Sion, Valais, Switzerland Climate Change Severity
Very High
Sion Weather Condition Changes (Historic Vs 2025)
Over the past 15 year(s), Sion temperature has changed by around -15.9%, and has experienced notable climate changes.
Comparison of Weather Condition (Historic Vs 2025)
HistoricDays
Year 2025Days
Change
Sunny
Cloudy
Rainy
Snowy
MistyDisclaimer: Other weather conditions not shown may affect the total day count.
Climate Change Indicators:
Over the past 15 years, Sion has experienced measurable shifts in key climate parameters, contributing to the current severity score of 67 (within the Very High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:
Severity Score
67/100
Very High
From 2010 to 2025, Sion experienced significant changes:
Temperature change of
-1.5 °C
Variation in annual rainfall
-8.9 %
Change in average humidity
-8.02 %
PM2.5 levels surged by
-33.08 %
Heatwave changed by
-10.7 day(s)
Coldwave changed by
+17.3 day(s)
Wind speeds changed by
-0.5 km/h
These indicators show a dramatic increase in volatility and worsening conditions. Sion's Very High severity status requires urgent and immediate adaptation and mitigation strategies, particularly focused on managing extreme weather events, improving air quality, and ensuring water resources are adequate for the population.
Sion Weather Forecast 30 Days (October - November 2025)Sion, Valais, Switzerland
Temperature
humi.
Wind SpeedSunny11°/2°62%8km/h
Moderate rain6°/3°84%9km/hModerate rain9°/1°87%8km/hModerate rain7°/3°94%7km/h
Heavy rain8°/5°96%8km/hPatchy rain nearby7°/4°92%11km/hModerate rain2°/1°96%8km/h
Light rain shower1°/-5°97%12km/h
Patchy moderate snow-2°/-9°88%8km/hSunny4°/-6°88%6km/hSunny7°/-4°78%7km/hSunny7°/-3°76%7km/hSunny9°/-1°71%9km/hSunny10°/0°65%13km/h
Partly Cloudy 9°/1°78%14km/h
Moderate or heavy rain shower9°/2°85%10km/hModerate or heavy rain shower9°/1°86%11km/hModerate or heavy rain shower7°/1°90%10km/hModerate or heavy rain shower7°/0°89%10km/hModerate or heavy rain shower7°/-1°82%9km/hModerate or heavy rain shower7°/0°83%10km/hModerate or heavy rain shower7°/0°83%10km/hModerate or heavy rain shower7°/0°85%10km/hModerate or heavy rain shower7°/-1°82%10km/hModerate or heavy rain shower7°/-1°82%10km/hModerate or heavy rain shower7°/-1°82%11km/hModerate or heavy rain shower7°/0°80%10km/hModerate or heavy rain shower7°/0°80%9km/hModerate or heavy rain shower6°/-1°81%10km/hModerate or heavy rain shower6°/-2°83%9km/hHighest & Lowest Weather Forecasts
TemperatureHumidityWind Speed
Precipitation
UV
