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Climate - Comoros

Temperature, rainfall, prevailing weather conditions, when to go, what to pack

See also the US version (°F - inches - feet)

Flag - Comoros

The climate of the Comoros is tropical, with a hot and rainy season from December to April, when the north-west monsoon prevails, and a relatively cool and dry season from May to November, when the south-east trade winds blow. The average daily temperature goes from 27 °C in the warmest period (January to April), to 23 °C in the coolest months (July, August and September).
Here are the average temperatures of Moroni.
Moroni average temperatures
Moroni J F M A M J J A S O N D
Min (°C) 23 23 23 23 21 20 19 18 19 20 22 23
Max (°C) 30 30 31 30 30 28 28 28 28 29 30 31

Of the three main islands that make up the archipelago, the two smallest ones (Mohéli and Anjouan) are covered by a hillock in the middle, while the largest, Grande Comore or Ngazidja, is home to a real mountain, the volcano Karthala, 2,360 metres high. The slopes enhance the cloud formation, associated with showers and thunderstorms, especially on the main island, which in fact is rainiest. On Karthala, 5,000 millimetres of rain per year fall; in the capital Moroni, which is located on the windward side in the rainy season (that is, it's exposed to the north-west monsoon), 2,700 mm of rain per year fall.
Here is the average precipitation in Moroni.
Average precipitation Moroni
Moroni J F M A M J J A S O N D Year
Prec. (mm) 365 295 280 315 255 265 245 150 110 95 110 220 2705
Days 18 16 18 18 12 12 12 10 11 12 12 16 167

In Fomboni, in the island of Mohéli, the total annual rainfall is 2,100 mm. Ouani, in the Anjouan Island (also known as Nzwani), receives 1,800 mm of rain per year. January is the rainiest month throughout the archipelago, with more than 300 mm of rain along the coast, while the driest month is October, when in Moroni 95 mm of rain fall, which shows that there's no shortage of showers and thunderstorms even in the dry season, at least in the main island. However, these rains though intense are short, so that they soon make room for the return of the sun. In the smaller islands, during the dry season the showers are less frequent and less intense.
Here is the average precipitation in Fomboni.
Average precipitation Fomboni
Fomboni J F M A M J J A S O N D Year
Prec. (mm) 332 279 245 239 180 144 154 107 58 88 97 194 2117
Days 17 15 16 13 12 10 10 7 4 6 7 13 130

Despite the rains, due to the absence of rivers, the Comoros suffer from a shortage of fresh water.
The Comoros are located in the path of tropical cyclones, which can pass over the islands from November to mid-May, with a greater chance from late December to mid-April.


The sea in the Comoros is warm enough for swimming all year round: the temperature ranges from 25 °C in August, to 29 °C in the period from February to April.
Sea temperature Moroni
Moroni J F M A M J J A S O N D
Sea (°C) 29 29 29 29 28 27 26 25 26 26 27 28

When to go

The best time to visit the Comoros and enjoy their yet uncrowded beaches, runs from June to October: it's the least sultry, the driest and sunniest, although some showers must still be put into account, especially in the main island. In the latter, since the rains are still abundant in June and July, you can choose the period from August to October.

What to pack

In winter (June to August): light clothes, a sweatshirt for the evening, a light scarf for the breeze; for the reef, equipment for snorkeling, water shoes or rubber soled shoes. For women it is best to avoid shorts and miniskirts outside of tourist resorts. To climb Karthala, hiking boots, fleece, raincoat.

In summer (December to February): tropics-friendly, loose fitting clothing, light shirts and pants of natural fibres (cotton, linen) or synthetics that breathe, light sweatshirt for the evening, light raincoat or umbrella.

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