Click on a day for an hourly weather forecast
The temperatures in Calais in August are comfortable with low of 16°C and and high up to 19°C.
You can expect about 3 to 8 days of rain in Calais during the month of August. 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 Calais in August 2026.
If you’re planning to visit Calais in the near future, we highly recommend that you review the 14 day weather forecast for Calais before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 4° | 9 | 18 | 4 | 89 mm | Awful | Calais in January |
| February | 7° / 4° | 8 | 17 | 4 | 73 mm | Awful | Calais in February |
| March | 9° / 6° | 7 | 23 | 1 | 59 mm | Bad | Calais in March |
| April | 11° / 7° | 4 | 26 | 1 | 43 mm | Ok | Calais in April |
| May | 14° / 10° | 4 | 27 | 0 | 59 mm | Good | Calais in May |
| June | 17° / 13° | 4 | 26 | 0 | 72 mm | Good | Calais in June |
| July | 19° / 15° | 5 | 26 | 0 | 72 mm | Good | Calais in July |
| August | 19° / 16° | 5 | 26 | 0 | 98 mm | Good | Calais in August |
| September | 18° / 14° | 4 | 26 | 0 | 67 mm | Good | Calais in September |
| October | 15° / 12° | 7 | 24 | 0 | 104 mm | Ok | Calais in October |
| November | 11° / 8° | 7 | 22 | 0 | 114 mm | Bad | Calais in November |
| December | 8° / 6° | 9 | 20 | 2 | 112 mm | Awful | Calais in December |