September weather forecast
Porto Novo, Benin

The Nokoue Lake and city of Porto Novo, Benin
The Nokoue Lake and city of Porto Novo, Benin

Weather in September

The first month of the autumn, September, is also a moderately hot month in Porto Novo, Benin, with an average temperature ranging between min 23.9°C (75°F) and max 29.5°C (85.1°F).

Temperature

In Porto Novo, the average high-temperature in September is almost the same as in August - a still warm 29.5°C (85.1°F). The average low-temperature, in Porto Novo, is 23.9°C (75°F).

Heat index

The average heat index in September is computed to be a torrid 36.4°C (97.5°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, metabolic differences, differences in body mass, height, and shape), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

July through September, with an average relative humidity of 81%, are the most humid months in Porto Novo.

Rainfall

In Porto Novo, in September, during 19 rainfall days, 64mm (2.52") of precipitation is typically accumulated. In Porto Novo, during the entire year, the rain falls for 148.7 days and collects up to 481mm (18.94") of precipitation.

Daylight

In September, the average length of the day in Porto Novo, Benin, is 12h and 10min.
On the first day of September, sunrise is at 06:42 and sunset at 18:56. On the last day of the month, sunrise is at 06:37 and sunset at 18:41 WAT.

Sunshine

In September, the average sunshine in Porto Novo is 6.3h.

UV index

June, July and September, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Porto Novo?

The average high-temperature, in September, in Porto Novo, Benin, is 29.5°C (85.1°F), while the average low-temperature is 23.9°C (75°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 36.4°C (97.5°F).

What is the most humid month in Porto Novo?

The months with the highest humidity are July through September, with an average relative humidity of 81%.

What is the average humidity in September in Porto Novo?

In Porto Novo, Benin, the average relative humidity in September is 81%.

How many days does it rain in September in Porto Novo?

In September, in Porto Novo, the rain falls for 19 days. Throughout September, 64mm (2.52") of precipitation is accumulated.

What is the average length of the day in September in Porto Novo?

In Porto Novo, Benin, the average day length in September is 12h and 10min.

What time are sunrise and sunset in September in Porto Novo?

On the first day of September, sunrise is at 06:42 and sunset at 18:56. On the last day of the month, sunrise is at 06:37 and sunset at 18:41 WAT.

How long on average sun shines in September in Porto Novo?

In September, the average sunshine duration in Porto Novo, Benin, is 6.3h.

When is the lowest UV index in Porto Novo?

The months with the lowest UV index in Porto Novo are June, July and September, with an average maximum UV index of 6.

How high is the UV index in September in Porto Novo?

In September, the average daily maximum UV index in Porto Novo is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in September
Porto Novo, Benin

Average temperature in September - Porto Novo, Benin
  • Average high temperature in September: 29.5°C

The warmest month (with the highest average high temperature) is January (33.8°C).
The month with the lowest average high temperature is August (28.7°C).

  • Average low temperature in September: 23.9°C

The month with the highest average low temperature is April (26.8°C).
The coldest month (with the lowest average low temperature) is August (23.4°C).

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Average pressure in September
Porto Novo, Benin

Average pressure in September - Porto Novo, Benin
  • Average pressure in September: 1012.6mbar

The month with the highest atmospheric pressure is July (1013.4mbar).
The months with the lowest atmospheric pressure are February and March (1009.4mbar).

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Average wind speed in September
Porto Novo, Benin

Average wind speed in September - Porto Novo, Benin
  • Average wind speed in September: 11.1km/h

The windiest month (with the highest average wind speed) is August (13.4km/h).
The calmest month (with the lowest average wind speed) is December (8.8km/h).

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Average humidity in September
Porto Novo, Benin

Average humidity in September - Porto Novo, Benin
  • Average humidity in September: 81%

The months with the highest relative humidity are July, August and September (81%).
The month with the lowest relative humidity is January (67%).

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Average rainfall in September
Porto Novo, Benin

Average rainfall in September - Porto Novo, Benin
  • Average rainfall in September: 64mm

The wettest months (with the highest rainfall) are June and July (110mm).
The driest month (with the least rainfall) is December (7mm).

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Average rainfall days in September
Porto Novo, Benin

Average rainfall days in September - Porto Novo, Benin
  • Average rainfall days in September: 19 days

The month with the highest number of rainy days is July (23.9 days).
The month with the least rainy days is January (4.8 days).

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Average daylight in September /
Average sunshine in September
Porto Novo, Benin

Average daylight in September / Average sunshine in September - Porto Novo, Benin
  • Average daylight in September: 12h and 10min

The month with the longest days is June (Average daylight: 12h and 29min).
The month with the shortest days is December (Average daylight: 11h and 46min).

  • Average sunshine in September: 6h and 18min

The month with the most sunshine is December (Average sunshine: 9h and 36min).
The month with the least sunshine is July (Average sunshine: 5h and 24min).

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Average sunshine days in September
Porto Novo, Benin

Average sunshine days in September - Porto Novo, Benin
  • Average sunshine days in September: 8.4 days

The month with the most sunshine days is January (24.9 days).
The month with the least sunshine days is July (4.5 days).

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Average UV index in September
Porto Novo, Benin

Average UV index in September - Porto Novo, Benin
  • Average UV index in September: 6

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

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Average cloud cover in September
Porto Novo, Benin

Average cloud cover in September - Porto Novo, Benin
  • Average cloud cover in September: 55

The month with the most cloud cover is August (Cloud cover 61).
The month with the least cloud cover is December (Cloud cover 15).

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Average visibility in September
Porto Novo, Benin

Average visibility in September - Porto Novo, Benin
  • Average visibility in September: 10km

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).

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