September weather forecast
Castries City, Saint Lucia

September in Castries City carries the wet season forward, receiving substantial 259mm (10.2") of rainfall. Despite its reputation as a wet month, this period allows the city to exhibit a perfect blend of sun and rain. The bustling streets under the warm afternoon sun and chilling showers spice up the City's life. The temperature remains stable, making the weather quite bearable despite the heavy showers. Even with high levels of humidity, each day ends with a spectacular sunset, creating an idyllic atmosphere.

Temperature

During May through October, Castries City registers its highest temperatures, averaging a high of 30°C (86°F).

Rainfall

In September, in Castries City, the rain falls for 24 days. Throughout September, 259mm (10.2") of precipitation is accumulated. Throughout the year, in Castries City, there are 208 rainfall days, and 2377mm (93.58") 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.
Note: 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.

Daylight

In Castries City, the average length of the day in September is 12h and 12min.
On the first day of September, sunrise is at 05:52 and sunset at 18:15. On the last day of the month, sunrise is at 05:53 and sunset at 17:54 AST.

Sunshine

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

UV index

The months with the highest UV index in Castries City, Saint Lucia, are March through September, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV rays for the average person.
Note: A daily high UV index of 12 in September leads to these guidelines:
Ensure every key safety measure. People with light skin might sustain burns in fewer than 5 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Apply liberally and reapply a broad-spectrum sunscreen of SPF 30+ every two hours, and promptly after any outdoor workout or a swim. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.