Sundsvall, Vasternorrland, Sweden Climate Change Severity

33
Moderate
The current climate change severity in Sundsvall is Moderate, with a 23.4% improvement in the climate score compared to last 15 years. This suggests improved conditions, with more favorable environmental indicators and a reduction in negative impacts.
Data: Jan. to Aug. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Sundsvall Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), Sundsvall temperature has changed by around +8.2%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Aug. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
2822
-21.4%
cloudyCloudy
6045
-25%
rainyRainy
9969
-30.3%
snowySnowy
138
-38.4%
mistyMisty
02
100%

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

Climate Change Indicators:

Over the past 15 years, Sundsvall has experienced measurable improvements in key climate parameters, contributing to the current severity score of 33 (within the Moderate severity category). This suggests improving climate conditions compared to previous years. Here’s a breakdown of the specific changes observed:

Severity Score

33/100

Moderate

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Sundsvall experienced significant changes:

Temperature change of

+0.4 °C

Variation in annual rainfall

-16.4 %

Change in average humidity

-3.4 %

PM2.5 levels surged by

-23.3 %

Heatwave changed by

+5.2 day(s)

Coldwave changed by

-3.1 day(s)

Wind speeds changed by

+1.6 km/h

These indicators show reduced climate volatility, offering a valuable window to reinforce sustainable practices and strengthen long-term climate resilience. As the severity shifts toward Moderate, it is important to maintain momentum in climate adaptation efforts.

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

Sundsvall Weather Forecast 30 Days (September - October 2025)
Sundsvall, Vasternorrland, Sweden

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Wed. 24, Sep.
partly cloudyPartly Cloudy
Temperature Icon12°/7°
Humidity Icon74%
Wind Icon25km/h
Thu. 25, Sep.
sunnySunny
Temperature Icon14°/5°
Humidity Icon74%
Wind Icon12km/h
Fri. 26, Sep.
partly cloudyPartly Cloudy
Temperature Icon15°/6°
Humidity Icon74%
Wind Icon7km/h
Sat. 27, Sep.
overcastOvercast
Temperature Icon15°/7°
Humidity Icon73%
Wind Icon6km/h
Sun. 28, Sep.
sunnySunny
Temperature Icon16°/6°
Humidity Icon76%
Wind Icon9km/h
Mon. 29, Sep.
sunnySunny
Temperature Icon17°/7°
Humidity Icon73%
Wind Icon10km/h
Tue. 30, Sep.
sunnySunny
Temperature Icon16°/7°
Humidity Icon77%
Wind Icon16km/h
Wed. 1, Oct.
partly cloudyPartly Cloudy
Temperature Icon15°/7°
Humidity Icon79%
Wind Icon15km/h
Thu. 2, Oct.
partly cloudyPartly Cloudy
Temperature Icon16°/7°
Humidity Icon81%
Wind Icon19km/h
Fri. 3, Oct.
moderate rainModerate rain
Temperature Icon13°/8°
Humidity Icon84%
Wind Icon27km/h
Sat. 4, Oct.
partly cloudyPartly Cloudy
Temperature Icon12°/6°
Humidity Icon73%
Wind Icon23km/h
Sun. 5, Oct.
partly cloudyPartly Cloudy
Temperature Icon10°/7°
Humidity Icon70%
Wind Icon22km/h
Mon. 6, Oct.
partly cloudyPartly Cloudy
Temperature Icon12°/7°
Humidity Icon69%
Wind Icon18km/h
Tue. 7, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/7°
Humidity Icon86%
Wind Icon15km/h
Wed. 8, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/4°
Humidity Icon83%
Wind Icon17km/h
Thu. 9, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/4°
Humidity Icon83%
Wind Icon17km/h
Fri. 10, Oct.
moderate rain at timesModerate rain at times
Temperature Icon8°/4°
Humidity Icon82%
Wind Icon14km/h
Sat. 11, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/3°
Humidity Icon83%
Wind Icon14km/h
Sun. 12, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon8°/3°
Humidity Icon81%
Wind Icon16km/h
Mon. 13, Oct.
moderate rain at timesModerate rain at times
Temperature Icon8°/2°
Humidity Icon80%
Wind Icon16km/h
Tue. 14, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon8°/3°
Humidity Icon82%
Wind Icon16km/h
Wed. 15, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon8°/2°
Humidity Icon78%
Wind Icon15km/h
Thu. 16, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/2°
Humidity Icon78%
Wind Icon17km/h
Fri. 17, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/2°
Humidity Icon82%
Wind Icon16km/h
Sat. 18, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon7°/2°
Humidity Icon82%
Wind Icon17km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/2°
Humidity Icon84%
Wind Icon16km/h
Mon. 20, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/1°
Humidity Icon84%
Wind Icon13km/h
Tue. 21, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon5°/1°
Humidity Icon81%
Wind Icon14km/h
Wed. 22, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/1°
Humidity Icon83%
Wind Icon16km/h
Thu. 23, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon5°/2°
Humidity Icon80%
Wind Icon17km/h
Fri. 24, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/2°
Humidity Icon83%
Wind Icon15km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 29, Sep.

16.9°C

Low will be onMon. 20, Oct.

0.9°C

HumidityHumidity

High will be onTue. 7, Oct.

86%

Low will be onMon. 6, Oct.

69%

Wind SpeedWind Speed

High will be onFri. 3, Oct.

27.4km/h

Low will be onSat. 27, Sep.

5.8km/h

PrecipitationPrecipitation

High will be onFri. 3, Oct.

5.3mm

Low will be onFri. 10, Oct.

0.7mm

Ultraviolet IndexUV

High will be onMon. 29, Sep.

4

Low will be onWed. 24, Sep.

0.3

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