Gros Islet
Saint Lucia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Gros Islet, Saint Lucia

September, the first month of the autumn, in Gros Islet, is still a hot month, with average temperature ranging between min 24°C (75.2°F) and max 30°C (86°F).

Temperature

May through October, with an average high-temperature of 30°C (86°F), are the warmest months.

Rainfall

In Gros Islet, Saint Lucia, during 25 rainfall days, 224mm (8.8") of precipitation is typically accumulated. Throughout the year, there are 209 rainfall days, and 2035mm (80.1") of precipitation is accumulated.

Sea temperature

With an average sea temperature of 29.4°C (84.9°F), September is the month with the warmest seawater.
Note: 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.

Daylight

The average length of the day in Gros Islet is 12.2h.

Sunshine

January through September, November and December, with an average of 8h of sunshine, are months with the most sunshine.

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 ultimate health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 12 transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 warmest months in Gros Islet?

Warmest months in Gros Islet, Saint Lucia, are May through October, with an average high-temperature of 30°C (86°F).

What is the temperature in September in Gros Islet?

In Gros Islet, in September, the average high-temperature is 30°C (86°F), and the average low-temperature is 24°C (75.2°F).

How many days does it rain in September in Gros Islet?

In Gros Islet, Saint Lucia, in September, during 25 rainfall days, 224mm (8.8") of precipitation is typically accumulated.

When is the sea warmest in Gros Islet?

With an average sea temperature of 29.4°C (84.9°F), September is the month with the warmest seawater in Gros Islet.

How warm is the water in September in Gros Islet?

In Gros Islet, Saint Lucia, in September, the average water temperature is 29.4°C (84.9°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 Gros Islet?

The average length of the day in September in Gros Islet is 12.2h.

What are the months with the most sunshine in Gros Islet?

Months with the most sunshine in Gros Islet, Saint Lucia, are January through September, November and December, with an average of 8h of sunshine.

How many hours of sunshine does Gros Islet have in September?

In Gros Islet, Saint Lucia, the average sunshine in September is 8h.

What is the month with the highest UV index in Gros Islet?

March through September, with an average maximum UV index of 12, are months with the highest UV index in Gros Islet.

What is the UV index intensity in September in Gros Islet?

In September, the average daily maximum UV index in Gros Islet, Saint Lucia, is 12. A UV Index of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Gros Islet, Saint Lucia
  • Average high temperature in September: 30°C

Warmest months (with the highest average high temperature) are May, June, July, August, September and October (30°C).
Months with the lowest average high temperature are January and February (28°C).

  • Average low temperature in September: 24°C

The month with the highest average low temperature is July (25°C).
Coldest months (with the lowest average low temperature) are January, February and March (22°C).

Average rainfall in September - Gros Islet, Saint Lucia
  • Average rainfall in September: 224mm

The wettest month (with the highest rainfall) is October (269mm).
The driest month (with the lowest rainfall) is March (76mm).

Average rainfall days in September - Gros Islet, Saint Lucia
  • Average rainfall days in September: 25 days

The month with the highest number of rainy days is September (25 days).
The month with the lowest number of rainy days is April (11 days).

Average sea temperature in September - Gros Islet, Saint Lucia
  • Average sea temperature in September: 29.4°C

The best month for swimming (with the highest average sea temperature) is September (29.4°C).
The coldest month (with the lowest average sea temperature) is March (27°C).

Average daylight in September / Average sunshine in September - Gros Islet, Saint Lucia
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13h).
The month with shortest days is December (Average daylight: 11.3h).

  • Average sunshine in September: 8h

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

Average UV index in September - Gros Islet, Saint Lucia
  • Average UV index in September: 12

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