September weather forecast
Onianva, Congo

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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.
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Frequently asked questions

How hot is it in Onianva in September?

During September, Onianva experiences an average high-temperature of 31.4°C (88.5°F) and a low-temperature of 22.7°C (72.9°F). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 40°C (104°F).

What is the average humidity in September in Onianva?

The average relative humidity in September in Onianva is 73%.

How much does it rain in Onianva in September?

In Onianva, in September, during 27.5 rainfall days, 130mm (5.12") of precipitation is typically accumulated.

What is the average length of the day in September in Onianva?

The average day length in September in Onianva, Congo, is 12h and 6min.

When are sunrise and sunset in September in Onianva?

In September, on the first day of the month, sunrise is at 05:54 and sunset at 17:58. On the last day of the month, in Onianva, Congo, sunrise is at 05:42 and sunset at 17:50 WAT.

How many hours of sunshine does Onianva have in September?

In September, the average sunshine duration is 8.4h.

What is the month with the lowest UV index in Onianva?

September is the month with the lowest UV index in Onianva, Congo, with an average maximum UV index of 6.

What is the UV index intensity in September in Onianva?

In September, the average daily maximum UV index in Onianva, Congo, is 6. A UV Index of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Onianva, Congo

Average temperature in September - Onianva, Congo
  • Average high temperature in September: 31.4°C

The warmest month (with the highest average high temperature) is July (33.3°C).
The month with the lowest average high temperature is November (30°C).

  • Average low temperature in September: 22.7°C

The month with the highest average low temperature is August (23.5°C).
The coldest month (with the lowest average low temperature) is November (22.1°C).

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Average pressure in September
Onianva, Congo

Average pressure in September - Onianva, Congo
  • Average pressure in September: 1011.6mbar

The month with the highest atmospheric pressure is June (1012.1mbar).
The month with the lowest atmospheric pressure is February (1009.3mbar).

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Average wind speed in September
Onianva, Congo

Average wind speed in September - Onianva, Congo
  • Average wind speed in September: 6.1km/h

The windiest month (with the highest average wind speed) is August (6.6km/h).
The calmest month (with the lowest average wind speed) is November (5.1km/h).

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Average humidity in September
Onianva, Congo

Average humidity in September - Onianva, Congo
  • Average humidity in September: 73%

The months with the highest relative humidity are October and November (81%).
The month with the lowest relative humidity is July (57%).

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Average rainfall in September
Onianva, Congo

Average rainfall in September - Onianva, Congo
  • Average rainfall in September: 130mm

The wettest month (with the highest rainfall) is October (216mm).
The driest month (with the least rainfall) is July (21mm).

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Average rainfall days in September
Onianva, Congo

Average rainfall days in September - Onianva, Congo
  • Average rainfall days in September: 27.5 days

The month with the highest number of rainy days is October (30.3 days).
The month with the least rainy days is July (13.2 days).

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Average daylight in September /
Average sunshine in September
Onianva, Congo

Average daylight in September / Average sunshine in September - Onianva, Congo
  • Average daylight in September: 12h and 1min

The month with the longest days is December (Average daylight: 12h and 18min).
The month with the shortest days is June (Average daylight: 12h and 0min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is January (Average sunshine: 10h and 18min).
The month with the least sunshine is October (Average sunshine: 7h and 36min).

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Average sunshine days in September
Onianva, Congo

Average sunshine days in September - Onianva, Congo
  • Average sunshine days in September: 1.4 days

The month with the most sunshine days is July (15.9 days).
The month with the least sunshine days is October (0.4 days).

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Average UV index in September
Onianva, Congo

Average UV index in September - Onianva, Congo
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 7).
The month with the lowest UV index is September (UV index 6).

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Average cloud cover in September
Onianva, Congo

Average cloud cover in September - Onianva, Congo
  • Average cloud cover in September: 40

The month with the most cloud cover is October (Cloud cover 47).
The months with the least cloud cover are June and July (Cloud cover 27).

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Average visibility in September
Onianva, Congo

Average visibility in September - Onianva, Congo
  • Average visibility in September: 9km

The months with the highest visibility are February, June, July and August (10km).
The months with the lowest visibility are October and November (8km).

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Onianva, Congo

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