Rennes, Bretagne, France Climate Change Severity

38
Moderate
The current climate change severity in Rennes is Moderate, with a 16.9% 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 Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Rennes 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), Rennes temperature has changed by around +6.3%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
2827
-3.5%
cloudyCloudy
4728
-40.4%
rainyRainy
10795
-11.2%
snowySnowy
00
0%
mistyMisty
011
100%

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

Climate Change Indicators:

Over the past 15 years, Rennes 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, Rennes experienced significant changes:

Temperature change of

+0.7 °C

Variation in annual rainfall

+18.9 %

Change in average humidity

-4.8 %

PM2.5 levels surged by

-15.3 %

Heatwave changed by

-2.06 day(s)

Coldwave changed by

-3.1 day(s)

Wind speeds changed by

+1.2 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 Jul.

Rennes Weather Forecast 30 Days (August - September 2025)
Rennes, Bretagne, France

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Thu. 21, Aug.
sunnySunny
Temperature Icon25°/13°
Humidity Icon63%
Wind Icon22km/h
Fri. 22, Aug.
sunnySunny
Temperature Icon26°/11°
Humidity Icon62%
Wind Icon20km/h
Sat. 23, Aug.
sunnySunny
Temperature Icon28°/11°
Humidity Icon52%
Wind Icon13km/h
Sun. 24, Aug.
sunnySunny
Temperature Icon30°/13°
Humidity Icon44%
Wind Icon15km/h
Mon. 25, Aug.
partly cloudyPartly Cloudy
Temperature Icon33°/16°
Humidity Icon35%
Wind Icon19km/h
Tue. 26, Aug.
sunnySunny
Temperature Icon31°/16°
Humidity Icon52%
Wind Icon23km/h
Wed. 27, Aug.
sunnySunny
Temperature Icon27°/13°
Humidity Icon67%
Wind Icon19km/h
Thu. 28, Aug.
moderate rainModerate rain
Temperature Icon25°/12°
Humidity Icon70%
Wind Icon29km/h
Fri. 29, Aug.
moderate rainModerate rain
Temperature Icon21°/13°
Humidity Icon82%
Wind Icon35km/h
Sat. 30, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon21°/12°
Humidity Icon73%
Wind Icon32km/h
Sun. 31, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon16°/13°
Humidity Icon85%
Wind Icon28km/h
Mon. 1, Sep.
partly cloudyPartly Cloudy
Temperature Icon22°/12°
Humidity Icon76%
Wind Icon25km/h
Tue. 2, Sep.
partly cloudyPartly Cloudy
Temperature Icon22°/11°
Humidity Icon75%
Wind Icon12km/h
Wed. 3, Sep.
partly cloudyPartly Cloudy
Temperature Icon25°/12°
Humidity Icon68%
Wind Icon14km/h
Thu. 4, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon24°/14°
Humidity Icon75%
Wind Icon17km/h
Fri. 5, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon24°/14°
Humidity Icon74%
Wind Icon18km/h
Sat. 6, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon23°/13°
Humidity Icon74%
Wind Icon18km/h
Sun. 7, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon23°/13°
Humidity Icon71%
Wind Icon16km/h
Mon. 8, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/12°
Humidity Icon73%
Wind Icon17km/h
Tue. 9, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/14°
Humidity Icon76%
Wind Icon18km/h
Wed. 10, Sep.
moderate rain at timesModerate rain at times
Temperature Icon23°/13°
Humidity Icon77%
Wind Icon18km/h
Thu. 11, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon23°/12°
Humidity Icon74%
Wind Icon17km/h
Sat. 13, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/13°
Humidity Icon75%
Wind Icon18km/h
Sun. 14, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/12°
Humidity Icon74%
Wind Icon19km/h
Mon. 15, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/12°
Humidity Icon75%
Wind Icon16km/h
Tue. 16, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon21°/12°
Humidity Icon76%
Wind Icon18km/h
Wed. 17, Sep.
moderate rain at timesModerate rain at times
Temperature Icon22°/12°
Humidity Icon77%
Wind Icon19km/h
Thu. 18, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon21°/11°
Humidity Icon77%
Wind Icon19km/h
Fri. 19, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon21°/11°
Humidity Icon78%
Wind Icon17km/h
Sat. 20, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon21°/11°
Humidity Icon77%
Wind Icon17km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onMon. 25, Aug.

32.8°C

Low will be onFri. 22, Aug.

10.5°C

HumidityHumidity

High will be onSun. 31, Aug.

85%

Low will be onMon. 25, Aug.

35%

Wind SpeedWind Speed

High will be onFri. 29, Aug.

34.9km/h

Low will be onTue. 2, Sep.

11.9km/h

PrecipitationPrecipitation

High will be onFri. 29, Aug.

9.7mm

Low will be onThu. 21, Aug.

0.01mm

Ultraviolet IndexUV

High will be onTue. 26, Aug.

6

Low will be onMon. 25, Aug.

0.8

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