{"id":9042,"date":"2026-09-06T23:44:16","date_gmt":"2026-09-06T21:44:16","guid":{"rendered":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/le-6-septembre-2026-a-21h44-septembre-1987-letonnante-vague-de-chaleur-qui-precede-la-grande-bascule-climatique\/"},"modified":"2026-09-06T23:44:16","modified_gmt":"2026-09-06T21:44:16","slug":"le-6-septembre-2026-a-21h44-septembre-1987-letonnante-vague-de-chaleur-qui-precede-la-grande-bascule-climatique","status":"publish","type":"post","link":"https:\/\/meteo-sain-bel.fr\/wp\/blog\/le-6-septembre-2026-a-21h44-septembre-1987-letonnante-vague-de-chaleur-qui-precede-la-grande-bascule-climatique\/","title":{"rendered":"le 6 septembre 2026 \u00e0 21h44 Septembre 1987 : l\u2019\u00e9tonnante vague de chaleur qui pr\u00e9c\u00e8de la grande bascule climatique"},"content":{"rendered":"

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

\"\"<\/h1>\n

Septembre 1987 : quand la chaleur annonce la grande bascule du climat fran\u00e7ais<\/h1>\n

En janvier 1987, Paris grelotte sous -13\u00b0C et la neige recouvre presque toute la France. En juillet, la fra\u00eecheur domine encore souvent. Puis, quelques semaines plus tard, les temp\u00e9ratures atteignent soudainement 38\u00b0C en plein mois de septembre. Pr\u00e8s de quarante ans apr\u00e8s, cette \u00e9tonnante ann\u00e9e 1987 appara\u00eet comme une v\u00e9ritable charni\u00e8re : c\u2019est pr\u00e9cis\u00e9ment \u00e0 la fin des ann\u00e9es 1980 que les courbes de temp\u00e9ratures fran\u00e7aises commencent \u00e0 s\u2019envoler.<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

1987 commence dans un froid exceptionnel<\/h2>\n

\u00a0<\/p>\n

Pour comprendre \u00e0 quel point la vague de chaleur de septembre 1987 est \u00e9tonnante, il faut revenir quelques mois en arri\u00e8re.<\/p>\n

L\u2019ann\u00e9e avait commenc\u00e9 dans des conditions radicalement oppos\u00e9es.<\/p>\n

Entre le 10 et le 22 janvier 1987<\/strong>, une puissante vague de froid venue du nord-est de l\u2019Europe envahit la France. Le 12 janvier, les temp\u00e9ratures deviennent parfois polaires : on rel\u00e8ve -22\u00b0C \u00e0 Mulhouse, -20\u00b0C \u00e0 Ch\u00e2teau-Chinon, -16\u00b0C au Puy, -13\u00b0C \u00e0 Paris et m\u00eame -10\u00b0C \u00e0 Marseille<\/strong>.<\/p>\n

Dans l\u2019apr\u00e8s-midi, le thermom\u00e8tre reste bloqu\u00e9 \u00e0 -15\u00b0C \u00e0 Langres, -12\u00b0C \u00e0 Grenoble et -9\u00b0C \u00e0 Paris<\/strong>.<\/p>\n

Quelques jours plus tard, la neige recouvre une grande partie du territoire. Il tombe une dizaine de centim\u00e8tres jusque dans Paris, tandis que le Languedoc conna\u00eet une v\u00e9ritable temp\u00eate de neige. Dans la capitale, les -10\u00b0C observ\u00e9s en pleine journ\u00e9e<\/strong> emp\u00eachent m\u00eame le sel de faire correctement fondre la neige sur les chauss\u00e9es.<\/p>\n

Le froid ne dispara\u00eet r\u00e9ellement qu’au d\u00e9but du mois de f\u00e9vrier. Il revient ensuite \u00e0 plusieurs reprises : de nouvelles chutes de neige concernent la France en f\u00e9vrier, des gel\u00e9es persistent sur la moiti\u00e9 nord d\u00e9but mars et, ph\u00e9nom\u00e8ne aujourd’hui devenu exceptionnel, des flocons se m\u00ealent encore \u00e0 la pluie sur la moiti\u00e9 nord au d\u00e9but du mois de mai<\/strong>.<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

En janvier 1987, une vague de froid exceptionnelle recouvre une grande partie de la France de neige. \u00c0 Paris, les temp\u00e9ratures descendent jusqu’\u00e0 -13\u00b0C et restent parfois proches de -10\u00b0C en pleine journ\u00e9e.<\/em><\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

M\u00eame l’\u00e9t\u00e9 reste longtemps h\u00e9sitant<\/h2>\n

\u00a0<\/p>\n

L’arriv\u00e9e de l’\u00e9t\u00e9 ne marque pas franchement le d\u00e9but d’une p\u00e9riode durablement chaude.<\/p>\n

Le mois de juin est notamment marqu\u00e9 par le violent coup de galerne du 7 juin<\/strong>, avec des rafales d\u00e9passant localement 120 km\/h dans le Sud-Ouest.<\/p>\n

Puis juillet 1987 se montre g\u00e9n\u00e9ralement frais, notamment sur la moiti\u00e9 nord de la France<\/strong>. Le 17 juillet, le temps prend m\u00eame des allures automnales : pluie, temp\u00e9ratures dignes d’un mois d’octobre et violente temp\u00eate sur la moiti\u00e9 nord.<\/p>\n

La chaleur fait certes plusieurs apparitions au cours du mois d’ao\u00fbt. Du 13 au 16 ao\u00fbt, les temp\u00e9ratures atteignent 35 \u00e0 39\u00b0C sur la moiti\u00e9 sud<\/strong>, puis une nouvelle pouss\u00e9e chaude gagne \u00e9galement les r\u00e9gions septentrionales autour du 21 ao\u00fbt.<\/p>\n

Mais l\u00e0 encore, le changement est brutal.<\/p>\n

Les 24 et 25 ao\u00fbt<\/strong>, l’automne semble soudain s’installer : il tombe 85 mm de pluie en 24 heures \u00e0 Paris<\/strong> et les maximales du 25 ao\u00fbt plafonnent \u00e0 seulement 12\u00b0C \u00e0 Rouen, 13\u00b0C \u00e0 Saint-Quentin et Beauvais et 14\u00b0C \u00e0 Paris<\/strong>.<\/p>\n

\u00c0 la fin du mois d’ao\u00fbt, personne ne peut donc r\u00e9ellement imaginer que l’\u00e9pisode de chaleur le plus durable de l’\u00e9t\u00e9\u2026 reste encore \u00e0 venir.<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

Puis 38\u00b0C en plein mois de septembre<\/h2>\n

\u00a0<\/p>\n

Tout change brutalement quelques semaines plus tard.<\/p>\n

Du 13 au 21 septembre 1987<\/strong>, une vague de chaleur s’installe sur une grande partie de la France.<\/p>\n

Et il ne s’agit pas d’un simple \u00e9pisode de douceur tardive.<\/p>\n

Les temp\u00e9ratures atteignent des niveaux remarquables pour la saison : 38\u00b0C \u00e0 Auch, 37\u00b0C \u00e0 Saint-Girons, Clermont-Ferrand et Bordeaux, 36\u00b0C \u00e0 Saint-\u00c9tienne et encore 35\u00b0C \u00e0 Bourges<\/strong>.<\/p>\n

Cette vague de chaleur dure plus d’une semaine et constitue m\u00eame la plus longue s\u00e9quence chaude de l’\u00e9t\u00e9 1987<\/strong>, alors qu’elle intervient pratiquement \u00e0 l’approche de l’automne.<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

Du 13 au 21 septembre 1987, une remarquable vague de chaleur touche la France. Les temp\u00e9ratures atteignent 38\u00b0C \u00e0 Auch, 37\u00b0C \u00e0 Bordeaux et Clermont-Ferrand ou encore 35\u00b0C \u00e0 Bourges. Carte des temp\u00e9ratures maximales au cours de la journ\u00e9e du 17 septembre 1987. Infoclimat.fr<\/em><\/p>\n

\u00a0<\/p>\n

\u00c0 l’\u00e9poque, cet \u00e9pisode appara\u00eet avant tout comme une extraordinaire anomalie m\u00e9t\u00e9orologique.<\/p>\n

Mais pr\u00e8s de quarante ans plus tard, il prend une tout autre dimension.<\/p>\n

Car lorsque l’on observe l’\u00e9volution des temp\u00e9ratures fran\u00e7aises sur plusieurs d\u00e9cennies, 1987 se situe pr\u00e9cis\u00e9ment \u00e0 proximit\u00e9 d’une rupture spectaculaire<\/strong>.<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

La France venait-elle de changer de climat ?<\/h2>\n

\u00a0<\/p>\n

Il serait \u00e9videmment faux de dire que le r\u00e9chauffement climatique a commenc\u00e9 en septembre 1987.<\/p>\n

Le ph\u00e9nom\u00e8ne \u00e9tait d\u00e9j\u00e0 engag\u00e9 auparavant et r\u00e9sulte d’une \u00e9volution climatique mondiale sur le long terme.<\/p>\n

En revanche, la fin des ann\u00e9es 1980 constitue une p\u00e9riode charni\u00e8re particuli\u00e8rement visible dans les s\u00e9ries fran\u00e7aises<\/strong>.<\/p>\n

Avant cette p\u00e9riode, les anomalies mensuelles n\u00e9gatives restent tr\u00e8s nombreuses et les mois particuli\u00e8rement froids reviennent r\u00e9guli\u00e8rement. Puis la situation se modifie rapidement : les anomalies chaudes deviennent progressivement majoritaires et leur intensit\u00e9 augmente.<\/p>\n

La moyenne mobile des temp\u00e9ratures fran\u00e7aises commence alors \u00e0 monter de mani\u00e8re particuli\u00e8rement nette.<\/p>\n

La courbe de l’indicateur thermique annuel raconte exactement la m\u00eame histoire : apr\u00e8s plusieurs d\u00e9cennies de fluctuations autour de niveaux relativement stables, une hausse durable s’amorce \u00e0 partir de la fin des ann\u00e9es 1980 et devient de plus en plus spectaculaire au fil des d\u00e9cennies suivantes<\/strong>.<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

\"\"<\/p>\n

L’indicateur thermique national fran\u00e7ais montre une \u00e9l\u00e9vation particuli\u00e8rement nette des temp\u00e9ratures moyennes \u00e0 partir de la fin des ann\u00e9es 1980, tendance qui s’acc\u00e9l\u00e8re au cours des d\u00e9cennies suivantes.<\/em><\/p>\n

C’est ce qui rend l’ann\u00e9e 1987 si fascinante.<\/p>\n

Elle commence encore dans un climat capable de produire -13\u00b0C \u00e0 Paris, de la neige g\u00e9n\u00e9ralis\u00e9e et m\u00eame quelques flocons au d\u00e9but du mois de mai<\/strong>. Son mois de juillet reste souvent frais. Puis, quelques semaines plus tard, la France conna\u00eet jusqu’\u00e0 38\u00b0C en plein mois de septembre<\/strong>.<\/p>\n

Une ann\u00e9e m\u00e9t\u00e9orologique qui semble presque raconter, \u00e0 elle seule, le passage entre deux \u00e9poques.<\/p>\n

Depuis, les vagues de chaleur ont gagn\u00e9 en fr\u00e9quence et en intensit\u00e9, les \u00e9pisodes tr\u00e8s chauds se prolongent davantage en dehors du c\u0153ur de l’\u00e9t\u00e9 et les anomalies chaudes ont tr\u00e8s largement pris le dessus sur les anomalies froides.<\/p>\n

La vague de chaleur de septembre 1987 n’a donc pas provoqu\u00e9 cette bascule. Mais avec le recul, elle appara\u00eet comme un remarquable marqueur temporel : l’un de ces \u00e9pisodes survenus exactement au moment o\u00f9 le climat fran\u00e7ais \u00e9tait en train de changer de visage.<\/strong><\/p>\n

\u00a0<\/p>\n

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

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

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