Summer heat will stick around across large parts of France on Sunday, with a few local exceptions. Forecasters expect the polar jet stream to wave overhead. Once that happens, temperatures may turn noticeably cooler, with the timing of cooler air varying by area.

Regional forecasts still point to more warm weather in parts of the south. Some spots will hold on to the warmth, while some spots could get the cooler air ahead of the rest. The local outcome depends on location.