Météo-France La Réunion issued a yellow wind alert at 7:07 a.m. on Monday, September 14, 2026, giving residents across the island a clear warning: conditions will deteriorate sharply from 4 p.m., with the alert set to lift around 8 p.m.
The morning has been clear and bright island-wide. That calm, however, is temporary. Slope clouds are building gradually, concentrating over the northern and northwestern regions, driven by a south-southeast wind of moderate to strong intensity. By afternoon, cloud cover will thicken noticeably around the Piton de la Fournaise area, and by evening a new cold front will push through, bringing substantial rainfall in its wake.
The wind gusts are the central concern. The south-southeast flow has established itself with considerable force, and this afternoon the most intense gusts are forecast to reach 70 to 80 kilometers per hour along both the eastern and western coasts, extending upward toward the summits and ridgelines. The eastern shore will bear the worst of it, though western coastal areas and elevated terrain will also feel the impact.
Temperatures will dip slightly through the day. Coastal areas can expect readings between 25 and 28 degrees Celsius, while the highest summits will drop to 15 to 16 degrees Celsius. Sea conditions are already rough. A southern swell is currently approaching Reunion, with average wave heights expected to oscillate between 1.5 and 2 meters by late afternoon, worsening overnight as waves amplify to between 2.5 and 3 meters.
The shift from morning sunshine to afternoon cloudiness follows a recognizable pattern as the cold front moves into the region. The morning still offers reasonable conditions for outdoor activity. What changes at 4 p.m. is the risk profile for anyone in exposed locations.
Residents in coastal areas, on elevated terrain, or operating vehicles should exercise particular caution during the peak wind window between 4 p.m. and 8 p.m. The combination of strong gusts and rough seas makes conditions hazardous for maritime activities and any outdoor work in exposed settings.
Whether the cold front’s rainfall proves heavier than forecast overnight, and how quickly seas settle after the system passes, will determine how much disruption carries into Tuesday.