September weather forecast
Brazzaville, Congo

With the arrival of September, Brazzaville witnesses a slight incline in the rainfall, amounting to 41mm (1.61") over the course of the month. The atmospheric pressure rests at 1011.9mb. Meanwhile, the overall weather stays welcoming as the city encounters a drop in temperature. Furthermore, the weather remains constant over the course of this month with no significant spikes.

Temperature

September's beginning in Brazzaville signals an average high-temperature of a still tropical 32.5°C (90.5°F), barely different from August's 33.1°C (91.6°F). During the month of September, the temperature in Brazzaville generally drops to a low average of 22.9°C (73.2°F).

Heat index

The heat index in September is evaluated at a very hot 39°C (102.2°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
Consider that heat index readings are for situations in the shade and light wind. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In September, the average relative humidity is 62%.

Rainfall

In Brazzaville, in September, it is raining for 17.1 days, with typically 41mm (1.61") of accumulated precipitation. In Brazzaville, during the entire year, the rain falls for 243.1 days and collects up to 1109mm (43.66") of precipitation.

Daylight

The average length of the day in September is 12h and 5min.
On the first day of the month, sunrise is at 05:57 and sunset at 17:59. On the last day of September, sunrise is at 05:44 and sunset at 17:53 WAT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The months with the highest UV index in Brazzaville are January, March through May, July through September, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: An average UV index of 7 in September transforms into this advice:
Inhibit overexposure. Warding off sun damage is of utmost importance. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.