Summer heat will linger across large parts of France on Sunday, with a handful of regional differences. Forecasters expect the polar jet stream to wave overhead. Following that change, temperatures could become noticeably cooler, with cooler air timing differing by region.

Regional forecasts keep pointing to ongoing warmth in parts of the south. Some spots will keep summer conditions longer, while others may see the cooler air arrive sooner. Exactly when it arrives depends on location.