Rennes climate
Rennes is warmest in August, with average highs of 23 °C, and coldest in February, when nights average 2.8 °C. December is the wettest month (74 mm) and July the driest (46 mm). Figures are 1991–2020 climate normals.
Across a full year Rennes averages 703 mm of rain, 26 days above 25 °C and 26 days below freezing.
France · population 227,830 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month August 23 °C
- Coldest month February 2.8 °C
- Driest month July 46 mm
- Wettest month December 74 mm
- Least cloud July 58 % cloud
- Hottest on record July 36 °C
- Coldest on record February -9.7 °C
What to expectRennes through the year
Rennes has a clear annual cycle: average daily highs run from 9.4 °C in February to 23 °C in August, a swing of 13 °C in mean temperature across the year.
Counted across a normal year, 26 days a year reach 25 °C, 3 of them reach 30 °C, 26 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in July.
Rain is spread fairly evenly through the year, from 46 mm in July to 74 mm in December. There is no dry season to aim for.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 8.5 °C | 66 mm | 74 % |
| February | 9.4 °C | 54 mm | 69 % |
| March | 12.2 °C | 53 mm | 67 % |
| April | 14.9 °C | 58 mm | 63 % |
| May | 18.1 °C | 64 mm | 64 % |
| June | 21.2 °C | 53 mm | 61 % |
| July | 23.1 °C | 46 mm | 58 % |
| August | 23.2 °C | 48 mm | 58 % |
| September | 20.5 °C | 50 mm | 59 % |
| October | 16.3 °C | 70 mm | 69 % |
| November | 11.8 °C | 67 mm | 71 % |
| December | 8.8 °C | 74 mm | 71 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 8.5 °C | 3.1 °C | 5.8 °C | 15.9 °C | -9.4 °C | 0 | 0 | 7 |
| February | 9.4 °C | 2.8 °C | 6.0 °C | 19.1 °C | -9.7 °C | 0 | 0 | 7 |
| March | 12.2 °C | 4.4 °C | 8.2 °C | 21.6 °C | -5.3 °C | 0 | 0 | 3 |
| April | 14.9 °C | 6.1 °C | 10.5 °C | 26.1 °C | -1.5 °C | 0 | 0 | 0 |
| May | 18.1 °C | 9.4 °C | 13.8 °C | 29.1 °C | 1.8 °C | 1 | 0 | 0 |
| June | 21.2 °C | 12.2 °C | 16.8 °C | 34.3 °C | 4.9 °C | 5 | 1 | 0 |
| July | 23.1 °C | 14.0 °C | 18.6 °C | 36.4 °C | 8.2 °C | 9 | 1 | 0 |
| August | 23.2 °C | 14.2 °C | 18.6 °C | 36.3 °C | 8.4 °C | 8 | 1 | 0 |
| September | 20.5 °C | 12.0 °C | 16.1 °C | 31.6 °C | 5.3 °C | 3 | 0 | 0 |
| October | 16.3 °C | 9.6 °C | 12.8 °C | 26.9 °C | -2.7 °C | 0 | 0 | 0 |
| November | 11.8 °C | 6.1 °C | 8.8 °C | 19.4 °C | -4.6 °C | 0 | 0 | 2 |
| December | 8.8 °C | 3.6 °C | 6.2 °C | 15.7 °C | -6.7 °C | 0 | 0 | 7 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 66 mm | 11 | 8.8 h/day | 74 % | 86 % | 21 km/h |
| February | 54 mm | 10 | 10 h/day | 69 % | 83 % | 21 km/h |
| March | 53 mm | 11 | 12 h/day | 67 % | 79 % | 20 km/h |
| April | 58 mm | 11 | 14 h/day | 63 % | 75 % | 19 km/h |
| May | 64 mm | 11 | 15 h/day | 64 % | 74 % | 18 km/h |
| June | 53 mm | 9 | 16 h/day | 61 % | 73 % | 18 km/h |
| July | 46 mm | 8 | 16 h/day | 58 % | 72 % | 17 km/h |
| August | 48 mm | 8 | 14 h/day | 58 % | 74 % | 17 km/h |
| September | 50 mm | 8 | 13 h/day | 59 % | 76 % | 17 km/h |
| October | 70 mm | 11 | 11 h/day | 69 % | 82 % | 19 km/h |
| November | 67 mm | 11 | 9.3 h/day | 71 % | 86 % | 20 km/h |
| December | 74 mm | 12 | 8.4 h/day | 71 % | 87 % | 21 km/h |
How Rennes compares
The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.
| Destination | Summer high | Winter low | Rain per year | Days above 25 °C |
|---|---|---|---|---|
| Rennes | 23 °C | 2.8 °C | 703 mm | 26 |
| Nantes · France | 24 °C | 3.3 °C | 721 mm | 33 |
| Angers · France | 24 °C | 2.7 °C | 666 mm | 38 |
| Saint Helier · Jersey | 19 °C | 6.2 °C | 995 mm | 1 |
| Saint Peter Port · Guernsey | 17 °C | 7.1 °C | 876 mm | 0 |
| Le Havre · France | 22 °C | 3.2 °C | 931 mm | 15 |
Where Rennes ranks
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in Europe in July | 10thof 50 | 91/100 |
| Places with the best weather in Europe in August | 35thof 50 | 90/100 |
Planning a trip? See the best time to visit Rennes.
QuestionsCommon questions about Rennes’s climate
When is the best time to visit Rennes?
That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, August is the warmest month and July the driest. The month-by-month table above has the full picture.
How hot does Rennes get?
In August, the warmest month, daily highs average 23 °C. About 3 days a year pass 30 °C. The highest value in the 1991–2020 record is 36 °C.
How cold does it get in winter?
Nights average 2.8 °C in February, the coldest month. A normal year has 26 nights below freezing.
Which month is wettest in Rennes?
December, averaging 74 mm over 12 days with rain. The driest month is July with 46 mm. The year as a whole averages 703 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Rennes rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.