Climate - Cocos Islands

Index

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• Introduction - West Island
• Sea temperature
• Cyclones
• When to go
• What to pack

Introduction

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The climate of the Cocos (or Keeling) Islands, a territory of Australia in the Indian Ocean located 12 degrees south of the Equator, is tropical, with a hotter period from January to April, during which the maximum temperature hovers around 30 °C (86 °F), and a relatively cool period from July to September, during which it drops to around 28 °C (82 °F).

Relative humidity is always high, but the heat is tempered by the southeast trade winds, which blow throughout the year, with greater intensity in the coolest period, from July to September, when the average speed is 27 kph (17 mph), and a minimum in the hottest period, from January to March, when it drops to 18 kph (11 mph). In the latter period, the wind can sometimes change direction during periods of bad weather, which are due to the formation of tropical depressions or cyclones (see below).

The main islands (Home Island and West Island, the only inhabited ones, in addition to South Island) are part of the semicircular structure of the same atoll, called South Keeling. About 30 km (18 mi) further north is another semi-circular atoll, North Keeling.

West Island

The temperature is very stable, and it practically never gets either cold or very hot. In the past, temperatures occasionally dropped below 20 °C (68 °F). In West Island, the coldest record is 18.3 (64.9 °F), set in August 1979, while from 1991 to 2020, the temperature only dropped to 20.4 °C (68.7 °F) in December 2018.
On warmer days, temperatures typically reach 31 °C (88 °F) from January to April, and 29 °C (84 °F) in August and September. The highest record is 32.8 °C (91 °F), set in February 2017 and in April 2015.
Here are the average temperatures of West Island.

West Island - Average temperatures (1991-2020)

Month	Min (°C)	Max (°C)	Mean (°C)	Min (°F)	Max (°F)	Mean (°F)
January	25.2	29.9	27.6	77	86	81.6
February	25.3	30	27.7	78	86	81.8
March	25.4	30.1	27.7	78	86	81.9
April	25.6	30	27.8	78	86	82
May	25.4	29.3	27.4	78	85	81.3
June	25	28.7	26.8	77	84	80.3
July	24.4	28.1	26.3	76	83	79.3
August	24.3	28	26.1	76	82	79
September	24.3	28.1	26.2	76	83	79.1
October	24.6	28.6	26.6	76	83	79.9
November	24.9	29.1	27	77	84	80.6
December	24.8	29.4	27.1	77	85	80.8
Year	24.9	29.1	26.95	76.9	84.4	80.5

Rainfall is abundant, around 2,000 millimeters (79 inches) per year. There is no dry season, even though the rains are more frequent and abundant from February to July, when they hover between 180 and 260 mm (7 and 10 in in) per month, and less from September to December, when they are lower than 100 mm (4 in) per month. The rainfall records, however, are high even in the months that are generally less rainy, which means that the rains do not follow the same pattern in all years. Here is the average precipitation.

West Island - Average precipitation

Month	Millimeters	Inches	Days
January	155	6.1	10
February	180	7.1	12
March	230	9.1	15
April	265	10.4	14
May	205	8.1	14
June	210	8.3	14
July	220	8.7	15
August	105	4.1	11
September	85	3.3	8
October	90	3.5	6
November	95	3.7	6
December	95	3.7	9
Year	1935	76.2	135

There is a fair amount of sunshine hours even in the wettest months, since the tropical rains mainly occur in the form of downpours or thundestorms, so they usually do not last long. However, the sun shines more often in the driest season.

Sea temperature

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The sea is warm enough to swim in all year round, as you can see in the following table.

West Island - Sea temperature

Month	Celsius (°C)	Fahrenheit (°F)
January	28	82
February	28	83
March	29	83
April	29	83
May	28	83
June	28	82
July	27	81
August	27	81
September	27	80
October	27	80
November	27	81
December	27	81
Year	27.6	81.8

Tropical cyclones

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The Cocos Islands can be affected by tropical cyclones of the southern Indian Ocean, whose season runs from November 1 to May 15, although they are more frequent from December to March. However, in this area of the Indian Ocean, some tropical depressions (though not intense) have also been formed in other periods, namely, in June-July and September-October.

When to go

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The best time to visit the Cocos Islands corresponds to the months of September and October, since they are, on average, the least rainy of the year. However, some showers should be taken into account also in this period.
August is typically an acceptable month as well, although it's a bit more rainy.

What to pack

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All year round, bring light clothes, a scarf for the breeze, a light sweatshirt for the evening, and a light raincoat or umbrella, especially in the rainiest season.

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