Climate - Diego Garcia (United Kingdom)

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.

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.
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.
The sea temperature ranges from 27 °C (27 °F) in June, July, August, September to 29 °C (29 °F) in March, April. Here are the average sea temperatures.

Diego Garcia - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)

In January, 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 average humidity is 82%.
The average wind speed is 13 kph (8 kph).
The average sea temperature is of 28 °C (82.5 °F).

In February, 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 average humidity is 81%.
The average wind speed is 13 kph (8 kph).
The average sea temperature is of 28 °C (82.5 °F).

In March, 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 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 34.5 °C (94.5 °F).
Precipitation amounts to 215 mm (8.5 in), distributed over 18 days.
The average humidity is 80%.
The average wind speed is 11 kph (7 kph).
The average sea temperature is of 29 °C (84 °F).

In April, the warmest month of the year, 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 of the month, the temperature usually drops to around 23.5 °C (74.5 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F).
Precipitation amounts to 195 mm (7.7 in), distributed over 17 days.
The average humidity is 80%.
The average wind speed is 11 kph (7 kph).
The average sea temperature is of 29 °C (84 °F).

In May, 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 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 33.5 °C (92 °F).
Precipitation amounts to 165 mm (6.5 in), distributed over 15 days.
The average humidity is 81%.
The average wind speed is 14 kph (8 kph).
The average sea temperature is of 28 °C (82.5 °F).

In June, 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 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 32 °C (89.5 °F).
Precipitation amounts to 145 mm (5.7 in), distributed over 15 days.
The average humidity is 81%.
The average wind speed is 17 kph (11 kph).
The average sea temperature is of 27 °C (80.5 °F).

In July, 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 average humidity is 82%.
The average wind speed is 19 kph (12 kph).
The average sea temperature is of 27 °C (80.5 °F).

In August, the coldest month of the year, 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 average humidity is 80%.
The average wind speed is 20 kph (12 kph).
The average sea temperature is of 27 °C (80.5 °F).

In September, 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 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 32 °C (89.5 °F).
Precipitation amounts to 245 mm (9.6 in), distributed over 16 days.
The average humidity is 81%.
The average wind speed is 18 kph (11 kph).
The average sea temperature is of 27 °C (80.5 °F).

In October, 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 of the month, the temperature usually drops to around 23 °C (73 °F).
On the warmest days of the month, the temperature usually reaches around 33 °C (92 °F).
Precipitation amounts to 280 mm (11 in), distributed over 20 days.
The average humidity is 82%.
The average wind speed is 15 kph (9 kph).
The average sea temperature is of 28 °C (82.5 °F).

In November, 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 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 °F).
Precipitation amounts to 220 mm (8.7 in), distributed over 19 days.
The average humidity is 81%.
The average wind speed is 12 kph (8 kph).
The average sea temperature is of 28 °C (82.5 °F).

In December, 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 average humidity is 81%.
The average wind speed is 11 kph (7 kph).
The average sea temperature is of 28 °C (82.5 °F).