Sion, Valais, Switzerland Climate Change Severity

57
High
The current climate change severity in Sion is High, with a 21.9% worsening in the climate score compared to last 16 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Jul. (Historical Vs 2026) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Sion Weather Condition Changes (Historic Vs 2026)

2026
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2026

Over the past 16 year(s), Sion temperature has changed by around -42.01%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
2947
62.06%
cloudyCloudy
3813
-65.7%
rainyRainy
112114
1.7%
snowySnowy
1218
50%
mistyMisty
03
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 16 years, Sion has experienced measurable shifts in key climate parameters, contributing to the current severity score of 57 (within the High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

57/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2026, Sion experienced significant changes:

Temperature change of

-3.35 °C

Variation in annual rainfall

-16.52 %

Change in average humidity

-9.94 %

PM2.5 levels surged by

-14.26 %

Heatwave changed by

-8 Days

Coldwave changed by

+24 Days

Wind speeds changed by

-0.35 km/h

These indicators show that Sion is experiencing a more volatile and extreme climate, reinforcing the need for urgent intervention to mitigate risks. As the severity score rises, focus must shift to adaptation and emergency preparedness.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jul.

Sion Weather Forecast 30 Days (August - September 2026)
Sion, Valais, Switzerland

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Mon. 3, Aug.
sunnySunny
Temperature Icon26°/13°
Humidity Icon65%
Wind Icon10.8km/h
Tue. 4, Aug.
sunnySunny
Temperature Icon24°/12°
Humidity Icon76%
Wind Icon12.6km/h
Wed. 5, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/11°
Humidity Icon69%
Wind Icon8.3km/h
Thu. 6, Aug.
sunnySunny
Temperature Icon22°/12°
Humidity Icon77%
Wind Icon13.3km/h
Fri. 7, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon21°/10°
Humidity Icon77%
Wind Icon9.7km/h
Sat. 8, Aug.
sunnySunny
Temperature Icon22°/11°
Humidity Icon70%
Wind Icon9.4km/h
Sun. 9, Aug.
sunnySunny
Temperature Icon25°/11°
Humidity Icon57%
Wind Icon8.3km/h
Mon. 10, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/12°
Humidity Icon63%
Wind Icon9.7km/h
Tue. 11, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/13°
Humidity Icon75%
Wind Icon9.4km/h
Wed. 12, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon25°/13°
Humidity Icon72%
Wind Icon9.9km/h
Thu. 13, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/14°
Humidity Icon74%
Wind Icon9.8km/h
Fri. 14, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon78%
Wind Icon9.8km/h
Sat. 15, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/13°
Humidity Icon76%
Wind Icon9.8km/h
Sun. 16, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon77%
Wind Icon9.6km/h
Mon. 17, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon78%
Wind Icon9km/h
Tue. 18, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon77%
Wind Icon9.1km/h
Wed. 19, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon77%
Wind Icon9.4km/h
Thu. 20, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon78%
Wind Icon9.4km/h
Fri. 21, Aug.
moderate rain at timesRain
Temperature Icon24°/13°
Humidity Icon74%
Wind Icon8.9km/h
Sat. 22, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/13°
Humidity Icon73%
Wind Icon9.4km/h
Sun. 23, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/13°
Humidity Icon73%
Wind Icon9.8km/h
Mon. 24, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/14°
Humidity Icon75%
Wind Icon10km/h
Tue. 25, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/12°
Humidity Icon75%
Wind Icon9.6km/h
Wed. 26, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon73%
Wind Icon10.1km/h
Thu. 27, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon22°/12°
Humidity Icon76%
Wind Icon9.6km/h
Fri. 28, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon22°/12°
Humidity Icon80%
Wind Icon9.5km/h
Sat. 29, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon21°/12°
Humidity Icon79%
Wind Icon8.8km/h
Sun. 30, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon20°/11°
Humidity Icon81%
Wind Icon9km/h
Mon. 31, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon20°/11°
Humidity Icon79%
Wind Icon10.3km/h
Tue. 1, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon20°/11°
Humidity Icon81%
Wind Icon10.5km/h
Wed. 2, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon20°/10°
Humidity Icon81%
Wind Icon9.3km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 3, Aug.

26°C

Low will be onFri. 7, Aug.

10°C

HumidityHumidity

High will be onSun. 30, Aug.

81%

Low will be onSun. 9, Aug.

57%

Wind SpeedWind Speed

High will be onThu. 6, Aug.

13.3km/h

Low will be onWed. 5, Aug.

8.3km/h

PrecipitationPrecipitation

High will be onTue. 4, Aug.

9.3mm

Low will be onSat. 8, Aug.

0.03mm

Ultraviolet IndexUV

High will be onMon. 3, Aug.

8.6

Low will be onTue. 1, Sep.

3

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