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Weather by month

Rennes Weather by Month

Average temperatures, rainfall and humidity for Rennes, France, month by month, built from OpenWeather’s historical records. Use it to see what a typical Rennes month looks like before you travel — then check the live Rennes forecast for the days ahead.

Warmest month

July

25°C average high

Coolest month

January

3°C average low

Wettest month

January

69 mm of rain

Driest month

July

27 mm of rain

Average temperature and rainfall in Rennes by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

Month	Avg high	Avg low	Record low / high	Rainfall	Humidity	Wind
January	9°C	3°C	-11°C / 15°C	69 mm	89%	14 km/h
February	10°C	4°C	-6°C / 21°C	63 mm	83%	15 km/h
March	13°C	5°C	-4°C / 24°C	49 mm	79%	15 km/h
April	16°C	6°C	-4°C / 28°C	45 mm	73%	13 km/h
May	19°C	9°C	0°C / 34°C	50 mm	74%	13 km/h
June	23°C	12°C	5°C / 44°C	41 mm	73%	12 km/h
July	25°C	14°C	6°C / 40°C	27 mm	71%	13 km/h
August	24°C	14°C	6°C / 39°C	39 mm	73%	11 km/h
September	22°C	12°C	5°C / 34°C	30 mm	77%	11 km/h
October	17°C	9°C	-1°C / 30°C	55 mm	84%	13 km/h
November	13°C	6°C	-3°C / 20°C	59 mm	87%	13 km/h
December	10°C	4°C	-7°C / 18°C	52 mm	89%	14 km/h

Best time to visit Rennes

The most comfortable time to visit Rennes is generally June to August, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around January, totalling about 579 mm a year.

Travellers who prefer heat should aim for July, when highs average 25°C. January is the month to avoid if rain would spoil your plans — it averages 69 mm, roughly 3× the rainfall of the driest month (July).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Rennes forecast for what is happening now.