September weather forecast
Cotonou, Benin

September’s weather in Cotonou denotes a subtle transition from the wet season to less wet conditions. Indicating the start of a new trend, September records 99mm (3.9") of rainfall and an inadequate daily sunshine duration of 5.5 hours. A marginal upswing in the average low temperature is noted, paired with an increase in sea temperature to 26°C (78.8°F). The daylight hours shrink to 12.2, while the UV index remains steady at 12 units, outlining consistent weather conditions compared to the previous month.

Temperature

The arrival of September in Cotonou brings an average high-temperature of a still warm 28.4°C (83.1°F), closely following the temperature pattern of August. Night temperatures in September exhibit a subtle decrease, settling at an average of 23.6°C (74.5°F).

Heat index

The heat index for September is computed to be a hot 33°C (91.4°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.

Humidity

In September, the average relative humidity in Cotonou is 82%.

Rainfall

In Cotonou, Benin, in September, during 8 rainfall days, 99mm (3.9") of precipitation is typically accumulated. In Cotonou, Benin, during the entire year, the rain falls for 75 days and collects up to 1308mm (51.5") of precipitation.

Sea temperature

In Cotonou, the average seawater temperature in September is 26°C (78.8°F).
Note: Water temperatures ranging between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, making swimming, diving, and similar water activities pleasurable for extended periods.

Daylight

In September, the average length of the day in Cotonou is 12h and 9min.
On the first day of the month, sunrise is at 06:43 and sunset at 18:57. On the last day of September, in Cotonou, Benin, sunrise is at 06:38 and sunset at 18:42 WAT.

Sunshine

In Cotonou, the average sunshine in September is 5.5h.

UV index

The months with the highest UV index in Cotonou are February through May, August through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 12 suggests this advice:
Put into action all important safeguards, unprotected skin may burn swiftly. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Use liberally and reapply a broad-spectrum SPF 30+ sunscreen every two hours, or straight away after any outdoor workout or swim. Take note! Sand and water reflections strengthen the Sun's UV exposure.