Summer heat will stick around across much of France on Sunday, with a handful of regional differences. Weather services expect the polar jet stream to wave overhead. Once that happens, temperatures could become noticeably cooler, with the timing of cooler air varying by area.

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