Castries City
Saint Lucia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Castries City, Saint Lucia

A high scenic panorama of the beautiful city of Castries, Saint Lucia
A high scenic panorama of the beautiful city of Castries, Saint Lucia
The first month of the autumn, September, is also a hot month in Castries City, Saint Lucia, with temperature in the range of an average low of 24°C (75.2°F) and an average high of 30°C (86°F).

Temperature

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

Rainfall

In Castries City, during 24 rainfall days, 259mm (10.2") of precipitation is typically accumulated. In Castries City, Saint Lucia, during the entire year, the rain falls for 208 days and collects up to 2377mm (93.6") of precipitation.

Sea temperature

Months with the warmest seawater in Castries City are September and October, with an average sea temperature of 29°C (84.2°F). 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 Castries City is 12.2h.

Sunshine

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

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme health hazard from the exposure to the Sun's UV rays for the ordinary person.
The daily maximum UV index of 12 interpret into the following advice:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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 Castries City?

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

What is the temperature in September in Castries City?

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

How much does it rain in Castries City in September?

In Castries City, Saint Lucia, in September, during 24 rainfall days, 259mm (10.2") of precipitation is typically accumulated.

What months are the sea warmest in Castries City?

Months with the warmest seawater in Castries City are September and October, with an average sea temperature of 29°C (84.2°F). 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.

How warm is the water in September in Castries City?

In September, the average sea temperature in Castries City 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.

How many hours of daylight does Castries City have in September?

The average length of the day in September in Castries City, Saint Lucia, is 12.2h.

What is the month with the most sunshine in Castries City?

January through September, November and December, with an average of 8h of sunshine, are months with the most sunshine in Castries City, Saint Lucia.

How many hours of sunshine does Castries City have in September?

In September, the average sunshine is 8h.

What are the months with the highest UV index in Castries City?

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

How high is the UV index in September in Castries City?

In Castries City, the average daily maximum UV index in September is 12. A UV Index of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV rays.
Average temperature in September - Castries City, 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, February, March and December (28°C).

  • Average low temperature in September: 24°C

Months with the highest average low temperature are May, June, July, August and September (24°C).
Coldest months (with the lowest average low temperature) are January, February, March and December (22°C).

Average rainfall in September - Castries City, Saint Lucia
  • Average rainfall in September: 259mm

The wettest month (with the highest rainfall) is October (303mm).
The driest month (with the lowest rainfall) is March (99mm).

Average rainfall days in September - Castries City, Saint Lucia
  • Average rainfall days in September: 24 days

The month with the highest number of rainy days is September (24 days).
The month with the lowest number of rainy days is April (11 days).

Average sea temperature in September - Castries City, Saint Lucia
  • Average sea temperature in September: 29°C

Best months for swimming (with the highest average sea temperature) are September and October (29°C).
Coldest months (with the lowest average sea temperature) are February and March (26°C).

Average daylight in September / Average sunshine in September - Castries City, Saint Lucia
  • Average daylight in September: 12.2h

Months with the longest days are June and July (Average daylight: 12.9h).
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 - Castries City, 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).