September weather forecast
British Indian Ocean Territory

September in the British Indian Ocean Territory marks the onset of the transition period from the dry season back to the wet season. Rainfall begins to increase during this month, with an average precipitation of 100mm (3.94"), a noticeable rise compared to August, yet significantly lower than peak monsoon months.

Average temperatures in September maintain a range similar to preceding months, varying from 25°C (77°F) to 27°C (80.6°F). The relative humidity, persistently high, typically exceeds 80%, contributing to a warmer perceived temperature.

In comparison to August, September sees an increase in rainfall, signifying the beginning of the shift to the wet season. As the territory progresses into October, the rainfall is expected to rise further, while temperatures and humidity remain fairly consistent.

As with the other months, the largest settlement, the U.S. naval support facility on Diego Garcia, experiences weather conditions similar to the rest of the territory. The British Indian Ocean Territory, being predominantly uninhabited, does not have any notable cities.

Despite the increased rainfall, September can still be an attractive time for visitors. The transition period can present unique opportunities for wildlife observations. Moreover, the temperatures remain pleasant, and the underwater visibility is still good, offering continued opportunities for divers and snorkelers.

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• Diego Garcia - September »
  In Diego Garcia during September, the rain falls for 15 days and regularly aggregates up to 260mm (10.24") of precipitation. On the first day of September in Diego Garcia, British Indian Ocean Territory, sunrise is at 07:10 and sunset at 19:09.