Jolly Harbour
Antigua and Barbuda
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Jolly Harbour, Antigua and Barbuda

September, the first month of the autumn, in Jolly Harbour, is still a tropical month, with average temperature fluctuating between 31°C (87.8°F) and 25°C (77°F).

Temperature

July through September, with an average high-temperature of 31°C (87.8°F), are the warmest months.

Rainfall

September is the month with the most rainfall. Rain falls for 17 days and accumulates 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 in Jolly Harbour.
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

The average length of the day in Jolly Harbour, Antigua and Barbuda, is 12.2h.

Sunshine

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

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an excessive health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 12 in September interpret into the following advice:
Practice all essential precautions. Protection against sun damage is crucial. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What are the warmest months in Jolly Harbour?

July through September, with an average high-temperature of 31°C (87.8°F), are warmest months in Jolly Harbour.

What is the temperature in September in Jolly Harbour?

The average high-temperature, in September, is 31°C (87.8°F), while the average low-temperature is 25°C (77°F).

How much does it rain in Jolly Harbour in September?

In September, in Jolly Harbour, the rain falls for 17 days. Throughout September, 140mm (5.51") of precipitation is accumulated.

What is the rainiest month in Jolly Harbour?

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

What is the month with the warmest sea water in Jolly Harbour?

September is the month with the warmest seawater in Jolly Harbour, Antigua and Barbuda, with an average sea temperature of 29°C (84.2°F).

What is the sea water temperature in September in Jolly Harbour?

In September, the average sea temperature in Jolly Harbour, Antigua and Barbuda, is 29°C (84.2°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.

What is the average length of the day in September in Jolly Harbour?

The average length of the day in September in Jolly Harbour is 12.2h.

What is the month with the least sunshine in Jolly Harbour?

Months with the least sunshine in Jolly Harbour, Antigua and Barbuda, are September through December, with an average of 7h of sunshine.

How long on average sun shines in September in Jolly Harbour?

In Jolly Harbour, Antigua and Barbuda, the average sunshine in September is 7h.

When is the highest UV index in Jolly Harbour?

Months with the highest UV index in Jolly Harbour, Antigua and Barbuda, are March through September, with an average maximum UV index of 12.

What is the UV index reading in September in Jolly Harbour?

In September, the average daily maximum UV index in Jolly Harbour is 12. A UV Index estimate of 11, and higher, represents an extreme health vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Jolly Harbour, Antigua and Barbuda
  • Average high temperature in September: 31°C

The warmest months (with the highest average high temperature) are July, August and September (31°C).
Months with the lowest average high temperature are January and February (28°C).

  • Average low temperature in September: 25°C

Months with the highest average low temperature are June, July, August and September (25°C).
The coldest months (with the lowest average low temperature) are January, February and March (22°C).

Average rainfall in September - Jolly Harbour, Antigua and Barbuda
  • Average rainfall in September: 140mm

The wettest month (with the highest rainfall) is September (140mm).
The driest month (with the least rainfall) is February (37mm).

Average rainfall days in September - Jolly Harbour, Antigua and Barbuda
  • Average rainfall days in September: 17 days

Months with the highest number of rainy days are September, October, November and December (17 days).
The month with the least rainy days is April (11 days).

Average sea temperature in September - Jolly Harbour, Antigua and Barbuda
  • Average sea temperature in September: 29°C

The best month for swimming (with the highest average sea temperature) is September (29°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (26°C).

Average daylight in September / Average sunshine in September - Jolly Harbour, Antigua and Barbuda
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.1h).
The month with the shortest days is December (Average daylight: 11.1h).

  • Average sunshine in September: 7h

Months with the most sunshine are January, February, March, April, May, June, July and August (Average sunshine: 8h).
Months with the least sunshine are September, October, November and December (Average sunshine: 7).

Average UV index in September - Jolly Harbour, Antigua and Barbuda
  • Average UV index in September: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January and December (UV index 8).