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The weather in Chantilly in August is hot. The average temperatures are between 20°C and 31°C.
You can expect about 3 to 8 days of rain in Chantilly 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 Chantilly in August 2025.
If you’re planning to visit Chantilly in the near future, we highly recommend that you review the 14 day weather forecast for Chantilly before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -3° | 6 | 18 | 7 | 103 mm | Awful | Chantilly in January |
| February | 7° / -2° | 7 | 15 | 7 | 118 mm | Awful | Chantilly in February |
| March | 12° / 3° | 8 | 19 | 4 | 124 mm | Awful | Chantilly in March |
| April | 18° / 8° | 8 | 22 | 1 | 122 mm | Ok | Chantilly in April |
| May | 24° / 13° | 9 | 22 | 0 | 158 mm | Good | Chantilly in May |
| June | 29° / 18° | 6 | 24 | 0 | 128 mm | Good | Chantilly in June |
| July | 32° / 20° | 6 | 25 | 0 | 139 mm | Good | Chantilly in July |
| August | 31° / 20° | 7 | 25 | 0 | 139 mm | Ok | Chantilly in August |
| September | 27° / 16° | 6 | 24 | 0 | 120 mm | Perfect | Chantilly in September |
| October | 20° / 11° | 5 | 26 | 0 | 141 mm | Good | Chantilly in October |
| November | 12° / 4° | 5 | 24 | 1 | 102 mm | Ok | Chantilly in November |
| December | 8° / 1° | 6 | 21 | 4 | 133 mm | Bad | Chantilly in December |