Climate & Weather Guide in Comoros

Climate zones, seasonal temperatures, rainfall patterns, and best travel times

Comoros has a warm tropical maritime climate with a strong wet-dry seasonal pattern, shaped by its small volcanic islands and the Indian Ocean. The hottest and wettest period is roughly December to April, while May to November is cooler and drier under southeast trade winds. Current climate sources put the national annual mean temperature at about 23.7 C and average annual rainfall around 2,098 mm, with cooler July conditions and warmer January conditions. Rainfall varies sharply by island and elevation, with wetter windward highlands and comparatively drier coastal and leeward areas. Cyclones, flooding, and intense rain events are important risks for residents and expats.

Summer Average

25-30°C

Winter Average

19-25°C

Climate Types

Tropical monsoon and Tropical rainforest and Tropical savanna

Annual Rainfall

1000-2400 mm

Sunshine Hours

2,200-2,800 hrs/yr

Average Humidity

70-85%

Regional Climate Variations

Grande Comore Coastal Belt

Grande Comore is generally the driest of the main islands, but it still has a humid tropical feel and receives substantial seasonal rain. Coastal areas are warmer and more exposed to trade winds, while the volcanic interior can be cooler and wetter at higher elevation. For residents, the climate feels hot but usually not extreme, with a pronounced rainy season from December to April and a more comfortable drier period from May to November. The island’s volcanic slopes also create local microclimates, so conditions can change noticeably over short distances.

Summer:25-30°C

Winter:21-24°C

High rainfall

Warm, humid, and seasonally stormy, with a noticeable dry-season relief and cooler upland pockets.

Anjouan Windward Highlands

Anjouan is one of the wettest parts of the country because its steep volcanic terrain forces moist air upward, producing frequent orographic rainfall. The windward slopes and higher elevations are cooler, greener, and more humid than the coast, while the leeward side is somewhat less rainy. Expats and residents should expect lush vegetation, regular showers in the wet season, and a climate that remains tropical rather than hot and dry. The highlands can feel pleasantly cooler, especially in the evenings and during the dry season.

Summer:24-29°C

Winter:20-23°C

Very high rainfall

Lush, humid, and frequently rainy, with cooler mountain air and strong local variation by slope exposure.

Mohéli Island

Mohéli has a tropical climate similar to the rest of the archipelago, but it is often slightly warmer on average and still strongly shaped by seasonal rainfall. Rain is abundant overall, though not as extreme as on the wettest slopes of Anjouan, and the island’s smaller size means weather patterns are less varied than on larger or more mountainous islands. For people living there, the climate is generally warm, coastal, and humid, with a long dry season that offers the most comfortable conditions for outdoor life.

Summer:25-30°C

Winter:22-25°C

High rainfall

Warm island weather with steady humidity, a clear wet season, and a comparatively comfortable dry season.

Comoros is a small archipelago with limited climate diversity, so three zones capture its main residential differences well. The islands are warm and humid year-round, but rainfall is highest on exposed volcanic slopes and more moderate on drier coastal areas, making the dry season the most comfortable time for many residents and expats.

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