Generally the weather in Chamonix right through September is -1 with a normal high in the month being 18 with low daily temperautes being -4 degrees. For more context we have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | -1 |
| High Temperature | 18 |
| Low Temperature | -4 |
Useful Links: Chamonix Weather: Average Weather & Yearly Climate