Summer heat will remain across most of France on Sunday, with a few local exceptions. Meteorologists expect the polar jet stream to undulate overhead. Following that change, temperatures may turn noticeably cooler, with the arrival time for cooler air varying by location.

Regional forecasts still point to ongoing warmth in parts of the south. Some spots will keep summer conditions longer, while some spots could get the cooler air ahead of the rest. Exactly when it arrives hinges on the area.