°C14.8°C | 14.8°C | 51 | 9.6 | 16.016 h |
| August, selected | 20.8°C15.2°C | 15.2°C | 65 | 10.0 | 14.615 h |
| September | 18.4°C13.2°C | 13.2°C | 68 | 11.2 | 12.713 h |
| October | 14.9°C10.3°C | 10.3°C | 96 | 14.3 | 10.811 h |
| November | 10.7°C6.9°C | 6.9°C | 101 | 16.4 | 9.09 h |
| December | 7.8°C4.3°C | 4.3°C | 94 | 15.0 | 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
- Dunkirk in AugustFrance · 38 kmHigh 21.7°C · Low 14.9°C · 69 mm rain
- Saint Peters in AugustUnited Kingdom · 55 kmHigh 20.2°C · Low 15.2°C · 62 mm rain
- Hastings, United Kingdom in AugustUnited Kingdom · 90 kmHigh 20.2°C · Low 14.7°C · 59 mm rain
- Lille in AugustFrance · 91 kmHigh 22.5°C · Low 14.1°C · 70 mm rain
- Roubaix in AugustFrance · 97 kmHigh 22.3°C · Low 14.1°C · 72 mm rain
- Brugge in AugustBelgium · 100 kmHigh 21.2°C · Low 15.2°C · 71 mm rain
- Kortrijk in AugustBelgium · 100 kmHigh 22.1°C · Low 14.3°C · 72 mm rain
- Maidstone in AugustUnited Kingdom · 100 kmHigh 21.4°C · Low 14.1°C · 68 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 Calais) is explained once on the Calais year overview and on the Sources, method and limits page.