The weather on Sunday October 1 will be exceptionally hot for the period, with maximum temperatures almost 10°C higher than seasonal norms across a large part of the country, according to Météo-France forecasts.
At daybreak, temperatures will generally be between 7 and 12°C over a large north-eastern quarter of the country up to the interior of Pays de la Loire and Auvergne, and between 12 and 17°C elsewhere. . During the day, maximum temperatures will be very much higher than seasonal values, excess of 7 to 9°C over a large part of the country, or even 10 to 11°C over a large south-western quarter.
At the hottest of the day, the thermometer will display 21 to 26°C near the English Channel and the northern borders of the country, 26 to 31°C over the rest of the northern half as far as Rhône-Alpes as well as the edge of the Mediterranean, 28 to 32°C elsewhere, and 32 to 34°C in the South-West.
Twentieth month in a row above normal
On Monday, the thermometer could approach 30°C in Burgundy-Franche-Comté, Alsace or Ile-de-France. Many monthly records are expected to be broken. “There could be anomalies beyond 10°C compared to seasonal norms,” Tristan Amm, forecaster at Météo-France, commented on Friday. This is a truly exceptional sequence for the end of September and the beginning of October. »
For now, the national heat record for the month of October is held by Ajaccio with 35°C on October 15, 1988, followed on the continent by Dax with 34.7°C on October 2, 1985.
“Historic”, “exceptional”… Météo-France experts are using superlatives to analyze this start of autumn. Because the upcoming episode follows the hottest month of September since records began in 1900. It will be the twentieth month in a row above seasonal norms, recorded in 2022 and now calculated over the period 1991- 2020. With an average of around 21.5°C, it is ahead of the Septembers of 1949 and 1961. But it will exceed them by more than 1°C, with an anomaly of 3.5 to 3.6°C.
