September weather forecast
Doum, Gabon

The first month of the autumn, September, is still a warm month in Doum, Gabon, with an average temperature ranging between min 20.7°C (69.3°F) and max 29.1°C (84.4°F).

Temperature

September reports an average high-temperature of a still moderately hot 29.1°C (84.4°F), slightly varied from August's 29.5°C (85.1°F). During the month of September, Doum experiences a steady low-temperature average of 20.7°C (69.3°F).

Heat index

In September, the heat index is calculated to be a very hot 37°C (98.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
The standards for the heat index are set for locations in shade and under light breezes. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', blends air temperature and moisture content to represent the felt temperature to humans. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

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

Rainfall

In Doum, during September, the rain falls for 26.1 days and regularly aggregates up to 146mm (5.75") of precipitation. Throughout the year, there are 313.6 rainfall days, and 1610mm (63.39") of precipitation is accumulated.

Daylight

In Doum, the average length of the day in September is 12h and 7min.
On the first day of the month, sunrise is at 06:09 and sunset at 18:17. On the last day of September, sunrise is at 06:00 and sunset at 18:07 WAT.

Sunshine

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 reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 5 in September translates into this advice:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.