Weather in Rennes in August 2025
- August is usually the hottest month of the year in Rennes;
Average weather
Average temperature in Rennes in August
The expected average maximum temperature in August is +23°C with a maximum of +30°C and a minimum of +10°C.
The average maximum temperature goes up 10% by the end of the month, compared with the beginning of the month, from +20°C to +22°C.
Is Rennes warm or cold in August?
Rennes is typically warm in August.
Maximum temperatures go up compared to the previous month from +23°C to +23°C. The minimum temperature also goes down from +14°C to +13°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is the hottest month in Rennes, here is the comparison with other months:
Climate in Rennes in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +23°C | +23°C | +21°C | ||||
| Min. temperature | ||||||
| +7°C | +6°C | +3°C | ||||
| Max. temperature | ||||||
| +40°C | +38°C | +34°C | ||||
| Rainfall | ||||||
| 49 mm | 42 mm | 45 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 73% | 74% | 77% | ||||
| Air pressure | ||||||
| 1016 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 7 | 7 | 7 | ||||
| Cloudy days | ||||||
| 8 | 8 | 8 | ||||
| Rainy days | ||||||
| 14 | 14 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. The temperature levels stay the same in the area of +23°C for average maximum temperature during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 49 mm to 42 mm. Humidity rises from 73% to 74%. The average wind speed doesn’t change much during August, staying around 2 m/s. The amount of sunny days stay about the same, averaging 7 sunny days during the month.
Next month (September) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Rennes is gradually increasing during August, going from 4 m/s to 4 m/s over the course of the month.
Rain
How was the weather last August in Rennes?
Climate Change over Years
The climate in Rennes in August has not changed much over the last 43 years.
The average temperature was the lowest in 1986 (+14°C) and the highest in 2022 (+18°C). The driest year was 1996 with only 390 mm of rainfall, and the wettest year was 2000 with 878 mm.
FAQ
Is August a good time to visit Rennes?
Can you sunbathe in Rennes in August?
Is Rennes rainy in August?
Is it sunny in Rennes in August?
Other cities in France
Monthly weather in Rennes
Source of the data
For this page, we’ve looked at the typical weather in Rennes, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.