The climate of Comoros essentially consists of two seasons. The humid hot season starts from the month of November and continues until April. The cool season dominates the archipelago the rest of the year. Monthly temperatures along the coasts range from 23°Centigrade to 28°Centigrade. The climate in Comoros is characterized by heavy rainfall. Cyclones occur with regular intensity during the humid and hot season. They cause much economic damage to the poor island country.
The islands forming the Comoros nation are formed by volcanic activity. This has resulted in a scarcity of natural water sources within the islands. Rainfall though heavy, is not harvested in a planned way. This results in fresh water shortage in the islands. The Comoros islands of Njazidja and Nzwani suffer the most. The islands of Mayotte and Mwali possess natural streams, which meet the freshwater requirements of the island population. The higher mountainous central regions of the islands are cooler and receive comparatively heavier rainfall when compared to the coastal areas. This climatic variation promotes the diversity of flora and fauna within the islands.