Diego Garcia
British Indian Ocean Territory
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Diego Garcia, British Indian Ocean Territory

Palm trees bent towards the ocean in a lagoon beach in Diego Garcia, within the British Indian Ocean Territory
Palm trees bent towards the ocean in a lagoon beach in Diego Garcia, within the British Indian Ocean Territory
The first month of the spring, September, is also a hot month in Diego Garcia, British Indian Ocean Territory, with average temperature fluctuating between 27°C (80.6°F) and 30°C (86°F).

Temperature

The coldest months are March through November, with an average high-temperature of 30°C (86°F).

Rainfall

In September, the rain falls for 15 days. Throughout September, 260mm (10.2") of precipitation is accumulated. In Diego Garcia, during the entire year, the rain falls for 123 days and collects up to 2213mm (87.1") of precipitation.

Sea temperature

June through September, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater in Diego Garcia.
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day is 12.1h.

Sunshine

June and September, with an average of 6.7h of sunshine, are months with the least sunshine in Diego Garcia.

UV index

January through April, August through December, with an average maximum UV index of 12, are months with the highest UV index in Diego Garcia. A UV Index of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 12 translate into the following recommendations:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What are the coldest months in Diego Garcia?

March through November, with an average high-temperature of 30°C (86°F), are the coldest months in Diego Garcia.

What is the temperature in September in Diego Garcia?

In Diego Garcia, in September, the average high-temperature is 30°C (86°F), and the average low-temperature is 27°C (80.6°F).

How much does it rain in Diego Garcia in September?

In Diego Garcia, during September, the rain falls for 15 days and regularly aggregates up to 260mm (10.2") of precipitation.

When is the sea coldest in Diego Garcia?

June through September, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater in Diego Garcia, British Indian Ocean Territory.

How warm is the water in September in Diego Garcia?

In Diego Garcia, in September, the average water temperature is 27°C (80.6°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Diego Garcia have in September?

The average length of the day in September in Diego Garcia is 12.1h.

What is the month with the least sunshine in Diego Garcia?

June and September, with an average of 6.7h of sunshine, are months with the least sunshine in Diego Garcia, British Indian Ocean Territory.

How long on average sun shines in September in Diego Garcia?

In September, the average sunshine is 6.7h.

When is the highest UV index in Diego Garcia?

Months with the highest UV index in Diego Garcia, British Indian Ocean Territory, are January through April, August through December, with an average maximum UV index of 12.

What is the UV index intensity in September in Diego Garcia?

The average daily maximum UV index in September in Diego Garcia is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in September - Diego Garcia, British Indian Ocean Territory
  • Average high temperature in September: 30°C

Warmest months (with the highest average high temperature) are January, February and December (31°C).
Months with the lowest average high temperature are March, April, May, June, July, August, September, October and November (30°C).

  • Average low temperature in September: 27°C

Months with the highest average low temperature are January, March, April, May, August, September, October and December (27°C).
Coldest months (with the lowest average low temperature) are February, June, July and November (26°C).

Average rainfall in September - Diego Garcia, British Indian Ocean Territory
  • Average rainfall in September: 260mm

The wettest month (with the highest rainfall) is August (298mm).
The driest month (with the lowest rainfall) is February (18mm).

Average rainfall days in September - Diego Garcia, British Indian Ocean Territory
  • Average rainfall days in September: 15 days

The month with the highest number of rainy days is June (17 days).
Months with the lowest number of rainy days are February and March (1 days).

Average sea temperature in September - Diego Garcia, British Indian Ocean Territory
  • Average sea temperature in September: 27°C

Best months for swimming (with the highest average sea temperature) are March and April (29°C).
Coldest months (with the lowest average sea temperature) are June, July, August and September (27°C).

Average daylight in September / Average sunshine in September - Diego Garcia, British Indian Ocean Territory
  • Average daylight in September: 12.1h

Months with the longest days are January, November and December (Average daylight: 12.5h).
Months with shortest days are June and July (Average daylight: 11.7h).

  • Average sunshine in September: 6.7h

The month with most sunshine is February (Average sunshine: 9.3h).
Months with least sunshine are June and September (Average sunshine: 6.7).

Average UV index in September - Diego Garcia, British Indian Ocean Territory
  • Average UV index in September: 12

Months with the highest UV index are January, February, March, April, August, September, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 10).