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Rennes, Brittany Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Rennes, Brittany?
Rennes, Brittany gets 691 mm of precipitation a year over about 184 rainy days. July is the warmest month (average high 25°C) and February the coldest (average low 3°C).
Oceanic climate
Rennes, Brittany has warm summers and chilly winters. Daytime highs range from about 9°C in January to 25°C in July. December is usually the wettest month. The most comfortable time to visit is typically May to October, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 3° | 9° |
| Spring | Mar–May | 7° | 16° |
| Summer | Jun–Aug | 13° | 24° |
| Autumn | Sep–Nov | 9° | 17° |
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.
From October 2025 to September 2026 Rennes got 624 mm of rain, against a normal of 691 mm for those months. January 2026 had the most, with 123 mm.
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. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The August record high is 40°C (2026) 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. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 42% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 23%. The annual cloud-cover estimate is 35% of daylight hours; it is not a measurement of sunshine duration. 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
These records cover RENNES-ST JACQUES during 1970–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 70 mm of precipitation, 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 3° | 9° | 67 mm | 17 | 88% | 25% | 17° | -14° |
| February | 3° | 10° | 52 mm | 15 | 83% | 28% | 21° | -11° |
| March | 4° | 13° | 49 mm | 14 | 76% | 35% | 24° | -7° |
| April | 6° | 16° | 51 mm | 14 | 71% | 40% | 28° | -3° |
| May | 9° | 19° | 58 mm | 14 | 71% | 38% | 33° | -1° |
| June | 12° | 23° | 51 mm | 12 | 72% | 39% | 42° | 3° |
| July | 14° | 25° | 44 mm | 13 | 70% | 42% | 41° | 6° |
| August | 14° | 25° | 43 mm | 15 | 73% | 42% | 40° | 4° |
| September | 12° | 22° | 57 mm | 16 | 77% | 41% | 35° | 2° |
| October | 9° | 17° | 73 mm | 19 | 84% | 30% | 30° | -4° |
| November | 6° | 13° | 73 mm | 19 | 88% | 32% | 22° | -6° |
| December | 4° | 9° | 73 mm | 17 | 89% | 23% | 18° | -8° |
Station: RENNES-ST JACQUES, 6 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
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?
Within the available 1970–2026 station history, 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 estimated sunshine of 42% of daylight hours from ERA5 cloud cover. 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.
Climate for places near Rennes, Brittany
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