Rennes, Bretagne, France Climate Change Severity

67
Very High
The current climate change severity in Rennes is Very High, with a 48.06% 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

Rennes 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), Rennes temperature has changed by around +18.06%, 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
2859
110.7%
cloudyCloudy
4616
-65.2%
rainyRainy
10687
-17.9%
snowySnowy
03
100%
mistyMisty
15
400%

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

Climate Change Indicators:

Over the past 16 years, Rennes 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

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2026, Rennes experienced significant changes:

Temperature change of

+2.04 °C

Variation in annual rainfall

+7.53 %

Change in average humidity

-7.19 %

PM2.5 levels surged by

-32.37 %

Heatwave changed by

+19 Days

Coldwave changed by

-3 Days

Wind speeds changed by

+3.69 km/h

These indicators show a dramatic increase in volatility and worsening conditions. Rennes'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.

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

Rennes Weather Forecast 30 Days (August - September 2026)
Rennes, Bretagne, France

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Thu. 13, Aug.
sunnySunny
Temperature Icon40°/19°
Humidity Icon34%
Wind Icon25.9km/h
Fri. 14, Aug.
sunnySunny
Temperature Icon33°/17°
Humidity Icon63%
Wind Icon27.7km/h
Sat. 15, Aug.
sunnySunny
Temperature Icon30°/17°
Humidity Icon70%
Wind Icon25.9km/h
Sun. 16, Aug.
sunnySunny
Temperature Icon30°/13°
Humidity Icon60%
Wind Icon29.9km/h
Mon. 17, Aug.
sunnySunny
Temperature Icon28°/12°
Humidity Icon58%
Wind Icon24.5km/h
Tue. 18, Aug.
sunnySunny
Temperature Icon32°/14°
Humidity Icon69%
Wind Icon23km/h
Wed. 19, Aug.
sunnySunny
Temperature Icon33°/17°
Humidity Icon70%
Wind Icon25.9km/h
Thu. 20, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon26°/14°
Humidity Icon77%
Wind Icon23.8km/h
Fri. 21, Aug.
patchy rain possibleRain Possible
Temperature Icon24°/14°
Humidity Icon72%
Wind Icon15.6km/h
Sat. 22, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon25°/14°
Humidity Icon73%
Wind Icon17.1km/h
Sun. 23, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon25°/14°
Humidity Icon73%
Wind Icon16.8km/h
Mon. 24, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/14°
Humidity Icon73%
Wind Icon19.9km/h
Tue. 25, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/14°
Humidity Icon74%
Wind Icon21.3km/h
Wed. 26, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon24°/14°
Humidity Icon76%
Wind Icon20.1km/h
Thu. 27, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon76%
Wind Icon19.4km/h
Fri. 28, Aug.
moderate rain at timesRain
Temperature Icon24°/13°
Humidity Icon73%
Wind Icon18.8km/h
Sat. 29, Aug.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon74%
Wind Icon19.1km/h
Sun. 30, Aug.
heavy rain at timesHeavy Rain
Temperature Icon22°/12°
Humidity Icon75%
Wind Icon16km/h
Mon. 31, Aug.
heavy rain at timesHeavy Rain
Temperature Icon23°/12°
Humidity Icon73%
Wind Icon17.8km/h
Tue. 1, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon75%
Wind Icon16.8km/h
Wed. 2, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon23°/12°
Humidity Icon74%
Wind Icon15.8km/h
Thu. 3, Sep.
heavy rain at timesHeavy Rain
Temperature Icon24°/13°
Humidity Icon74%
Wind Icon18.4km/h
Fri. 4, Sep.
heavy rain at timesHeavy Rain
Temperature Icon24°/13°
Humidity Icon75%
Wind Icon17km/h
Sat. 5, Sep.
heavy rain at timesHeavy Rain
Temperature Icon23°/13°
Humidity Icon74%
Wind Icon16.8km/h
Sun. 6, Sep.
heavy rain at timesHeavy Rain
Temperature Icon23°/13°
Humidity Icon72%
Wind Icon17.8km/h
Mon. 7, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon72%
Wind Icon17.2km/h
Tue. 8, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon23°/12°
Humidity Icon74%
Wind Icon17.8km/h
Wed. 9, Sep.
moderate or heavy rain showerRain Showers
Temperature Icon23°/13°
Humidity Icon75%
Wind Icon18.9km/h
Thu. 10, Sep.
moderate rain at timesRain
Temperature Icon23°/13°
Humidity Icon78%
Wind Icon18.9km/h
Fri. 11, Sep.
heavy rain at timesHeavy Rain
Temperature Icon22°/12°
Humidity Icon74%
Wind Icon17.8km/h
Sat. 12, Sep.
moderate rain at timesRain
Temperature Icon22°/12°
Humidity Icon74%
Wind Icon18km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onThu. 13, Aug.

40°C

Low will be onMon. 17, Aug.

12°C

HumidityHumidity

High will be onThu. 10, Sep.

78%

Low will be onThu. 13, Aug.

34%

Wind SpeedWind Speed

High will be onSun. 16, Aug.

29.9km/h

Low will be onFri. 21, Aug.

15.6km/h

PrecipitationPrecipitation

High will be onTue. 25, Aug.

3.06mm

Low will be onFri. 21, Aug.

0.4mm

Ultraviolet IndexUV

High will be onTue. 18, Aug.

8

Low will be onFri. 21, Aug.

4

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