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Climate - Comoros


Average weather, temperature, rainfall, sunshine

Flag - Comoros

Map - Comoros

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The climate of the Comoro Islands, an archipelago in the Indian Ocean south of the Equator, 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 warmest period is from January to April, with an average daily temperature around 28 °C (82 °F), while the coolest months are July, August and September, when the average drops to around 25 °C (77 °F).
Here are the average temperatures in the capital, Moroni, located on the west coast of the island of Grande Comore.
Moroni - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January243127.8768882
February243127.9768982.2
March243228.1768982.5
April243227.9758982.2
May233127.1738880.7
June223025.8718678.5
July212925698577
August202924.8698576.6
September213025.4708577.6
October233126.6738779.9
November243228759082.4
December243228.1769082.6
Year22.930.926.873.287.580

Of the three main islands that make up the archipelago, the two smaller ones (Mohéli and Anjouan) are occupied by hills in the interior, while the largest one, Grande Comore or Ngazidja, is home to a real mountain, Karthala volcano, 2,360 meters (7,743 feet) high. The slopes enhance cloud formation, which can lead to showers and thunderstorms, especially on the main island, which, in fact, is the rainiest. On Mount Karthala, up to 5,000 millimeters (195 inches) of rain fall per year, while Moroni, which is located on the windward side in the rainy season (that is, it is exposed to the north-west monsoon), receives 2,700 mm (106 in) of rain per year.
Here is the average precipitation in Moroni.
Moroni - Average precipitation
MonthMillimetersInchesDays
January36514.418
February29511.616
March2801118
April31512.418
May2551012
June26510.412
July2459.612
August1505.910
September1104.311
October953.712
November1104.312
December2208.716
Year2705106.5167

In Fomboni, on the island of Mohéli, total annual rainfall is 2,100 mm (83 in), while Ouani, on the island of Anjouan (also known as Nzwani), receives 1,800 mm (70 in) of rain per year. January is the rainiest month throughout the archipelago, with more than 300 mm (12 in) of rain along the coasts, while the driest month in Moroni is October, with 95 mm (3.7 in) of rain, which shows that showers and thunderstorms can occur quite frequently even in the dry season, at least on the main island. However, these rains, though intense, are short-lived, and they usually soon make room for the sun. On the smaller islands, during the dry season, showers are less frequent and less intense.
Here is the average precipitation in Fomboni.
Fomboni - Average precipitation
MonthMillimetersInchesDays
January3301317
February2801115
March2459.616
April2409.413
May1807.112
June1455.710
July1556.110
August1054.17
September602.44
October903.56
November953.77
December1957.713
Year211583.3130

Despite the rains, the Comoros suffer from a shortage of fresh water due to the absence of rivers.

Comoros

The amount of sunshine in the Comoros is not exceptional, nor scarce. The sun shines for a few hours a day even in the wettest months. The sunniest period is that of the trade winds, ie May-November, when, however, a bit of cloudiness can form, especially near the mountains. Here are the average sunshine hours per day in Moroni.
Moroni - Sunshine hours
MonthAverageTotal
January6185
February6.5175
March7.5225
April6.5190
May7.5230
June7.5230
July7.5235
August7.5230
September7.5220
October7.5235
November7.5230
December7210
Year7.22610

The sea in the Comoros is warm enough for swimming all year round: the water temperature ranges from 25 °C (77 °F) in August to 29 °C (84 °F) in the period from February to April.
Moroni - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2984
February2984
March2984
April2984
May2882
June2781
July2679
August2577
September2679
October2679
November2781
December2882
Year27.481.4

Tropical cyclones



The Comoros are located in the path of tropical cyclones, which can affect the islands from November to mid-May, though they are more likely from late December to mid-April.

When to go and what to pack in Comoros

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