September weather forecast
Fort-de-France Bay, Martinique

September ushers in a gentle decline in the Fort-de-France Bay's climatic extremities. The weather progressively moves away from the high rainfall mark, with a mild decrease to 235mm (9.25"). This transition from peak humidity to drier conditions sets September apart. Despite less rainfall, the days continue to be bright, sunny, and considerably long. As the city starts its gradual shift towards the cooler months of autumn, beach lovers can still enjoy balmy sea temperatures before the seasonal change.

Temperature

September is the warmest month of the year, registering average temperatures as high as 30.3°C (86.5°F) and as low as 24°C (75.2°F).

Rainfall

In September, the rain falls for 17.9 days. Throughout September, 235mm (9.25") of precipitation is accumulated. In Fort-de-France Bay, during the entire year, the rain falls for 198.2 days and collects up to 2021mm (79.57") of precipitation.

Sea temperature

September and October, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Fort-de-France Bay.
Note: Between 25°C (77°F) and 29°C (84.2°F), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

In Fort-de-France Bay, the average length of the day in September is 12h and 13min.
On the first day of September in Fort-de-France Bay, 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

In September, the average sunshine is 6.9h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for the average person.
Note: A maximum daily UV index of 12 during September morphs into the following directions:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight 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. Regardless of cloud cover, it's recommended to apply generously and reapply often a sunscreen with an SPF of at least 30, especially after swimming or any outdoor activity. Take note! The UV strength of the Sun elevates when reflected off water and sand.