Chamonix weather is pretty evenly spread. The months May, June, July, August and September have a nice weather and is the peak season for visiting Chamonix. Temperature ranges between 7 °C to 25 °C.
On an average, July is the warmest month, January is the coldest month and August receives around 60 mm of rainfall.
To avoid peak season rush, the months of March and April also suite fine. The temperature ranges from -2 °C to 15 °C.