Summer heat will stick around across large parts of France on Sunday, with a handful of regional differences. Forecasters expect the polar jet stream to wave overhead. Once that happens, temperatures may turn noticeably cooler, with the arrival time for cooler air varying by location.

Regional forecasts still point to more warm weather in parts of the south. Some areas will hold on to the warmth, with other places turning cooler earlier. Exactly when it arrives varies by place.