Calais weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Poor
Best time to visit: July – August
What is the weather like in Calais in August?
In August, Calais is warm: daytime highs average 21 °C, and nights cool down to about 15 °C. The sea averages 17.8 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 71 mm in total. All in all, August is not an ideal month for a holiday in Calais.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 37 | 39 | 21 |
| Day | 21° | 21° | 19° |
| Night | 15° | 15° | 13° |
| Sea | 16° | 18° | 18° |
| Sun | 8 h | 7 h | 6 h |
| Rain days | 11 | 11 | 11 |
More details for August
- Daylight
- 14 h 38 min06:38 – 21:16
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 60 %on averageAll months
- Hot days
- 1 day30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %38 %
- Seaweight 25 %11 %
- Sunshineweight 20 %65 %
- Few rainy daysweight 20 %49 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in August
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Calais in August: quick answers
Is Calais hot in August?
Warm rather than hot: in August, daytime highs in Calais average 21 °C and nights cool to about 15 °C.
Can you swim in Calais in August?
Only if you don't mind cold water: in August the sea averages just 17.8 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Calais in August?
Rain is frequent, with about 11 rainy days and 71 mm in total.
Calais month by month
The whole year in CalaisAll destinations: FranceWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences