September weather forecast
Sainte-Marie, Martinique

Come September, Sainte-Marie, Martinique begins to shed its peak summer characteristics with a noticeable change in weather parameters. An interesting aspect of September weather is an all-year high of 81mm (3.19") rainfall spread over 21.1 days. While temperatures remain generally high, the amount of daily sunlight starts to decline. This mild decline in sunshine hours foretells the approaching transition from summer to autumn. Preserve the bathing suits as sea temperatures remain high, perpetuating the perfect beach weather.

Temperature

September proves to be the warmest month in Sainte-Marie, recording an average peak temperature of 29.4°C (84.9°F) and a minimum temperature of 27.3°C (81.1°F).

Heat index

Throughout September, the heat index is estimated at a fiery hot 35°C (95°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', is an estimation of the warmth sensation when considering humidity levels. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity in Sainte-Marie is 75%.

Rainfall

In Sainte-Marie, Martinique, in September, it is raining for 21.1 days, with typically 81mm (3.19") of accumulated precipitation. Throughout the year, there are 251.6 rainfall days, and 667mm (26.26") of precipitation is accumulated.

Sea temperature

September is the month with the warmest seawater in Sainte-Marie, with an average sea temperature of 29.4°C (84.9°F).
Note: Swimming, diving, and other water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are highly enjoyable and provide prolonged comfort without unease.

Daylight

In Sainte-Marie, the average length of the day in September is 12h and 13min.
On the first day of the month, sunrise is at 05:51 and sunset at 18:15. On the last day of September, sunrise is at 05:53 and sunset at 17:53 AST.

Sunshine

In September, the average sunshine in Sainte-Marie is 10.1h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Sainte-Marie. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The UV index of 7 in September translates into these instructions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.