Temperature drops: up to 15 degrees lower at the end of the week

After the heat peaks affecting much of the country between Monday and Tuesday, the first true freshness of fall Meteorology looms this weekend. Big changes in temperature are a regular phenomenon in September, but after a long, hot summer, it may be surprising to find temperature levels not seen since last spring.

After breaking monthly heat records on Monday in the Southwest with as much as 39°C locally in the shade, temperatures will eventually drop dramatically in the second half of the week. The coming weekend will be very refreshing and in some areas we will lose up to 15°C in a few days.

Creation of a northern flow leads to lower temperatures from Thursday

From Monday to Wednesday, France is under the influence of an extensive low pressure system that stretches from Portugal to the Bay of Biscay. The general flow is southward and very hot air comes out of North Africa. This Monday is the hottest day but temperatures, although slightly cooler, will still be well above normal for this season. It should be noted that the high temperature peak occurred at the same time only two years ago at 37.8°C on 14 September in Dax.

Credit: The Weather Channel

From Thursday, an anticyclone will re-inflate over the British Isles while a depression will form between Scandinavia and Central Europe. Between these two systems, a northern flow will occur over France and significantly lower temperatures. The decline will begin Thursday in the northern half before generalizing to the entire country on Friday. The coming weekend will be cold with temperatures not exceeding 15 to 19 degrees Celsius in the afternoon over the greater northern half and 20 to 27 degrees Celsius in the southern part of the country. We will then be 3 to 4 degrees Celsius below average for the season. It will feel very refreshing and exposed to the north wind. In the Mediterranean, the miral and the tramontane will explode strongly.