September weather forecast
Grand Anse Beach, Saint Lucia

As Saint Lucia progresses into autumn, September carries the year's highest number of rainy days at 25. Rainfall remains persistently high at 224mm (8.82") despite the entrance into the latter half of the year. Weather conditions continue to maintain the extended tropical summer feel, with temperatures staying around the 30 degrees mark. Similarly, daylight and UV index hold steady, further extending the summer vibe. What distinguishes September is the sea temperature, which peaks at an inviting 29°C (84.2°F), providing an ideal retreat from the heat of the day.

Temperature

The warmest period in Grand Anse Beach, Saint Lucia, is usually observed in May through October, with the average high-temperature peaking at 30°C (86°F).

Rainfall

In September, in Grand Anse Beach, the rain falls for 25 days. Throughout September, 224mm (8.82") of precipitation is accumulated. Throughout the year, in Grand Anse Beach, Saint Lucia, there are 209 rainfall days, and 2035mm (80.12") of precipitation is accumulated.

Sea temperature

The months with the warmest seawater are September and October, with an average sea temperature of 29°C (84.2°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

The average length of the day in September in Grand Anse Beach is 12h and 12min.
On the first day of September, sunrise is at 05:51 and sunset at 18:14. On the last day of the month, sunrise is at 05:52 and sunset at 17:53 AST.

Sunshine

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

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 12 translates into the following recommendations:
Employ all crucial safeguards, unprotected skin could burn rapidly. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended. Sunscreen of at least SPF 30 should be applied generously and reapplied often on overcast days, especially post swim or outdoor exercise. Be on guard! The reflective nature of sand and water boosts UV exposure.