Sion Monthly Climate Averages
To help you choose the best time to travel, you can find climate data below on the weather in Sion .
Best time with the soft weather for the sightseeing and long walks in Sion are May, June, July, August, September.
Temperature in Sion
The table shows that the hottest months in Sion are July and August, during which the average daytime temperature reaches +27°C and the nighttime temperature falls to +13.8°C.
The coldest months are January and December, when the daily average temperature falls to +4.4°C, and drops to -3.6°C during the night.
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The largest amount of precipitation falls on average in December and July, up to 64mm, and the least in April and March — up to 35mm.