Climate averages 1991–2020
Calais weather
in May.
A mild, moderately wet month: the 5th warmest and the joint 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Calais: daytime highs average 15.6°C and nights cool to about 9.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 51 mm of rain on roughly 10 days, which makes May a moderately wet month (the joint 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 30 min on an average May day.
The nearest other city in this atlas is Dunkirk (38 km away). In May its highs average 16.6°C, 0.9°C warmer than Calais, with 59 mm of rain.
Among the 57 cities listed in France, Calais ranks 56th of 57 for the warmest May highs and 8th of 57 for the driest May (rainfall, lowest first). The mean May high of those 57 cities is 18.9°C; Calais is 3.3°C cooler than that mean.
From May to June, average highs rise by 2.6°C to 18.3°C, and monthly rainfall falls from 51 mm to 49 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Dunkirk in MayFrance · 38 kmHigh 16.6°C · Low 9.5°C · 59 mm rain
- Saint Peters in MayUnited Kingdom · 55 kmHigh 14.7°C · Low 9.8°C · 49 mm rain
- Hastings, United Kingdom in MayUnited Kingdom · 90 kmHigh 15.1°C · Low 9.3°C · 47 mm rain
- Lille in MayFrance · 91 kmHigh 17.6°C · Low 8.8°C · 62 mm rain
- Roubaix in MayFrance · 97 kmHigh 17.5°C · Low 8.9°C · 62 mm rain
- Brugge in MayBelgium · 100 kmHigh 16.2°C · Low 9.8°C · 56 mm rain
- Kortrijk in MayBelgium · 100 kmHigh 17.5°C · Low 9.2°C · 62 mm rain
- Maidstone in MayUnited Kingdom · 100 kmHigh 16.4°C · Low 8.9°C · 56 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.