September weather forecast
Niamey, Niger

As the wet season draws to a close, September in Niamey witnesses a gradual return of the hot and arid conditions typical of this Sahelian landscape. A fair decrease in rainfall from August's peak is observed, dropping more than a threefold to 9mm (0.35"). Winds blowing at an average of 11.6km/h (7.2mph) help to keep the temperature under control. Breaks in the cloud appear more frequently, signalling the imminent end of the wet season. Steady daylight indicates consistency in tropical weather, with high visibility dissuading the onset of any fog-like conditions.

Temperature

The advent of September in Niamey reveals an average high-temperature of a torrid 36.7°C (98.1°F), showing minimal difference from the prior month. Niamey registers a consistent average low-temperature of 26.9°C (80.4°F) during September.

Heat index

September's mean heat index is calculated to be a blistering 44°C (111.2°F). Alert: Heat cramps and heat exhaustion are likely to occur. Prolonged exertion can lead to heatstroke.
Heat index determinations are made taking into account the shade and light air movements. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In Niamey, the average relative humidity in September is 48%.

Rainfall

In Niamey, Niger, in September, it is raining for 4.2 days, with typically 9mm (0.35") of accumulated precipitation. Throughout the year, in Niamey, Niger, there are 34.7 rainfall days, and 99mm (3.9") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 12min.
On the first day of September, sunrise is at 06:40 and sunset at 19:02. On the last day of the month, sunrise is at 06:40 and sunset at 18:41 WAT.

Sunshine

In Niamey, the average sunshine in September is 9.7h.

UV index

In September, the average daily maximum UV index in Niamey is 8. A UV Index value of 8 to 10 symbolizes a very high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 8 during September translates into these guidelines:
Be sure to take precautions. Without protection, skin might suffer damage quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.