Hafnarfjordur, Reykjavik, Iceland Climate Change Severity

38
Moderate
The current climate change severity in Hafnarfjordur is Moderate, with a 20.6% 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)

Hafnarfjordur 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), Hafnarfjordur temperature has changed by around +13.8%, 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
1622
37.5%
cloudyCloudy
3927
-30.7%
rainyRainy
143115
-19.5%
snowySnowy
1216
33.3%
mistyMisty
00
0%

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

Climate Change Indicators:

Over the past 15 years, Hafnarfjordur has experienced measurable improvements in key climate parameters, contributing to the current severity score of 38 (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

38/100

Moderate

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Hafnarfjordur experienced significant changes:

Temperature change of

+0.7 °C

Variation in annual rainfall

+18.2 %

Change in average humidity

+0.9 %

PM2.5 levels surged by

+17.5 %

Heatwave changed by

+5.7 day(s)

Coldwave changed by

+0.1 day(s)

Wind speeds changed by

+0.8 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.

Hafnarfjordur Weather Forecast 30 Days (September - October 2025)
Hafnarfjordur, Reykjavik, Iceland

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Tue. 30, Sep.
moderate rainModerate rain
Temperature Icon10°/9°
Humidity Icon86%
Wind Icon48km/h
Wed. 1, Oct.
moderate rainModerate rain
Temperature Icon11°/8°
Humidity Icon86%
Wind Icon37km/h
Thu. 2, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon10°/8°
Humidity Icon79%
Wind Icon23km/h
Fri. 3, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/6°
Humidity Icon80%
Wind Icon19km/h
Sat. 4, Oct.
partly cloudyPartly Cloudy
Temperature Icon7°/4°
Humidity Icon72%
Wind Icon35km/h
Sun. 5, Oct.
overcastOvercast
Temperature Icon4°/1°
Humidity Icon65%
Wind Icon14km/h
Mon. 6, Oct.
overcastOvercast
Temperature Icon4°/1°
Humidity Icon73%
Wind Icon36km/h
Tue. 7, Oct.
partly cloudyPartly Cloudy
Temperature Icon3°/2°
Humidity Icon73%
Wind Icon37km/h
Wed. 8, Oct.
partly cloudyPartly Cloudy
Temperature Icon5°/2°
Humidity Icon71%
Wind Icon34km/h
Thu. 9, Oct.
partly cloudyPartly Cloudy
Temperature Icon6°/4°
Humidity Icon75%
Wind Icon10km/h
Fri. 10, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon7°/4°
Humidity Icon75%
Wind Icon9km/h
Sat. 11, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon7°/6°
Humidity Icon78%
Wind Icon30km/h
Sun. 12, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/7°
Humidity Icon84%
Wind Icon30km/h
Mon. 13, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon8°/6°
Humidity Icon83%
Wind Icon43km/h
Tue. 14, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/4°
Humidity Icon80%
Wind Icon29km/h
Wed. 15, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/4°
Humidity Icon81%
Wind Icon26km/h
Thu. 16, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/4°
Humidity Icon81%
Wind Icon24km/h
Fri. 17, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/4°
Humidity Icon83%
Wind Icon30km/h
Sat. 18, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon7°/3°
Humidity Icon82%
Wind Icon29km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/4°
Humidity Icon80%
Wind Icon31km/h
Mon. 20, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/3°
Humidity Icon81%
Wind Icon31km/h
Tue. 21, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/2°
Humidity Icon78%
Wind Icon28km/h
Wed. 22, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/2°
Humidity Icon80%
Wind Icon25km/h
Thu. 23, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/3°
Humidity Icon83%
Wind Icon23km/h
Fri. 24, Oct.
moderate rain at timesModerate rain at times
Temperature Icon5°/1°
Humidity Icon81%
Wind Icon23km/h
Sat. 25, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/1°
Humidity Icon82%
Wind Icon28km/h
Sun. 26, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/2°
Humidity Icon80%
Wind Icon27km/h
Mon. 27, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/2°
Humidity Icon77%
Wind Icon28km/h
Tue. 28, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon5°/2°
Humidity Icon81%
Wind Icon28km/h
Wed. 29, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/3°
Humidity Icon82%
Wind Icon28km/h
Thu. 30, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon6°/3°
Humidity Icon81%
Wind Icon30km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 1, Oct.

10.9°C

Low will be onMon. 6, Oct.

1.2°C

HumidityHumidity

High will be onTue. 30, Sep.

86%

Low will be onSun. 5, Oct.

65%

Wind SpeedWind Speed

High will be onTue. 30, Sep.

47.5km/h

Low will be onFri. 10, Oct.

9km/h

PrecipitationPrecipitation

High will be onTue. 30, Sep.

13.3mm

Low will be onTue. 7, Oct.

0.01mm

Ultraviolet IndexUV

High will be onSat. 4, Oct.

3

Low will be onWed. 1, Oct.

0.1

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