Climate averages 1991–2020
Rennes weather
in May.
A mild, moderately wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Rennes: daytime highs average 18.1°C and nights cool to about 9.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 63 mm of rain on roughly 11 days, which makes May a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 09 min on an average May day.
The nearest other city in this atlas is Nantes (100 km away). In May its highs average 18.4°C, about as warm as Rennes, with 61 mm of rain.
Among the 57 cities listed in France, Rennes ranks joint 43rd of 57 for the warmest May highs and joint 22nd of 57 for the driest May (rainfall, lowest first). The mean May high of those 57 cities is 18.9°C; Rennes is 0.9°C cooler than that mean.
From May to June, average highs rise by 3.1°C to 21.2°C, and monthly rainfall falls from 63 mm to 53 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rennes climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.4°C3.3°C | 3.3°C | 64 | 11.2 | 8.89 h |
| February | 9.4°C2.9°C | 2.9°C | 53 | 9.9 | 10.210 h |
| March | 12.2°C4.6°C | 4.6°C | 52 | 10.5 | 11.912 h |
| April | 14.9°C6.3°C | 6.3°C | 58 | 11.1 | 13.614 h |
| May, selected | 18.1°C9.5°C | 9.5°C | 63 | 10.8 | 15.215 h |
| June | 21.2°C12.4°C | 12.4°C | 53 | 9.0 | 16.016 h |
| July | 23.1°C14.2°C | 14.2°C | 46 | 7.8 | 15.616 h |
| August | 23.2°C14.3°C | 14.3°C | 46 | 8.2 | 14.314 h |
| September | 20.5°C12.2°C | 12.2°C | 49 | 8.2 | 12.613 h |
| October | 16.3°C9.7°C | 9.7°C | 69 | 11.4 | 10.911 h |
| November | 11.8°C6.2°C | 6.2°C | 65 | 11.3 | 9.39 h |
| December | 8.8°C3.7°C | 3.7°C | 71 | 12.1 | 8.48 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Nantes in MayFrance · 100 kmHigh 18.4°C · Low 10.3°C · 61 mm rain
- Angers in MayFrance · 110 kmHigh 18.7°C · Low 10.0°C · 62 mm rain
- Saint Helier in MayJersey · 124 kmHigh 13.7°C · Low 11.0°C · 53 mm rain
- Le Mans in MayFrance · 140 kmHigh 18.4°C · Low 9.6°C · 63 mm rain
- Caen in MayFrance · 154 kmHigh 17.3°C · Low 9.4°C · 58 mm rain
- Tours in MayFrance · 195 kmHigh 19.1°C · Low 10.2°C · 66 mm rain
- Le Havre in MayFrance · 202 kmHigh 16.1°C · Low 10.1°C · 59 mm rain
- Brest, France in MayFrance · 210 kmHigh 15.0°C · Low 10.6°C · 59 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rennes) is explained once on the Rennes year overview and on the Sources, method and limits page.