Rennes Temperature by Month
The average annual maximum temperature in Rennes, Brittany, France is 17°C (63°F), with daytime highs ranging from 10°C (50°F) in February to 25°C (77°F) in July. This page covers monthly averages, day-night differences, and how Rennes compares to cities worldwide.
Rennes Monthly Temperatures
With significant temperature fluctuations, Rennes enjoys distinct seasons year-round. Nighttime lows range from 14°C (57°F) in July to 3°C (37°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Rennes by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 212 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Rennes vs France
The map below shows the annual temperature across France. You can also select individual months if you want to compare a specific time of year.
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Rennes vs World: Temperature Compared
Rennes's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
What Does the Temperature Feel Like in Rennes?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Rennes, February is the coolest month, with average highs of 11°C (52°F) and humidity around 83% — considered very high. In July, the warmest month, temperatures average 25°C (77°F) with 75% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Rennes's weather — including monthly rainfall, sunshine hours, and humidity — visit our Rennes climate page.
