September weather forecast
Reunion

September in Reunion represents the beginning of the transition from the cool, dry winter to the warmer, wetter summer. Coastal areas experience temperatures between 20°C (68°F) to 25°C (77°F), marking a slight increase from the preceding winter months. In the highlands, temperatures range from 13°C (55.4°F) to 18°C (64.4°F).

Cities like Saint-Denis and Saint-Pierre experience a similar trend, with a gradual rise in temperature. Additionally, humidity levels begin to increase in September, signaling the impending return of the humid summer conditions.

September also sees a moderate increase in rainfall. The eastern coast and the mountainous regions record precipitation levels between 80mm (3.15") to 130mm (5.12"). The western coast, which is traditionally drier, continues to receive less rainfall due to the island's topographical influence.

Comparing September to August, there's a slight increase in both temperatures and rainfall, indicating the beginning of the transition to summer. As the island progresses into October, these trends continue, with further increases in both temperature and rainfall.

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• Saint-Denis - September »
  The months with the coldest seawater in Saint-Denis are August and September, with an average sea temperature of 23.8°C (74.8°F). In Saint-Denis in September, during 8.1 rainfall days, 50mm (1.97") of precipitation is typically accumulated.
• Saint-Paul - September »
  The month with the least rainfall in Saint-Paul is September, when the rain falls for 14.9 days and typically collects 15mm (0.59") of precipitation. The month with the coldest seawater in Saint-Paul, Reunion, is September, with an average sea temperature of 23.7°C (74.7°F).
• Saint-Pierre - September »
  With an average sea temperature of 23.7°C (74.7°F), September is the month with the coldest seawater in Saint-Pierre. The months with the lowest humidity in Saint-Pierre are July through September, with an average relative humidity of 77%.
• Saint-Louis - September »
  The month with the least rainfall in Saint-Louis is September, when the rain falls for 9.5 days and typically collects 10mm (0.39") of precipitation. The months with the lowest humidity in Saint-Louis are July through September, with an average relative humidity of 77%.
• Le Port - September »
  The months with the coldest seawater in Le Port are August and September, with an average sea temperature of 23.8°C (74.8°F). On the first day of September in Le Port sunrise is at 06:27 and sunset at 18:09.
• Saint-Joseph - September »
  With an average sea temperature of 23.6°C (74.5°F), September is the month with the coldest seawater in Saint-Joseph. September in Saint-Joseph brings the first signs of spring as the sea temperature climbs back to 23.6°C (74.5°F).
• Saint-Leu - September »
  September is the month with the coldest seawater in Saint-Leu with an average sea temperature of 23.7°C (74.7°F). September is the month with the coldest seawater in Saint-Leu with an average sea temperature of 23.7°C (74.7°F).
• Les Avirons - September »
  The month with the coldest seawater in Les Avirons is September, with an average sea temperature of 23.7°C (74.7°F). Les Avirons, Reunion, greets September with a marginal descent in sea temperature from 23.8°C (74.8°F) in August to 23.7°C (74.7°F).