{"id":61058,"date":"2026-07-28T10:12:30","date_gmt":"2026-07-28T08:12:30","guid":{"rendered":"https:\/\/alertes-meteo.com\/?page_id=61058"},"modified":"2026-07-28T11:20:25","modified_gmt":"2026-07-28T09:20:25","slug":"ecart-a-la-moyenne-des-temperatures-en-septembre-depuis-1921-en-france-un-debut-dautomne-de-plus-en-plus-doux","status":"publish","type":"page","link":"https:\/\/alertes-meteo.com\/index.php\/climatologie\/ecart-a-la-moyenne-des-temperatures-en-septembre-depuis-1921-en-france-un-debut-dautomne-de-plus-en-plus-doux\/","title":{"rendered":"\u00c9cart \u00e0 la moyenne des temp\u00e9ratures en septembre depuis 1921 en France : un d\u00e9but d’automne de plus en plus doux"},"content":{"rendered":"

\u00c9cart \u00e0 la moyenne des temp\u00e9ratures en septembre<\/b><\/h1>\n

Le mois de septembre<\/strong> marque le d\u00e9but de l’automne m\u00e9t\u00e9orologique. Longtemps caract\u00e9ris\u00e9 par une baisse progressive des temp\u00e9ratures apr\u00e8s l’\u00e9t\u00e9, il conna\u00eet aujourd’hui une \u00e9volution notable. Les relev\u00e9s m\u00e9t\u00e9orologiques r\u00e9alis\u00e9s depuis 1921 montrent que les temp\u00e9ratures moyennes de septembre augmentent progressivement en France. Les \u00e9carts \u00e0 la moyenne deviennent de plus en plus souvent positifs, confirmant une prolongation des conditions estivales et l’influence du r\u00e9chauffement climatique.<\/p>\n

Une hausse des temp\u00e9ratures qui prolonge l’\u00e9t\u00e9<\/h2>\n

Des anomalies positives de plus en plus fr\u00e9quentes<\/h3>\n

L’\u00e9cart \u00e0 la moyenne des temp\u00e9ratures<\/strong>, \u00e9galement appel\u00e9 anomalie thermique, mesure la diff\u00e9rence entre la temp\u00e9rature moyenne observ\u00e9e et la normale climatique de r\u00e9f\u00e9rence.<\/p>\n

Entre 1921 et les ann\u00e9es 1980, les mois de septembre alternaient r\u00e9guli\u00e8rement entre anomalies positives et n\u00e9gatives. Depuis plusieurs d\u00e9cennies, les temp\u00e9ratures sup\u00e9rieures aux normales deviennent largement majoritaires. Certains mois de septembre comptent d\u00e9sormais parmi les plus chauds jamais observ\u00e9s en France, avec des p\u00e9riodes de chaleur parfois comparables \u00e0 celles du c\u0153ur de l’\u00e9t\u00e9.<\/p>\n

Quels sont les impacts de ce r\u00e9chauffement ?<\/h3>\n

L’augmentation des temp\u00e9ratures en septembre entra\u00eene plusieurs cons\u00e9quences :<\/p>\n

    \n
  • une prolongation des p\u00e9riodes de chaleur apr\u00e8s l’\u00e9t\u00e9 ;<\/li>\n
  • une augmentation de la fr\u00e9quence des \u00e9pisodes de chaleur tardifs ;<\/li>\n
  • un allongement de la saison de croissance de certaines cultures ;<\/li>\n
  • une persistance du risque de s\u00e9cheresse dans plusieurs r\u00e9gions ;<\/li>\n
  • une \u00e9volution des cycles biologiques de la faune et de la flore.<\/li>\n<\/ul>\n

    Cette tendance influence \u00e9galement le tourisme, les ressources en eau et la demande \u00e9nerg\u00e9tique.<\/p>\n<\/div>\n

    \n
    \n

    \u00c9cart \u00e0 la moyenne des temp\u00e9ratures en septembre depuis 1921 (France)<\/h2>\n

    Normale de r\u00e9f\u00e9rence 1991-2020<\/p>\n <\/div>\n\n

    \n Cliquez sur une barre pour afficher l\u2019ann\u00e9e et l\u2019\u00e9cart \u00e0 la normale.\n <\/div>\n\n
    \n
    \n \n Anomalies de temp\u00e9rature en septembre en France, de 1921 \u00e0 2025<\/title>\n <desc id=\"sep-desc\">\n Histogramme des \u00e9carts \u00e0 la normale 1991-2020. Les valeurs positives sont rouges\n et les valeurs n\u00e9gatives sont bleues. Chaque barre est interactive.\n <\/desc>\n <\/svg>\n <div class=\"sep-tooltip\" data-sep-tooltip role=\"status\" aria-hidden=\"true\"><\/div>\n <\/div>\n <\/div>\n\n <div class=\"sep-legend\" aria-label=\"L\u00e9gende\">\n <span><i class=\"sep-dot sep-dot-positive\"><\/i> Plus chaud que la normale<\/span>\n <span><i class=\"sep-dot sep-dot-negative\"><\/i> Plus froid que la normale<\/span>\n <\/div>\n\n <p class=\"sep-note\">Septembre 2026 n\u2019a pas encore commenc\u00e9 : il n\u2019est pas inclus dans l\u2019histogramme.<\/p>\n <p class=\"sep-source\">\n Sources : M\u00e9t\u00e9o-France (valeur 2025) \u2022 Normale climatologique 1991-2020\n <\/p>\n<\/div>\n\n<style>\n .sep-widget,\n .sep-widget * {\n box-sizing: border-box;\n }\n\n .sep-widget {\n --sep-red: #e85236;\n --sep-blue: #5c9ae3;\n --sep-grid: #dfe4ea;\n --sep-ink: #17202a;\n --sep-muted: #59636e;\n width: 100%;\n max-width: 1180px;\n margin: 24px auto;\n padding: clamp(18px, 3vw, 32px);\n overflow: hidden;\n color: var(--sep-ink);\n background: #ffffff;\n border: 1px solid #e8ebef;\n border-radius: 18px;\n box-shadow: 0 12px 34px rgba(23, 32, 42, 0.09);\n font-family: Arial, Helvetica, sans-serif;\n }\n\n .sep-header h2 {\n margin: 0;\n font-size: clamp(21px, 2.6vw, 31px);\n line-height: 1.18;\n letter-spacing: -0.02em;\n }\n\n .sep-header p {\n margin: 8px 0 0;\n color: var(--sep-muted);\n font-size: 15px;\n }\n\n .sep-selection {\n min-height: 49px;\n margin: 20px 0 12px;\n padding: 12px 15px;\n color: #34404c;\n background: #f5f7fa;\n border-left: 4px solid #8995a3;\n border-radius: 9px;\n font-size: 15px;\n line-height: 1.4;\n }\n\n .sep-selection strong {\n color: var(--sep-ink);\n }\n\n .sep-selection.is-positive {\n background: #fff3f0;\n border-left-color: var(--sep-red);\n }\n\n .sep-selection.is-negative {\n background: #eff6ff;\n border-left-color: var(--sep-blue);\n }\n\n .sep-selection.is-neutral {\n background: #f5f7fa;\n border-left-color: #707b86;\n }\n\n .sep-scroll {\n width: 100%;\n overflow-x: auto;\n overflow-y: hidden;\n scrollbar-color: #aeb7c2 #edf0f3;\n scrollbar-width: thin;\n -webkit-overflow-scrolling: touch;\n }\n\n .sep-stage {\n position: relative;\n width: 100%;\n min-width: 900px;\n }\n\n .sep-svg {\n display: block;\n width: 100%;\n height: auto;\n overflow: visible;\n touch-action: pan-x pan-y;\n }\n\n .sep-grid-line {\n stroke: var(--sep-grid);\n stroke-width: 1;\n vector-effect: non-scaling-stroke;\n }\n\n .sep-zero-line {\n stroke: #1c2732;\n stroke-width: 1.7;\n vector-effect: non-scaling-stroke;\n }\n\n .sep-y-label,\n .sep-x-label,\n .sep-axis-unit {\n fill: #68727d;\n font-family: Arial, Helvetica, sans-serif;\n }\n\n .sep-y-label {\n font-size: 13px;\n text-anchor: end;\n dominant-baseline: middle;\n }\n\n .sep-x-label {\n font-size: 11px;\n text-anchor: middle;\n }\n\n .sep-axis-unit {\n font-size: 12px;\n font-weight: 700;\n }\n\n .sep-bar {\n cursor: pointer;\n outline: none;\n }\n\n .sep-bar-visible {\n transition: opacity 0.14s ease, filter 0.14s ease;\n shape-rendering: geometricPrecision;\n }\n\n .sep-bar:hover .sep-bar-visible,\n .sep-bar:focus .sep-bar-visible,\n .sep-bar.is-selected .sep-bar-visible {\n opacity: 1;\n filter: brightness(0.83);\n }\n\n .sep-bar:focus-visible .sep-bar-visible {\n stroke: #111820;\n stroke-width: 2;\n vector-effect: non-scaling-stroke;\n }\n\n .sep-hit-area {\n fill: transparent;\n pointer-events: all;\n }\n\n .sep-tooltip {\n position: absolute;\n z-index: 4;\n width: max-content;\n max-width: 235px;\n padding: 10px 12px;\n color: #ffffff;\n background: rgba(18, 25, 33, 0.96);\n border-radius: 9px;\n box-shadow: 0 8px 24px rgba(0, 0, 0, 0.22);\n font-size: 13px;\n line-height: 1.35;\n pointer-events: none;\n opacity: 0;\n transform: translate(-50%, calc(-100% - 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25,\n class: \"sep-x-label\"\n });\n label.textContent = year;\n labelsGroup.appendChild(label);\n });\n svg.appendChild(labelsGroup);\n\n svg.addEventListener(\"click\", (event) => {\n if (event.target === svg || event.target.classList.contains(\"sep-grid-line\")) {\n removeSelection();\n hideTooltip();\n }\n });\n });\n })();\n<\/script><div class=\"fusion-text fusion-text-2\"><p><a href=\"https:\/\/alertes-meteo.com\/index.php\/climatologie\/ecart-a-la-moyenne-des-temperatures-en-aout-depuis-1921-en-france-un-mois-dete-toujours-plus-chaud\/\"><strong>Pour le mois de ao\u00fbt<\/strong><\/a><\/p>\n<p style=\"text-align: right;\"><a href=\"https:\/\/alertes-meteo.com\/index.php\/climatologie\/ecart-a-la-moyenne-des-temperatures-en-octobre-depuis-1921-en-france-un-automne-qui-se-rechauffe-durablement\/\"><strong>Pour le mois d’octobre<\/strong><\/a><\/p>\n<\/div><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8902396130105212\"\n crossorigin=\"anonymous\"><\/script>\n<!-- bas de page -->\n<ins class=\"adsbygoogle\"\n style=\"display:block\"\n data-ad-client=\"ca-pub-8902396130105212\"\n data-ad-slot=\"7724440717\"\n data-ad-format=\"auto\"\n data-full-width-responsive=\"true\"><\/ins>\n<script>\n (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><div class=\"fusion-text fusion-text-3\"><h2>Comment interpr\u00e9ter un \u00e9cart \u00e0 la moyenne ?<\/h2>\n<p class=\"isSelectedEnd\">Une anomalie positive signifie que la temp\u00e9rature moyenne du mois de septembre est sup\u00e9rieure \u00e0 la normale climatique. Cela n’emp\u00eache pas l’arriv\u00e9e de perturbations automnales, de journ\u00e9es fra\u00eeches ou d’\u00e9pisodes pluvieux.<\/p>\n<p class=\"isSelectedEnd\">\u00c0 l’inverse, une anomalie n\u00e9gative correspond \u00e0 un mois globalement plus frais que la moyenne, une situation devenue moins fr\u00e9quente depuis plusieurs d\u00e9cennies.<\/p>\n<h2>FAQ<\/h2>\n<h3>Que repr\u00e9sente une anomalie de temp\u00e9rature en septembre ?<\/h3>\n<p class=\"isSelectedEnd\">Il s’agit de la diff\u00e9rence entre la temp\u00e9rature moyenne observ\u00e9e durant le mois et la normale climatique de r\u00e9f\u00e9rence.<\/p>\n<h3>Pourquoi septembre devient-il plus chaud ?<\/h3>\n<p class=\"isSelectedEnd\">Cette \u00e9volution est li\u00e9e au r\u00e9chauffement climatique, qui favorise une augmentation des temp\u00e9ratures moyennes tout au long de l’ann\u00e9e, y compris en d\u00e9but d’automne.<\/p>\n<h3>Les fortes chaleurs sont-elles encore possibles en septembre ?<\/h3>\n<p class=\"isSelectedEnd\">Oui. Les \u00e9pisodes de chaleur tardifs sont devenus plus fr\u00e9quents et peuvent parfois atteindre des niveaux remarquables.<\/p>\n<h3>Depuis quand cette tendance est-elle visible ?<\/h3>\n<p class=\"isSelectedEnd\">Les anomalies positives deviennent nettement plus fr\u00e9quentes \u00e0 partir des ann\u00e9es 1980 et se renforcent depuis le d\u00e9but du XXI\u1d49 si\u00e8cle.<\/p>\n<h3>Quels secteurs sont les plus concern\u00e9s ?<\/h3>\n<p class=\"isSelectedEnd\">L’agriculture, les ressources en eau, les \u00e9cosyst\u00e8mes, le tourisme et la sant\u00e9 publique figurent parmi les domaines les plus impact\u00e9s.<\/p>\n<h2>Conclusion<\/h2>\n<p class=\"isSelectedEnd\">L’\u00e9volution des temp\u00e9ratures en septembre depuis 1921 confirme une tendance nette au r\u00e9chauffement en France. Les \u00e9carts positifs \u00e0 la moyenne deviennent de plus en plus fr\u00e9quents, prolongeant les conditions estivales bien apr\u00e8s la fin de l’\u00e9t\u00e9. Cette \u00e9volution illustre les transformations climatiques observ\u00e9es depuis plus d’un si\u00e8cle.<\/p>\n<h2>Consultez nos analyses climatiques<\/h2>\n<p>Explorez nos graphiques climatiques, nos statistiques m\u00e9t\u00e9o, nos <a href=\"https:\/\/alertes-meteo.com\/index.php\/2026\/07\/27\/previsions-saisonnieres\/\">pr\u00e9visions saisonni\u00e8res<\/a> et nos analyses d\u00e9taill\u00e9es pour suivre l’\u00e9volution des temp\u00e9ratures en France et mieux comprendre les grandes tendances du climat.<\/p>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":61059,"parent":60843,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_seopress_titles_title":"\u00c9cart \u00e0 la moyenne des temp\u00e9ratures en septembre en France depuis 1921 : \u00e9volution et anomalies climatiques","_seopress_titles_desc":"Analysez l'\u00e9volution des temp\u00e9ratures en septembre en France depuis 1921 et d\u00e9couvrez les \u00e9carts \u00e0 la moyenne qui illustrent le r\u00e9chauffement climatique.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"temperature mer","footnotes":""},"class_list":["post-61058","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/61058","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/comments?post=61058"}],"version-history":[{"count":5,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/61058\/revisions"}],"predecessor-version":[{"id":61096,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/61058\/revisions\/61096"}],"up":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/pages\/60843"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/media\/61059"}],"wp:attachment":[{"href":"https:\/\/alertes-meteo.com\/index.php\/wp-json\/wp\/v2\/media?parent=61058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}