Summer heat will stick around across large parts of France on Sunday, with a few local exceptions. Forecasters expect the polar jet stream to undulate overhead. Once that happens, temperatures could become noticeably cooler, with the arrival time for cooler air varying by location.
Regional forecasts keep pointing to ongoing warmth in parts of the south. Some areas will hold on to the warmth, while some spots could get the cooler air ahead of the rest. The exact change depends on location.