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

Fort-de-France Bay, Martinique, registers the highest average temperatures during the month of September, with peaks of 30.3°C (86.5°F) and lows of 24°C (75.2°F).

Rainfall

In Fort-de-France Bay, in September, it is raining for 17.9 days, with typically 235mm (9.25") of accumulated precipitation. Throughout the year, there are 198.2 rainfall days, and 2021mm (79.57") 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: In water activities such as swimming and diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed highly pleasurable for extended periods without any unease.

Daylight

The average length of the day in September is 12h and 13min.
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

In Fort-de-France Bay, the average sunshine in September is 6.9h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: A daily maximum UV index of 12 in September translates into the following instructions:
Implement all necessary safeguards, unprotected skin might suffer burns rapidly. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise. Heed this! UV intensity is much stronger when reflected off sand and water.