September weather forecast and climate
Grand Anse Beach, Saint Lucia

The first month of the autumn, September, is also a hot month in Grand Anse Beach, Saint Lucia, with average temperature ranging between max. 30°C (86°F) and min. 24°C (75.2°F).

Temperature

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

Rainfall

In Grand Anse Beach, in September, 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

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

In Grand Anse Beach, the average length of the day 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

Months with the highest UV index are March through September, with an average UV index of 12.

What are the warmest months in Grand Anse Beach?

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

What is the temperature in September in Grand Anse Beach?

In Grand Anse Beach, 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 Grand Anse Beach?

In Grand Anse Beach, Saint Lucia, during September, the rain falls for 25 days and regularly aggregates up to 224mm (8.8") of precipitation.

What months are the sea warmest in Grand Anse Beach?

September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Grand Anse Beach, Saint Lucia. For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the sea water temperature in September in Grand Anse Beach?

In Grand Anse Beach, Saint Lucia, in September, the average water temperature is 29°C (84.2°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Grand Anse Beach?

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

What are the months with the most sunshine in Grand Anse Beach?

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

How long on average sun shines in September in Grand Anse Beach?

The average sunshine in September in Grand Anse Beach, Saint Lucia, is 8h.

What is the month with the highest UV index in Grand Anse Beach?

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

How high is the UV index in September in Grand Anse Beach?

The average UV index in September in Grand Anse Beach, Saint Lucia, is 12.
Average temperature in September - Grand Anse Beach, 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 - Grand Anse Beach, 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 - Grand Anse Beach, 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 - Grand Anse Beach, 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 - Grand Anse Beach, 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 - Grand Anse Beach, 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).

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