September weather forecast
Matadi, Democratic Republic of Congo

In September, there is a noticeable increase in rainfall from 3mm (0.12") to 13mm (0.51"). Although the dry season persists, the increase in rainfall hints at the approaching wet season. The average temperature, UV index, and daylight remain relatively unchanged from August. September weather therefore sees a gradual transition towards the latter part of the year.

Temperature

Matadi's September weather showcases an average high temperature of a still tropical 31.5°C (88.7°F), equivalent to that of August. Throughout September, Matadi's nights cool down to an average of 21.6°C (70.9°F).

Heat index

In September, the average heat index is computed to be a very hot 38°C (100.4°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The average relative humidity in September is 66%.

Rainfall

In Matadi, in September, it is raining for 9.5 days, with typically 13mm (0.51") of accumulated precipitation. Throughout the year, there are 212.4 rainfall days, and 988mm (38.9") of precipitation is accumulated.

Daylight

The average length of the day in September in Matadi is 12h and 5min.
On the first day of the month, sunrise is at 06:05 and sunset at 18:06. On the last day of September, sunrise is at 05:51 and sunset at 18:00 WAT.

Sunshine

The average sunshine in September is 8.4h.

UV index

January, March through May, August, September and November, with an average maximum UV index of 7, are months with the highest UV index in Matadi. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. 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. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.