September weather forecast
Jolly Harbour, Antigua and Barbuda

September continues the pattern of Antigua's typical tropical weather, slightly reducing the length of daylight. Despite the transition into the latter part of the year, the sea temperature remains high promoting beach activities. However, as the UV index remains at its peak, sun protection measures are indispensable. Following August’s increase, there is a further surge in rainfall, bringing September's rainfall figure up to 140mm (5.51"), marking it as the wettest month in Jolly Harbour.

Temperature

Jolly Harbour sees the highest average temperatures during the months of July through September, peaking at 31°C (87.8°F).

Rainfall

The month with the most rainfall in Jolly Harbour is September, when the rain falls for 17 days and typically aggregates up to 140mm (5.51") of precipitation.

Sea temperature

With an average sea temperature of 29°C (84.2°F), September is the month with the warmest seawater.
Note: For swimming, diving, and enjoying other water activities, the range of 25°C (77°F) to 29°C (84.2°F) in water temperature is considered ideal, offering pleasure for extended periods without discomfort.

Daylight

In September, the average length of the day in Jolly Harbour is 12h and 14min.
On the first day of September, sunrise is at 05:53 and sunset at 18:20. On the last day of the month, sunrise is at 05:57 and sunset at 17:56 AST.

Sunshine

The months with the least sunshine are September through December, with an average of 7h of sunshine.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Jolly Harbour. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In September, a daily UV index of 12 turns into the following recommendations:
Ensure every crucial precaution is taken. Individuals with light skin could experience burns in under 5 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise. Attention! UV strength is notably upped by the reflection of sand and water.