The climate of the Seychelles archipelago is strongly influenced by the ocean, especially through changes in monsoonal winds, ocean currents and sea surface temperature patterns, hence a tropical maritime climate. The temperature varies between 25°C and 26°C in July and August, and between 27°C and 28°C in March and April. Near sea-level, the maximum temperature is about 4°C higher than at higher altitude, reaching an average of 31°C at mid-day in April. The topography of the Seychelles strongly influences rainfall patterns. The rainfall varies according to the height above sea level, and ranges from 76.2 mm in July to 404.8 mm in January. The mean annual rainfall total for Mahe is 2,369.4 mm over the coastal areas but it is expected to exceed that amount over most of the hilly interiors.
- The warming in the Seychelles region, over the period 1972-1997, is estimated to be of the range of 0.25 °C.
- The number of very warm days and nights is increasing dramatically, while the number of very cool days and nights are decreasing.
- Maximum and minimum temperatures show a positive warming between +0.33 to +0.82°C respectively.
- Overall, the dry season has larger upward trend (3 times that of the rainy season) and it is now characterized by wetter-like conditions compared to the 1972-1990 period.
- Extreme precipitation and flooding is now of great concern.