May weather forecastSion, Switzerland
May
Weather in May
May's weather brings warmer days to Sion, Zurich, with temperatures continuing their northward move. Sunshine hours also see a considerable surge compared to April, marking plenteous outdoor opportunities. While rainfall is abound, the frequency of rainy days is significantly less than the previous month, painting a generally favorable weather canvas. Nature lovers can profit greatly from the blooming Swiss flora under the mildly warm sun.Temperature
May's arrival brings a modest temperature shift, moving from a wintry 5°C (41°F) in April to a frosty 8.7°C (47.7°F). In Sion, the average nighttime temperature during May is a cold 0.2°C (32.4°F).Humidity
In May, the average relative humidity in Sion is 85%.Rainfall
The month with the most rainfall is May, when the rain falls for 25.8 days and typically aggregates up to 177mm (6.97") of precipitation.Snowfall
Months with snowfall are January through May, September through December. May is the last month it regularly snows in Sion. During 0.3 snowfall days, in May, Sion aggregates 9mm (0.35") of snow. Throughout the year, there are 40.9 snowfall days, and 716mm (28.19") of snow is accumulated.Daylight
In Sion, the average length of the day in May is 14h and 59min.On the first day of May in Sion, sunrise is at 06:15 and sunset at 20:39. On the last day of the month, sunrise is at 05:42 and sunset at 21:14 CEST.
Sunshine
In Sion, the average sunshine in May is 8.2h.UV index
In May, the average daily maximum UV index in Sion is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 3 in May translates into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Sion, Switzerland
- Average high temperature in May: 8.7°C
The warmest month (with the highest average high temperature) is August (16.7°C).
The month with the lowest average high temperature is January (-2.5°C).
- Average low temperature in May: 0.2°C
The month with the highest average low temperature is August (6.4°C).
The coldest months (with the lowest average low temperature) are January and February (-11°C).
Average pressure in May
Sion, Switzerland
- Average pressure in May: 1015.7mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in May
Sion, Switzerland
- Average wind speed in May: 7.2km/h
The windiest month (with the highest average wind speed) is December (8.3km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in May
Sion, Switzerland
- Average humidity in May: 85%
The month with the highest relative humidity is March (90%).
The months with the lowest relative humidity are July and August (79%).
Average rainfall in May
Sion, Switzerland
- Average rainfall in May: 177mm
The wettest month (with the highest rainfall) is May (177mm).
The driest month (with the least rainfall) is September (76mm).
Average rainfall days in May
Sion, Switzerland
- Average rainfall days in May: 25.8 days
The month with the highest number of rainy days is May (25.8 days).
The month with the least rainy days is February (13.8 days).
Average snowfall in May
Sion, Switzerland
- Average snowfall in May: 9mm
The month with the highest snowfall is February (167mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in May
Sion, Switzerland
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is February (10.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Sion, Switzerland
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in May: 8h and 12min
The months with the most sunshine are July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in May
Sion, Switzerland
- Average sunshine days in May: 3.4 days
The month with the most sunshine days is October (13.5 days).
The month with the least sunshine days is June (2.8 days).
Average UV index in May
Sion, Switzerland
- Average UV index in May: 3
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January and November (UV index 1).
Average cloud cover in May
Sion, Switzerland
- Average cloud cover in May: 52
The months with the most cloud cover are February and March (Cloud cover 53).
The month with the least cloud cover is October (Cloud cover 37).
Average visibility in May
Sion, Switzerland
- Average visibility in May: 7km
The months with the highest visibility are June, July, August, October and November (8km).
The months with the lowest visibility are January, February and March (6km).
