The climate is tropical, with two seasons, the dry season lasting from May to October, with an average temperature of 75°F (24°C), and the rainy season from November to April, when both temperature and humidity are higher. The cyclone season is from December to March.
The territory of Mayotte is exposed to dynamic tropical phenomena (monsoon flows, tropical cyclones, etc), often accompanied by intense rains. In December 2024, tropical cyclone Chido hit the island with devastating consequences for the population and the territory. Less than a month later, in January 2025, Tropical Storm Dikeledi brought torrential rains to the south of the island. In the wet season, thunderstorms can also be intense (but more localized) and generate a lot of damage.
Mayotte is to install its first Météo-France radar. This system is projected to refine existing data from the satellite network and rain gauges and better anticipate extreme events. Construction of the forecasting tool will be completed by the summer of 2027, with major work and preliminary studies launched in 2025.
The installation of a radar in Mayotte is intended to improve the anticipation of extreme events, and therefore the prevention of risks associated with heavy rains, whether related to tropical cyclones or smaller-scale phenomena. It will be able to identify precipitation within a radius of 250km around the island, and quantify it up to 100km, with the resolution of a kilometer. It will also allow better management of the water resource.
The data from the radar will be directly used by Mayotte forecasters, and by the Météo-France teams located in Réunion, who are in charge of cyclonic monitoring for the entire southwest Indian Ocean basin, as well as by the National Forecasting Centre in Toulouse. In the longer term, forecasters will be able to deploy relevant warning services regarding heavy rains.
Mayotte was previously the only French department that was not covered by radar information.
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