When the sun sets, a second city life begins in Rennes.
During the day, the streets shimmer with heat and the exterior walls of the buildings in the capital of Brittany absorb heat like hot plates, while in the evening hundreds of people gather in the parks. Families spread out mats on the grass, teenagers sit laughing under the old chestnut trees, and the elderly enjoy a cool breeze. Some stay until midnight. Not for romance, but because the indoors are almost unbearable.
Rennes is experiencing unusually high temperatures at an unusually early time of year, temperatures usually expected only in midsummer. During the day, it rises up to 36 degrees, and the temperature barely drops due to tropical nights — this situation makes many French people uneasy. Especially in Brittany, this is even more so. In the past, sweating problems were mainly considered a holiday issue in the southern regions.
Now the city is responding with seemingly simple but new reality-based measures: parks and green spaces remain open at night.
Particularly popular is Parc du Thabor, which usually closes in the evening. Now, people sit on benches or on the grass late into the night. One visitor describes the open green space as “really like royalty.” Others express more calmly, “At least there is some air here.”
That is exactly the point.
Modern cities store heat like a fever sponge. Asphalt, concrete, and densely packed streets only release heat hours later. People living in high-rise buildings or attics know this feeling well: the house feels like an oven left slightly open at night. Sleep? Forget about it.
Especially elderly people, children, pregnant women, and seniors living alone quickly reach physical limits in such temperatures. Authorities therefore no longer see the nighttime opening of parks as merely a summer idea but recognize it as part of health protection.
Rennes is not the only city facing this problem. In many French cities, climate change is already changing daily life. Public drinking fountains, extended swimming pool hours, square misting systems, and new shade creation plans have become basic facilities to cope with the heat in many places. This may sound technical but directly affects people’s everyday lives.
Parks have suddenly come to be seen not just as pretty green spaces between buildings but as essential shelters for survival.
Cities are expanding this so-called network of “cool islands”. These are places with trees, waterfront spaces, and plants that can noticeably lower the surrounding temperature. Walking through hot evenings in Rennes, you can feel the difference within dozens of meters. In the canyon of heated streets, shaded parks almost feel like a different climate zone.
Who would have imagined a few years ago that at the end of May, people would stay in Brittany Park at night to escape the heat? Today, this scene has suddenly become everyday life.
To be honest, this brings more fear to many French people than any weather app.
Written by C. Hatty