September weather forecast
Marigot Bay, Saint Lucia

September marks a decline in both the temperature and intensity of rainfall compared to August. Notable is the dramatic decrease in rainfall from the previous month's high 82mm (3.23") to a more moderate 63mm (2.48") over 20.3 days. September's weather suggests the start of the transition from the wet to the dry season. The liveliness of Marigot Bay continues, with nature blooming under the showers and warmth. In essence, September heralds the beginning of the close of the wet season, making way for drier months in the future.

Temperature

In Marigot Bay, September is the warmest month, with temperatures averaging a high of 30.3°C (86.5°F) and a low of 27°C (80.6°F).

Heat index

In September, the heat index is calculated to be a torrid 37°C (98.6°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

January through March and September, with an average relative humidity of 73%, are the least humid months.

Rainfall

In September, in Marigot Bay, the rain falls for 20.3 days. Throughout September, 63mm (2.48") of precipitation is accumulated. Throughout the year, there are 255.2 rainfall days, and 560mm (22.05") 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 in Marigot Bay.
Note: With water temperature from 25°C (77°F) to 29°C (84.2°F), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

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

Sunshine

In September, the average sunshine in Marigot Bay is 9.6h.

UV index

January through May, July through December, with an average maximum UV index of 7, are months with the highest UV index in Marigot Bay, Saint Lucia. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, a regular UV index of 7 translates into these guidelines:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.