{"id":9002,"date":"2026-09-04T11:52:31","date_gmt":"2026-09-04T09:52:31","guid":{"rendered":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/le-4-septembre-2026-a-9h52-apres-pres-de-40c-lautomne-pourrait-brutalement-sinstaller-en-france\/"},"modified":"2026-09-04T11:52:31","modified_gmt":"2026-09-04T09:52:31","slug":"le-4-septembre-2026-a-9h52-apres-pres-de-40c-lautomne-pourrait-brutalement-sinstaller-en-france","status":"publish","type":"post","link":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/le-4-septembre-2026-a-9h52-apres-pres-de-40c-lautomne-pourrait-brutalement-sinstaller-en-france\/","title":{"rendered":"le 4 septembre 2026 \u00e0 9h52 Apr\u00e8s pr\u00e8s de 40\u00b0C, l\u2019automne pourrait brutalement s\u2019installer en France"},"content":{"rendered":"

M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Lire la Suite<\/a><\/p>\n

\"\"<\/h1>\n

\u00a0<\/h1>\n

De 38\u00b0C \u00e0 20\u00b0C : l\u2019automne va brutalement s\u2019imposer en France<\/h1>\n

Apr\u00e8s des temp\u00e9ratures proches de 40\u00b0C ce week-end, la situation m\u00e9t\u00e9o va radicalement changer en France. D\u00e8s le milieu de la semaine prochaine, les temp\u00e9ratures pourraient perdre 10 \u00e0 15\u00b0C et passer sous les normales saisonni\u00e8res. Plus remarquable encore : cette s\u00e9quence tr\u00e8s fra\u00eeche et beaucoup plus humide pourrait se prolonger au-del\u00e0 de la semaine prochaine.<\/p>\n

Alors qu\u2019une nouvelle pouss\u00e9e de chaleur exceptionnelle concerne la France en cette fin de semaine, avec une vigilance orange canicule d\u00e9clench\u00e9e dans plusieurs d\u00e9partements du sud, l\u2019atmosph\u00e8re pourrait basculer dans l\u2019exc\u00e8s inverse quelques jours seulement plus tard.<\/p>\n

Et contrairement \u00e0 un simple rafra\u00eechissement passager, les derni\u00e8res projections du mod\u00e8le europ\u00e9en envisagent d\u00e9sormais une p\u00e9riode fra\u00eeche et perturb\u00e9e susceptible de s\u2019installer durant plusieurs jours.<\/p>\n

\u00a0<\/p>\n

Pr\u00e8s de 40\u00b0C dimanche dans le Sud-Ouest<\/h2>\n

La chaleur va encore s\u2019accentuer au cours du week-end et devrait culminer dimanche 6 septembre, notamment dans le Sud-Ouest.<\/p>\n

Selon nos derni\u00e8res pr\u00e9visions, les temp\u00e9ratures maximales pourraient atteindre 37 \u00e0 38\u00b0C dans le Sud-Ouest<\/strong>, avec 35 \u00e0 36\u00b0C sur une grande partie de l\u2019Aquitaine et du Midi<\/strong>.<\/p>\n

La chaleur gagnera \u00e9galement une grande partie du pays avec 33 \u00e0 34\u00b0C dans le Centre<\/strong>, 31\u00b0C \u00e0 Paris<\/strong> et souvent 29 \u00e0 32\u00b0C entre la Bretagne, le Bassin parisien et le Grand Est<\/strong>.<\/p>\n

La masse d\u2019air sera elle aussi exceptionnellement chaude pour un d\u00e9but de mois de septembre. Le mod\u00e8le europ\u00e9en pr\u00e9voit dimanche des temp\u00e9ratures situ\u00e9es tr\u00e8s largement au-dessus des normales vers 1500 m\u00e8tres d\u2019altitude, avec localement des anomalies sup\u00e9rieures \u00e0 +10\u00b0C<\/strong>.<\/p>\n

\"\"<\/p>\n

La chaleur devrait culminer dimanche 6 septembre, avec jusqu\u2019\u00e0 37 \u00e0 38\u00b0C dans le Sud-Ouest et plus de 30\u00b0C sur une grande partie de la France.<\/em><\/p>\n

\u00a0<\/p>\n

Quatre jours plus tard, parfois \u00e0 peine 20\u00b0C<\/h2>\n

Le contraste avec la deuxi\u00e8me partie de la semaine prochaine pourrait \u00eatre spectaculaire.<\/p>\n

Une descente d\u2019air beaucoup plus frais en provenance de l\u2019Atlantique et du nord-ouest de l\u2019Europe devrait progressivement chasser la masse d\u2019air subtropicale.<\/p>\n

D\u00e8s jeudi 10 septembre, les temp\u00e9ratures maximales pourraient ne plus atteindre que 19 \u00e0 23\u00b0C sur une grande partie de la France<\/strong>.<\/p>\n

On passerait ainsi approximativement de 31\u00b0C dimanche \u00e0 21\u00b0C jeudi \u00e0 Paris<\/strong>, de 38\u00b0C \u00e0 24\u00b0C dans le Sud-Ouest<\/strong>, ou encore de 34 \u00e0 35\u00b0C \u00e0 seulement 19 \u00e0 22\u00b0C dans certaines r\u00e9gions du Centre et de l\u2019Ouest<\/strong>.<\/p>\n

En seulement quatre jours, la baisse pourrait donc atteindre 10 \u00e0 15\u00b0C<\/strong>, voire ponctuellement davantage.<\/p>\n

Seules les r\u00e9gions m\u00e9diterran\u00e9ennes et la Corse conserveraient des temp\u00e9ratures encore proches de 26 \u00e0 29\u00b0C<\/strong>.<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

Jeudi 10 septembre, les temp\u00e9ratures maximales pourraient ne plus d\u00e9passer 19 \u00e0 24\u00b0C sur une grande partie de la France.<\/em><\/p>\n

\u00a0<\/h2>\n

Apr\u00e8s l\u2019exc\u00e8s chaud, l\u2019exc\u00e8s inverse ?<\/h2>\n

Le plus remarquable n\u2019est pas seulement la chute des temp\u00e9ratures.<\/p>\n

Les derni\u00e8res simulations du mod\u00e8le europ\u00e9en indiquent qu\u2019\u00e0 partir du milieu de la semaine prochaine, la France pourrait passer sous les normales saisonni\u00e8res<\/strong>.<\/p>\n

Sur une grande partie du pays, les temp\u00e9ratures seraient alors inf\u00e9rieures de 2 \u00e0 5\u00b0C aux moyennes habituelles<\/strong>, avec localement un d\u00e9ficit encore plus important.<\/p>\n

Autrement dit, certaines r\u00e9gions pourraient passer en quelques jours seulement d\u2019une chaleur exceptionnelle pour un d\u00e9but septembre \u00e0 une ambiance nettement trop fra\u00eeche pour la saison.<\/p>\n

Ce v\u00e9ritable basculement d\u2019un extr\u00eame \u00e0 l\u2019autre constituerait l\u2019une des \u00e9volutions m\u00e9t\u00e9o les plus marquantes de ce d\u00e9but d\u2019automne m\u00e9t\u00e9orologique.<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

Apr\u00e8s l\u2019exc\u00e8s de chaleur du week-end, les temp\u00e9ratures pourraient basculer sous les normales d\u00e8s le milieu de la semaine prochaine.<\/em><\/p>\n

\u00a0<\/p>\n

Le plus \u00e9tonnant : cette fra\u00eecheur pourrait durer<\/h2>\n

Les derni\u00e8res cartes vont m\u00eame plus loin.<\/p>\n

Le rafra\u00eechissement ne serait pas n\u00e9cessairement limit\u00e9 \u00e0 deux ou trois journ\u00e9es. Le mod\u00e8le europ\u00e9en continue de faire circuler de l\u2019air frais sur une grande partie de l\u2019Europe occidentale jusqu\u2019aux alentours du 17 septembre<\/strong>.<\/p>\n

\u00c0 cette \u00e9ch\u00e9ance, les anomalies de temp\u00e9ratures resteraient encore n\u00e9gatives sur une grande partie de la France.<\/p>\n

Il convient \u00e9videmment de rester prudent \u00e0 pr\u00e8s de deux semaines d\u2019\u00e9ch\u00e9ance : les d\u00e9tails de la situation \u00e9volueront encore fortement. Mais ce signal n\u2019est pas isol\u00e9. Les pr\u00e9visions d\u2019ensemble, qui regroupent plusieurs dizaines de sc\u00e9narios possibles, vont elles aussi majoritairement dans le sens d\u2019un rafra\u00eechissement durable apr\u00e8s le milieu de la semaine prochaine. L\u2019exemple de Paris illustre bien cette tendance, avec peu de sc\u00e9narios envisageant un retour rapide \u00e0 des temp\u00e9ratures comparables \u00e0 celles de ce week-end.<\/strong><\/p>\n

La r\u00e9p\u00e9tition de ce signal sur plusieurs \u00e9ch\u00e9ances renforce donc l\u2019hypoth\u00e8se d\u2019un changement de r\u00e9gime plus durable, avec des temp\u00e9ratures souvent inf\u00e9rieures aux normales et une ambiance plus perturb\u00e9e.<\/p>\n

Nous pourrions ainsi passer, en l\u2019espace de quelques jours, d\u2019un \u00e9pisode caniculaire exceptionnel \u00e0 une p\u00e9riode franchement automnale susceptible de se prolonger jusqu\u2019\u00e0 la mi-septembre.<\/strong><\/p>\n

\u00a0<\/p>\n

Avec un retour marqu\u00e9 des pluies<\/h2>\n

Cette fra\u00eecheur pourrait \u00e9galement s\u2019accompagner d\u2019un changement radical concernant les pr\u00e9cipitations.<\/p>\n

Les projections du mod\u00e8le europ\u00e9en jusqu\u2019au dimanche 13 septembre envisagent des cumuls atteignant fr\u00e9quemment 20 \u00e0 50 mm sur une grande partie de la France<\/strong>, avec parfois 50 \u00e0 80 mm<\/strong>, voire davantage sur certains reliefs ou sous les passages pluvieux les plus actifs.<\/p>\n

Apr\u00e8s un \u00e9t\u00e9 2026 exceptionnellement chaud et souvent tr\u00e8s sec, le contraste serait donc particuli\u00e8rement marqu\u00e9.<\/p>\n

Le milieu du mois de septembre pourrait ainsi offrir une m\u00e9t\u00e9o presque \u00e0 l\u2019oppos\u00e9 de celle observ\u00e9e ce week-end : beaucoup moins chaude, plus humide, plus perturb\u00e9e et parfois franchement automnale<\/strong>.<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

D\u2019ici au 13 septembre, plusieurs dizaines de millim\u00e8tres de pluie pourraient tomber sur une grande partie du pays, confirmant un changement profond de r\u00e9gime m\u00e9t\u00e9o.<\/em><\/p>\n

\u00a0<\/p>\n

Auteur : Guillaume S\u00e9chet >>><\/a><\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>","protected":false},"excerpt":{"rendered":"

M\u00e9t\u00e9o\u00a0 Republi\u00e9 via Innoreader Lire la Suite \u00a0 De 38\u00b0C \u00e0 20\u00b0C : l\u2019automne va brutalement s\u2019imposer en France Apr\u00e8s des temp\u00e9ratures proches de 40\u00b0C […]<\/p>\n","protected":false},"author":1,"featured_media":9003,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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