Rennes, Brittany Weather by Month and Climate Averages

How much rain does Rennes get?

Rennes gets 691 mm of precipitation in an average year, spread over about 184 days with measurable rain. That is more rainy days than 75% of France.

December is the wettest month, with 73 mm. August is the driest, with 43 mm. October has the most rainy days, about 19.

The longest dry spell in the last five years lasted 24 days, to August 12, 2022.

Rennes weather by month

Rennes weather in January

In January, Rennes averages a high of 9°C and a low of 3°C. It gets 67 mm of precipitation over about 17 rainy days. The sun is out about 25% of daylight hours. The January record high is 17°C (2022) and the record low is -14°C (1985).

Rennes weather in February

In February, Rennes averages a high of 10°C and a low of 3°C. It gets 52 mm of precipitation over about 15 rainy days. The sun is out about 28% of daylight hours. The February record high is 21°C (2019) and the record low is -11°C (1991).

Rennes weather in March

In March, Rennes averages a high of 13°C and a low of 4°C. It gets 49 mm of precipitation over about 14 rainy days. The sun is out about 35% of daylight hours. The March record high is 24°C (2021) and the record low is -7°C (2005).

Rennes weather in April

In April, Rennes averages a high of 16°C and a low of 6°C. It gets 51 mm of precipitation over about 14 rainy days. The sun is out about 40% of daylight hours. The April record high is 28°C (2026) and the record low is -3°C (1984).

Rennes weather in May

In May, Rennes averages a high of 19°C and a low of 9°C. It gets 58 mm of precipitation over about 14 rainy days. The sun is out about 38% of daylight hours. The May record high is 33°C (2026) and the record low is -1°C (2019). May is one of the most comfortable months to visit.

Rennes weather in June

In June, Rennes averages a high of 23°C and a low of 12°C. It gets 51 mm of precipitation over about 12 rainy days. The sun is out about 39% of daylight hours. The June record high is 42°C (2026) and the record low is 3°C (2006). June is one of the most comfortable months to visit.

Rennes weather in July

In July, Rennes averages a high of 25°C and a low of 14°C. It gets 44 mm of precipitation over about 13 rainy days. The sun is out about 42% of daylight hours. The July record high is 41°C (2022) and the record low is 6°C (1972). July is one of the most comfortable months to visit.

Rennes weather in August

In August, Rennes averages a high of 25°C and a low of 14°C. It gets 43 mm of precipitation over about 15 rainy days. The sun is out about 42% of daylight hours. The August record high is 39°C (2003) and the record low is 4°C (1986). August is one of the most comfortable months to visit.

Rennes weather in September

In September, Rennes averages a high of 22°C and a low of 12°C. It gets 57 mm of precipitation over about 16 rainy days. The sun is out about 41% of daylight hours. The September record high is 35°C (2023) and the record low is 2°C (1972). September is one of the most comfortable months to visit.

Rennes weather in October

In October, Rennes averages a high of 17°C and a low of 9°C. It gets 73 mm of precipitation over about 19 rainy days. The sun is out about 30% of daylight hours. The October record high is 30°C (2011) and the record low is -4°C (1997). October is one of the most comfortable months to visit.

Rennes weather in November

In November, Rennes averages a high of 13°C and a low of 6°C. It gets 73 mm of precipitation over about 19 rainy days. The sun is out about 32% of daylight hours. The November record high is 22°C (2015) and the record low is -6°C (1985).

Rennes weather in December

In December, Rennes averages a high of 9°C and a low of 4°C. It gets 73 mm of precipitation over about 17 rainy days. The sun is out about 23% of daylight hours. The December record high is 18°C (2015) and the record low is -8°C (2009).

Sunshine, humidity and wind in Rennes

July is the sunniest month in Rennes, with sunshine about 42% of daylight hours. December is the cloudiest, at 23%. Over the year the sun shines about 35% of daylight hours. Rennes is cloudier than 73% of France.

Humidity peaks in December at 89% and is lowest in July at 70%.

Rennes has about 5 days a year above 32°C. Rennes is cooler than 68% of France.

First and last freeze in Rennes

The first fall freeze in Rennes typically comes around November 16, and the last spring freeze around April 6. That leaves a frost-free growing season of about 224 days.

Rennes weather records

The hottest temperature on record at the Rennes station is 42°C, on June 23, 2026. The coldest is -14°C, on January 17, 1985.

The wettest day on record brought 70 mm of rain, on January 19, 1995.

38 all-time records have been set at the station since 1970.

The annual mean temperature has changed by +0.3°C per decade since 1970.

The best time to visit Rennes

The most comfortable time to visit is typically May to October, when daytime highs sit near 22°C.

Winter (December–February) is chilly, with average highs around 10°C and lows near 3°C.

Spring (March–May) is mild, with average highs around 16°C and lows near 7°C.

Summer (June–August) is warm, with average highs around 24°C and lows near 13°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 17°C and lows near 9°C.

Rennes climate questions

How much rain does Rennes get?

Rennes gets 691 mm of precipitation in an average year, over about 184 rainy days.

What is the wettest month in Rennes?

December is the wettest month in Rennes, with 73 mm. August is the driest, with 43 mm.

How many rainy days does Rennes have a year?

Rennes has about 184 days with measurable rain in an average year. October has the most, about 19.

What is the hottest month in Rennes?

July is the warmest month in Rennes, with an average high of 25°C.

What is the coldest month in Rennes?

February is the coldest month in Rennes, with an average low of 3°C.

What is the record high temperature in Rennes?

The record high at the Rennes station is 42°C, set on June 23, 2026. The record low is -14°C, on January 17, 1985.

What is the sunniest month in Rennes?

July is the sunniest month in Rennes, with sunshine about 42% of daylight hours. December is the cloudiest.

When is the first frost in Rennes?

The first fall freeze in Rennes typically comes around November 16. The last spring freeze is around April 6.

What is the best time to visit Rennes?

The most comfortable time to visit is typically May to October, when daytime highs sit near 22°C.