Rennes, France Climate & Monthly Averages
Rennes has an oceanic climate. July is the hottest month, averaging 76° by day; January is the coldest at 48°.
How weather changes through the year in Rennes
Rennes runs on a dry-summer rhythm: the warmest months are also the driest. July averages 1.7 inches (43 mm) while the wet season peaks in October at 3.4 inches (87 mm). Highs range from 48°F (9°C) to 76°F (24°C).
Rennes climate quick facts
- Hottest month: July - highs near 76°F (24°C)
- Coldest month: January - highs near 48°F (9°C)
- Decade extremes (2015-2024): 103°F (40°C) high · 20°F (-7°C) low
- Wettest month: October (11 rainy days) · Sunniest: July (11.7 h sun/day)
- Climate type: oceanic
- Annual swing: 13°C between the average warmest and coolest month · day to night: 8°C
- Average humidity: 79%
Temperatures, rain and sunshine
Precipitation concentrates in October - 3.4 inches (87 mm) on 11 days - and thins out by July. January bottoms out at 48°F (9°C) in daylight, 38°F (3°C) after dark. At its warmest, in July, Rennes runs to 76°F (24°C) in the afternoon and back to 58°F (14°C) by dawn. Four of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is June through September.
Relative humidity averages 79% across the year, more humid than roughly 80% of the cities we track. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 103°F (40°C) and the lowest daily minimum 20°F (-7°C).
Where Rennes sits among other climates
- Rennes sits close to the middle of our dataset on most measures: 54°F (12°C) as an annual average, 31.4 inches (798 mm) of precipitation and 8.2 hours of sun a day.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 48° | 38° | 13 | 2.8 in | 4.3 h/day | 8.8 h | 41% | 87% |
| February | 51° | 38° | 11 | 2.3 in | 5.7 h/day | 10.1 h | 40% | 82% |
| March | 54° | 41° | 14 | 2.7 in | 7.4 h/day | 11.7 h | 45% | 79% |
| April | 60° | 43° | 11 | 2.1 in | 10.0 h/day | 13.6 h | 35% | 73% |
| May | 66° | 49° | 12 | 2.5 in | 10.7 h/day | 15.2 h | 40% | 74% |
| June | 72° | 55° | 11 | 3.1 in | 11.5 h/day | 16.0 h | 36% | 74% |
| July | 76° | 58° | 9 | 1.7 in | 11.7 h/day | 15.7 h | 28% | 71% |
| August | 75° | 58° | 9 | 2.1 in | 10.8 h/day | 14.3 h | 30% | 73% |
| September | 70° | 54° | 10 | 2.4 in | 9.3 h/day | 12.5 h | 33% | 76% |
| October | 63° | 50° | 11 | 3.4 in | 7.0 h/day | 10.7 h | 37% | 82% |
| November | 54° | 44° | 13 | 3.1 in | 5.4 h/day | 9.2 h | 42% | 86% |
| December | 50° | 41° | 12 | 3.2 in | 4.3 h/day | 8.4 h | 40% | 88% |
Rennes month by month
Each card shows the average high and low. The bar places that month between Rennes's coldest night and warmest afternoon.
January
- Rain
- 13 days
- Sunshine
- 4.3 h
- Daylight
- 8.8 h
February
- Rain
- 11 days
- Sunshine
- 5.7 h
- Daylight
- 10.1 h
March
- Rain
- 14 days
- Sunshine
- 7.4 h
- Daylight
- 11.7 h
April
- Rain
- 11 days
- Sunshine
- 10.0 h
- Daylight
- 13.6 h
May
- Rain
- 12 days
- Sunshine
- 10.7 h
- Daylight
- 15.2 h
June
- Rain
- 11 days
- Sunshine
- 11.5 h
- Daylight
- 16.0 h
July
- Rain
- 9 days
- Sunshine
- 11.7 h
- Daylight
- 15.7 h
August
- Rain
- 9 days
- Sunshine
- 10.8 h
- Daylight
- 14.3 h
September
- Rain
- 10 days
- Sunshine
- 9.3 h
- Daylight
- 12.5 h
October
- Rain
- 11 days
- Sunshine
- 7.0 h
- Daylight
- 10.7 h
November
- Rain
- 13 days
- Sunshine
- 5.4 h
- Daylight
- 9.2 h
December
- Rain
- 12 days
- Sunshine
- 4.3 h
- Daylight
- 8.4 h
Looking for warmer alternatives? Browse warm places by month, or compare Rennes's coolest part of the year: January, December, February.
A season-by-season guide to Rennes
Spring (March through May)
Spring in Rennes is mild, with daytime highs averaging 60°F (16°C) and nights around 44°F (7°C); rain falls on around 37 of the 90 days.
Summer (June through August)
Through summer, Rennes settles into easy warmth: 74°F (24°C) by day, 57°F (14°C) after dark, and expect showers on roughly 29 days across the season. Daylight is generous - around 11.3 hours of sun a day.
Fall (September through November)
Fall in Rennes is mild, with daytime highs averaging 63°F (17°C) and nights around 49°F (10°C); rain falls on around 34 of the 90 days.
Winter (December through February)
Winter is chilly here - highs near 50°F (10°C), nights near 39°F (4°C), and rain falls on around 36 of the 90 days.
Questions people ask about Rennes's climate
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The most useful weather window for Rennes
Best time to visit Rennes
Aim for June to October and April if you get the choice: the dry season is running but the afternoons are still bearable, and highs average 69°F (21°C) against roughly 10 wet days a month. For the same question asked the other way round, see where else is warm in June.
What to pack
Pack for Rennes with a warm jacket and layers for the cooler season and a compact umbrella or rain shell. July nights average 58°F (14°C), so evenings rarely match the afternoons.
Rennes temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.