The weather in the French alps throughout the summer is very pleasant with lovely warm days and cooler nights. We have low humidity which is ideal for working on your projects.
We usually have a period of 5 or 6 days of warm dry weather which build throughout the week and end with a thunder storm and a couple of cooler days.
The chart above outlines the average monthly temperatures through out the summer months. as you can see there is quite a difference between the lows and highs but expect the temperatures to be between these ranges.