September weather forecast
Mevang, Gabon

September brings the return of the wet season to Mevang. Rainfall levels rise again hitting the mark at 146mm (5.75"). The persisting humidity along with increasing rainfall makes the weather feel warmer. As a result, the city spends most of the time under a cloud cover, reducing sunshine durations. Despite being a transitional month, September still manages to hold on to its warm tropical charm.

Temperature

The transition from August to September sees average high-temperatures adjusting to a still moderately hot 29.1°C (84.4°F), from a not significantly different 29.5°C (85.1°F). Mevang's temperature in September lowers to a consistent average of 20.7°C (69.3°F) during the nights.

Heat index

In September, the heat index is estimated at a torrid 37°C (98.6°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

In September, the average relative humidity in Mevang is 87%.

Rainfall

In Mevang, in September, during 26.1 rainfall days, 146mm (5.75") of precipitation is typically accumulated. In Mevang, during the entire year, the rain falls for 313.6 days and collects up to 1610mm (63.39") of precipitation.

Daylight

In Mevang, the average length of the day in September is 12h and 7min.
On the first day of September, sunrise is at 06:12 and sunset at 18:19. On the last day of the month, sunrise is at 06:02 and sunset at 18:08 WAT.

Sunshine

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

UV index

The months with the lowest UV index are September and October, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: An average UV index of 5 in September transforms into this advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.