September weather forecast
Porto Novo, Benin

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

Weather in September

In September, after the highs of the rainy season, Porto Novo commences its transition to warmer and drier conditions. The rainfall escalates back to 64mm (2.52") spread over 19 days while temperatures start getting back to around 29.5°C (85.1°F). Despite the uptick in temperature, residents can breathe easy as the heat is still considerably mild when viewed in the wider context of the city's climate. The relief from excessive rainfall leads into October when rainfall recedes, and warmer temperatures resume.

Temperature

September in Porto Novo denotes a minimal variation in the average high-temperature to a still moderately hot 29.5°C (85.1°F) from August's 28.7°C (83.7°F). An average low-temperature of 23.9°C (75°F) is observed during September nights in Porto Novo.

Heat index

Throughout September, the heat index is evaluated at a torrid 36°C (96.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

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

Rainfall

In September, the rain falls for 19 days. Throughout September, 64mm (2.52") of precipitation is 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 Porto Novo, the average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:42 and sunset at 18:56. On the last day of September, sunrise is at 06:37 and sunset at 18:41 WAT.

Sunshine

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

UV index

June, July and September, with an average maximum UV index of 6, are months with the lowest UV index in Porto Novo. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: A daily maximum UV index of 6 in September translates into the following instructions:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.

Frequently asked questions

Is it hot in Porto Novo during September?

The high-temperature, in September, in Porto Novo, records 29.5°C (85.1°F), while the low-temperature is 23.9°C (75°F). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 36°C (96.8°F).

What are the most humid months in Porto Novo?

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

What is the average humidity in September in Porto Novo?

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

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

In Porto Novo, in September, during 19 rainfall days, 64mm (2.52") of precipitation is typically accumulated.

How many hours of daylight does Porto Novo have in September?

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?

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

How many hours of sunshine does Porto Novo have in September?

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

What are the months with the lowest UV index in Porto Novo?

The months with the lowest UV index 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 hazard to health from unprotected exposure to UV radiation.

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).

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).

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).

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%).

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).

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).

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 1min

The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 48min).

  • Average sunshine in September: 6h and 2min

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).

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).

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).

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).

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).

Porto Novo, Benin

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