Libreville
Gabon
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Libreville, Gabon

Tarmac road beside sandy beaches leading into the Libreville city in Gabon
Tarmac road beside sandy beaches leading into the Libreville city in Gabon
September, the first month of the autumn, in Libreville, is also a moderately hot month, with average temperature varying between 27.5°C (81.5°F) and 23.2°C (73.8°F).

Temperature

In Libreville, the average high-temperature in September is practically the same as in August - a still moderately hot 27.5°C (81.5°F). In Libreville, in September, the average low-temperature is 23.2°C (73.8°F).

Humidity

In Libreville, the average relative humidity is 84%.

Rainfall

In September, the rain falls for 14.5 days. Throughout September, 104mm (4.1") of precipitation is accumulated. Throughout the year, there are 177.4 rainfall days, and 2841.7mm (111.9") of precipitation is accumulated.

Sea temperature

In Libreville, the average seawater temperature in September is 25.7°C (78.3°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

January through December, with an average of 12.1h of daylight, are months with the longest days in Libreville. Months with the shortest days in Libreville are January through December, with an average of 12.1h of daylight.

Sunshine

In Libreville, the average sunshine in September is 3.2h.

UV index

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index in Libreville. A UV Index reading of 11, and higher, represents an extreme threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
The daily maximum UV index of 12 interpret into the following advice:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Libreville?

In September, in Libreville, the average high-temperature is 27.5°C (81.5°F), and the average low-temperature is 23.2°C (73.8°F).

What is the average humidity in September in Libreville?

In Libreville, Gabon, the average relative humidity in September is 84%.

How many days does it rain in September in Libreville?

In Libreville, Gabon, in September, it is raining for 14.5 days, with typically 104mm (4.1") of accumulated precipitation.

What is the sea water temperature in September in Libreville?

In September, the average sea temperature in Libreville, Gabon, is 25.7°C (78.3°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

When are the longest days in Libreville?

Months with the longest days in Libreville are January through December, with an average of 12.1h of daylight.

What is the month with the shortest days in Libreville?

Months with the shortest days in Libreville, Gabon, are January through December, with an average of 12.1h of daylight.

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

In September, the average length of the day in Libreville, Gabon, is 12.1h.

How long on average sun shines in September in Libreville?

In Libreville, Gabon, the average sunshine in September is 3.2h.

What is the month with the highest UV index in Libreville?

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index.

What is the UV index reading in September in Libreville?

In Libreville, the average daily maximum UV index in September is 12. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Libreville, Gabon
  • Average high temperature in September: 27.5°C

The warmest month (with the highest average high temperature) is March (30.2°C).
The month with the lowest average high temperature is July (26.4°C).

  • Average low temperature in September: 23.2°C

The month with the highest average low temperature is January (24.1°C).
The coldest month (with the lowest average low temperature) is August (21.8°C).

Average humidity in September - Libreville, Gabon
  • Average humidity in September: 84%

Months with the highest relative humidity are October and November (87%).
Months with the lowest relative humidity are June, July and August (81%).

Average rainfall in September - Libreville, Gabon
  • Average rainfall in September: 104mm

The wettest month (with the highest rainfall) is November (490mm).
The driest month (with the lowest rainfall) is July (6.6mm).

Average rainfall days in September - Libreville, Gabon
  • Average rainfall days in September: 14.5 days

The month with the highest number of rainy days is October (25 days).
The month with the lowest number of rainy days is July (1.7 days).

Average sea temperature in September - Libreville, Gabon
  • Average sea temperature in September: 25.7°C

The best month for swimming (with the highest average sea temperature) is March (29.3°C).
The coldest month (with the lowest average sea temperature) is July (24.7°C).

Average daylight in September / Average sunshine in September - Libreville, Gabon
  • Average daylight in September: 12.1h

Months with the longest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).
Months with shortest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).

  • Average sunshine in September: 3.2h

The month with most sunshine is February (Average sunshine: 6.3h).
The month with least sunshine is August (Average sunshine: 2.9h).

Average UV index in September - Libreville, Gabon
  • Average UV index in September: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 11).