Rennes, Bretagne, France Climate Change Severity

71
Very High
The current climate change severity in Rennes is Very High, with a 57.1% 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 Aug. (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 +16.7%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
3275
134.3%
cloudyCloudy
5317
-67.9%
rainyRainy
12090
-25%
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 71 (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

71/100

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

+4.08 %

Change in average humidity

-8.53 %

PM2.5 levels surged by

-29.74 %

Heatwave changed by

+21 Days

Coldwave changed by

-3 Days

Wind speeds changed by

+4.21 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 Aug.

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

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Wed. 30, Sep.
overcastOvercast
Temperature Icon23°/16°
Humidity Icon70%
Wind Icon31.7km/h
Thu. 1, Oct.
sunnySunny
Temperature Icon21°/12°
Humidity Icon71%
Wind Icon14.4km/h
Fri. 2, Oct.
sunnySunny
Temperature Icon22°/11°
Humidity Icon62%
Wind Icon13km/h
Sat. 3, Oct.
overcastOvercast
Temperature Icon22°/13°
Humidity Icon59%
Wind Icon15.1km/h
Sun. 4, Oct.
sunnySunny
Temperature Icon25°/13°
Humidity Icon59%
Wind Icon12.2km/h
Mon. 5, Oct.
sunnySunny
Temperature Icon24°/14°
Humidity Icon73%
Wind Icon9.4km/h
Tue. 6, Oct.
overcastOvercast
Temperature Icon22°/14°
Humidity Icon63%
Wind Icon19.8km/h
Wed. 7, Oct.
overcastOvercast
Temperature Icon17°/9°
Humidity Icon63%
Wind Icon15.8km/h
Thu. 8, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon19°/12°
Humidity Icon80%
Wind Icon18.2km/h
Fri. 9, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon19°/11°
Humidity Icon79%
Wind Icon17.2km/h
Sat. 10, Oct.
moderate rain at timesRain
Temperature Icon19°/10°
Humidity Icon78%
Wind Icon17.9km/h
Sun. 11, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon18°/10°
Humidity Icon79%
Wind Icon19.3km/h
Mon. 12, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon18°/10°
Humidity Icon78%
Wind Icon20.1km/h
Tue. 13, Oct.
heavy rain at timesHeavy Rain
Temperature Icon18°/9°
Humidity Icon81%
Wind Icon20.1km/h
Wed. 14, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon17°/9°
Humidity Icon80%
Wind Icon17.2km/h
Thu. 15, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/9°
Humidity Icon79%
Wind Icon19.3km/h
Fri. 16, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon18°/9°
Humidity Icon81%
Wind Icon20.7km/h
Sat. 17, Oct.
heavy rain at timesHeavy Rain
Temperature Icon17°/9°
Humidity Icon79%
Wind Icon17.9km/h
Sun. 18, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon17°/10°
Humidity Icon81%
Wind Icon19.8km/h
Mon. 19, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon17°/10°
Humidity Icon82%
Wind Icon22.2km/h
Tue. 20, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon17°/10°
Humidity Icon83%
Wind Icon23.7km/h
Wed. 21, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/9°
Humidity Icon82%
Wind Icon23.7km/h
Thu. 22, Oct.
heavy rain at timesHeavy Rain
Temperature Icon16°/9°
Humidity Icon81%
Wind Icon18.6km/h
Fri. 23, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/9°
Humidity Icon83%
Wind Icon22.6km/h
Sat. 24, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon17°/10°
Humidity Icon86%
Wind Icon21.9km/h
Sun. 25, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/9°
Humidity Icon83%
Wind Icon18.6km/h
Mon. 26, Oct.
heavy rain at timesHeavy Rain
Temperature Icon16°/8°
Humidity Icon81%
Wind Icon20km/h
Tue. 27, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/9°
Humidity Icon83%
Wind Icon21.9km/h
Wed. 28, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon15°/9°
Humidity Icon81%
Wind Icon20.5km/h
Thu. 29, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/9°
Humidity Icon82%
Wind Icon19.6km/h
Fri. 30, Oct.
moderate or heavy rain showerRain Showers
Temperature Icon16°/8°
Humidity Icon83%
Wind Icon17.9km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSun. 4, Oct.

25°C

Low will be onMon. 26, Oct.

8°C

HumidityHumidity

High will be onSat. 24, Oct.

86%

Low will be onSat. 3, Oct.

59%

Wind SpeedWind Speed

High will be onWed. 30, Sep.

31.7km/h

Low will be onMon. 5, Oct.

9.4km/h

PrecipitationPrecipitation

High will be onMon. 19, Oct.

4.3mm

Low will be onMon. 5, Oct.

0.01mm

Ultraviolet IndexUV

High will be onSun. 4, Oct.

6

Low will be onThu. 8, Oct.

3

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