diff --git a/src/lib/meteofrance-auth.ts b/src/lib/meteofrance-auth.ts
index 49d44d4..d520866 100644
--- a/src/lib/meteofrance-auth.ts
+++ b/src/lib/meteofrance-auth.ts
@@ -17,11 +17,13 @@ export async function fetchMF(path: string, init: RequestInit = {}): Promise<Res
   if (!key) {
     throw new Error('METEOFRANCE_API_KEY missing in env');
   }
+  // Le portail Météo France utilise le header `apikey:` pour les API Keys
+  // longue durée (différent du `Authorization: Bearer` des tokens OAuth2 courts).
   return fetch(`${BASE}${path}`, {
     ...init,
     headers: {
       ...init.headers,
-      Authorization: `Bearer ${key}`,
+      apikey: key,
       Accept: 'application/json',
     },
   });