Cold front conditions will reach Reunion Island’s shores Thursday night, as a polar depression tracking across the southern Indian Ocean pushes a significant southern swell and sharp temperature drop toward the island, with disruption forecast to persist through the weekend.
Météo France has placed the western and southern coastlines under yellow alert for wave-submersion conditions beginning at 21h Thursday evening. The southern swell is expected to intensify Friday morning, with wave heights averaging 4 meters along the southern coast. Strong winds and heavy seas are forecast to persist through Saturday before wind direction shifts toward the southeast, concentrating impacts on the Saint-Pierre and Saint-Denis areas.
François Bonnardot, chief forecaster at Météo France Océan Indien, described the incoming system as a routine austral winter sequence. “This Friday we will lose several degrees,” Bonnardot said. “In the South Sauvage region at its daily maximum, temperatures should not exceed 20 or 21 degrees. It is a usual sequence, typical of the austral winter.” The drop marks a sharp reversal from the unusually warm conditions that have dominated the island’s recent weather.
Wind gusts between 55 and 65 kilometers per hour are expected along exposed coastlines and ridge areas during late night and early morning hours. The southern region will take the initial wind impacts, though western beaches, the Saint-Benoît and Saint-André areas, and elevated terrain will also face substantial activity. Heavy rainfall is forecast across much of the southern and southeastern portions of the island in the late night and into Friday morning, with the South Sauvage region expected to remain unsettled throughout the weekend.
For coastal and maritime services, the cold front’s passage represents a concrete operational challenge. Wave-submersion alerts require active monitoring of port operations, beach access, and coastal infrastructure. The combination of strong winds and heavy seas will create difficult conditions for maritime traffic through at least Saturday.
Meanwhile, Météo France’s forecast trajectory indicates the system will gradually weaken as it moves away from the island, though residual wind and swell activity will continue to affect operations. The weekend shift toward southeast winds will concentrate pressure on the eastern and northern zones, particularly around Saint-Denis and Saint-Pierre, where service operators face an extended period of strong wind activity before conditions ease.
Whether the system tracks as forecast, or lingers longer than the models currently suggest, will determine how much disruption coastal operations absorb before the new week begins.