September weather forecastOnianva, Congo

Weather in September

September brings increased humidity and a significant rise in rainfall in Onianva, Congo. The striking characteristic of September's weather is the 130mm (5.12") of rainfall, which again enhances the city’s tropical climate. The general weather sees an increase in the number of rainy days with consequent cloud cover. Daylight and sunshine hours remain steady, while wind speed slightly improves, offering rejuvenating bouts of breezes.

Temperature

September's average high-temperature in Onianva stands at a still hot 31.4°C (88.5°F), showing little deviation from August's 32.9°C (91.2°F). Throughout the month of September, Onianva witnesses an average temperature of 22.7°C (72.9°F).

Heat index

The heat index value during September is estimated at a scorching 40°C (104°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Understanding the heat index involves considering values for shaded locales with light wind. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. 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.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

The average relative humidity in September is 73%.

Rainfall

In Onianva, Congo, during September, the rain falls for 27.5 days and regularly aggregates up to 130mm (5.12") of precipitation. Throughout the year, there are 276.3 rainfall days, and 1248mm (49.13") of precipitation is accumulated.

Daylight

In Onianva, the average length of the day in September is 12h and 6min.
On the first day of September, sunrise is at 05:54 and sunset at 17:58. On the last day of the month, sunrise is at 05:42 and sunset at 17:50 WAT.

Sunshine

In Onianva, Congo, the average sunshine in September is 8.4h.

UV index

The month with the lowest UV index in Onianva, Congo, is September, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.
Note: In September, the UV index of 6 transforms into the following advice:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.