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Diego Garcia's climate is
tropical, hot all year round. There is no dry season, so the climate can be defined equatorial, even though the rains are more abundant from September to March and less abundant from June to August.
The atoll, together with the Chagos Islands to which it belongs, forms the British Indian Ocean Territory, and is located south of the Maldives and at 7 degrees south latitude.
The southeast trade winds blow all year round, but especially from June to September.
Diego Garcia - Climate data
In Diego Garcia, the
average temperature of the coldest month (August) is of 27 °C (80.6 °F), that of the warmest month (April) is of 28.8 °C (83.9 °F). Here are the average temperatures.
Diego Garcia - Average temperatures (1991-2020) | Month | Min (°C) | Max (°C) | Mean (°C) | Min (°F) | Max (°F) | Mean (°F) |
|---|
| January | 25.2 | 30.9 | 28.1 | 77 | 88 | 82.5 |
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| February | 25.5 | 31.4 | 28.5 | 78 | 89 | 83.2 |
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| March | 25.8 | 31.8 | 28.8 | 78 | 89 | 83.8 |
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| April | 26 | 31.7 | 28.8 | 79 | 89 | 83.9 |
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| May | 25.7 | 31.1 | 28.4 | 78 | 88 | 83.1 |
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| June | 25.3 | 30.1 | 27.7 | 78 | 86 | 81.8 |
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| July | 24.7 | 29.4 | 27.1 | 77 | 85 | 80.8 |
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| August | 24.6 | 29.4 | 27 | 76 | 85 | 80.6 |
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| September | 24.7 | 29.7 | 27.2 | 76 | 85 | 81 |
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| October | 25 | 30.6 | 27.8 | 77 | 87 | 82 |
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| November | 25.3 | 31.1 | 28.2 | 77 | 88 | 82.8 |
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| December | 25.4 | 31.2 | 28.3 | 78 | 88 | 82.9 |
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| Year | 25.3 | 30.7 | 27.9 | 77.5 | 87.2 | 82.5 |
|---|
In Diego Garcia,
precipitation amounts to 2650 millimeters (104.3 inches) per year: it is therefore very abundant. It ranges from 145 mm (5.7 in) in the driest months (June, July, August) to 340 mm (13.4 in) in the wettest one (January). Here is the average precipitation.
Diego Garcia - Average precipitation| Month | Millimeters | Inches | Days |
|---|
| January | 340 | 13.4 | 22 |
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| February | 280 | 11 | 19 |
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| March | 215 | 8.5 | 18 |
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| April | 195 | 7.7 | 17 |
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| May | 165 | 6.5 | 15 |
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| June | 145 | 5.7 | 15 |
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| July | 145 | 5.7 | 17 |
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| August | 145 | 5.7 | 16 |
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| September | 245 | 9.6 | 16 |
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| October | 280 | 11 | 20 |
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| November | 220 | 8.7 | 19 |
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| December | 275 | 10.8 | 20 |
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| Year | 2650 | 104.3 | 212 |
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At Diego Garcia, the
sea temperature ranges from 27 °C (81 °F) in June, July, August, September to 29 °C (84 °F) in March, April. Here are the average sea temperatures.
Diego Garcia - Sea temperature| Month | Celsius (°C) | Fahrenheit (°F) |
|---|
January | 28 | 82 | February | 28 | 82 | March | 29 | 84 | April | 29 | 84 | May | 28 | 82 | June | 27 | 81 | July | 27 | 81 | August | 27 | 81 | September | 27 | 81 | October | 28 | 82 | November | 28 | 82 | December | 28 | 82 | Year | 27.9 | 82.1 |
Diego Garcia - Weather by month
Based on the period 1991-2020
In
January, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.1 °C (83 °F), with a minimum of 25.2 °C (77.4 °F) and a maximum of 30.9 °C (87.6 °F).
On the coldest nights of the month, the temperature usually drops to around 23 °C (73.5 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 340 mm (13.4 in), distributed over 22 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
February, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.5 °C (83 °F), with a minimum of 25.5 °C (77.9 °F) and a maximum of 31.4 °C (88.5 °F).
On the coldest nights of the month, the temperature usually drops to around 23.5 °C (74 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 280 mm (11 in), distributed over 19 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
March, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.8 °C (84 °F), with a minimum of 25.8 °C (78.5 °F) and a maximum of 31.8 °C (89.2 °F).
On the coldest nights, the temperature usually drops to around 23.5 °C (74 °F).
On the warmest days, the temperature usually reaches around 34.5 °C (94.5 °F).
Precipitation amounts to 215 mm (8.5 in), distributed over 18 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
April, the hottest month of the year, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.8 °C (84 °F), with a minimum of 26 °C (78.7 °F) and a maximum of 31.7 °C (89.1 °F).
On the coldest nights, the temperature usually drops to around 23.5 °C (74.5 °F).
On the warmest days, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 195 mm (7.7 in), distributed over 17 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
May, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.4 °C (83 °F), with a minimum of 25.7 °C (78.3 °F) and a maximum of 31.1 °C (88 °F).
On the coldest nights, the temperature usually drops to around 23.5 °C (74 °F).
On the warmest days, the temperature usually reaches around 33.5 °C (92 °F).
Precipitation amounts to 165 mm (6.5 in), distributed over 15 days.
The day lasts on average 11 hours and 50 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 14 kph (8 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
June, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 27.7 °C (82 °F), with a minimum of 25.3 °C (77.5 °F) and a maximum of 30.1 °C (86.1 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73.5 °F).
On the warmest days, the temperature usually reaches around 32 °C (89.5 °F).
Precipitation amounts to 145 mm (5.7 in), distributed over 15 days.
The day lasts on average 11 hours and 40 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 27 °C (80.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
July, the weather in Diego Garcia is usually warm to hot and muggy. The average temperature is of 27.1 °C (81 °F), with a minimum of 24.7 °C (76.5 °F) and a maximum of 29.4 °C (85 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (73 °F).
On the warmest days of the month, the temperature usually reaches around 31 °C (88 °F).
Precipitation amounts to 145 mm (5.7 in), distributed over 17 days.
The day lasts on average 11 hours and 40 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 27 °C (80.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
August, the least warm month of the year, the weather in Diego Garcia is usually warm to hot and muggy. The average temperature is of 27 °C (81 °F), with a minimum of 24.6 °C (76.3 °F) and a maximum of 29.4 °C (84.9 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days of the month, the temperature usually reaches around 31 °C (87.5 °F).
Precipitation amounts to 145 mm (5.7 in), distributed over 16 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 27 °C (80.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
September, the weather in Diego Garcia is usually warm to hot and muggy. The average temperature is of 27.2 °C (81 °F), with a minimum of 24.7 °C (76.5 °F) and a maximum of 29.7 °C (85.5 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days, the temperature usually reaches around 32 °C (89.5 °F).
Precipitation amounts to 245 mm (9.6 in), distributed over 16 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 27 °C (80.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
October, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 27.8 °C (82 °F), with a minimum of 25 °C (77.1 °F) and a maximum of 30.6 °C (87 °F).
On the coldest nights, the temperature usually drops to around 23 °C (73 °F).
On the warmest days, the temperature usually reaches around 33 °C (92 °F).
Precipitation amounts to 280 mm (11 in), distributed over 20 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
November, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.2 °C (83 °F), with a minimum of 25.3 °C (77.5 °F) and a maximum of 31.1 °C (88 °F).
On the coldest nights, the temperature usually drops to around 23.5 °C (74 °F).
On the warmest days, the temperature usually reaches around 34 °C (93 °F).
Precipitation amounts to 220 mm (8.7 in), distributed over 19 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.
In
December, the weather in Diego Garcia is usually very hot and muggy. The average temperature is of 28.3 °C (83 °F), with a minimum of 25.4 °C (77.6 °F) and a maximum of 31.2 °C (88.1 °F).
On the coldest nights of the month, the temperature usually drops to around 23.5 °C (74 °F).
On the warmest days of the month, the temperature usually reaches around 34 °C (93.5 °F).
Precipitation amounts to 275 mm (10.8 in), distributed over 20 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.