September weather forecast
Bissau, Guinea-Bissau

Trees along the golden sandy shores of Bijagos Islands in Bissau, Guinea Bissau in West Africa
Trees along the golden sandy shores of Bijagos Islands in Bissau, Guinea Bissau in West Africa

Weather in September

September, the first month of the autumn in Bissau, is also a hot month, with an average temperature ranging between max 30°C (86°F) and min 22.8°C (73°F).

Temperature

In Bissau, the average high-temperature in September remains the same as in August - a still tropical 30°C (86°F). The average low-temperature, is 22.8°C (73°F).

Rainfall

In Bissau, Guinea-Bissau, in September, during 19 rainfall days, 435mm (17.13") of precipitation is typically accumulated. In Bissau, during the entire year, the rain falls for 86 days and collects up to 2023mm (79.65") of precipitation.

Sea temperature

In September, the average sea temperature in Bissau is 28.3°C (82.9°F).
Note: 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.

Daylight

In September, the average length of the day is 12h and 11min.
On the first day of the month, sunrise is at 06:52 and sunset at 19:12. On the last day of September, in Bissau, sunrise is at 06:51 and sunset at 18:53 GMT.

Sunshine

In September, the average sunshine is 6h.

UV index

The months with the highest UV index in Bissau are February through September, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Bissau?

The average high-temperature, in September, in Bissau, Guinea-Bissau, is 30°C (86°F), while the average low-temperature is 22.8°C (73°F).

How many days does it rain in September in Bissau?

In September, in Bissau, the rain falls for 19 days. Throughout September, 435mm (17.13") of precipitation is accumulated.

How warm is the water in September in Bissau?

In Bissau, the average seawater temperature in September is 28.3°C (82.9°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.

How many hours of daylight does Bissau have in September?

In Bissau, Guinea-Bissau, the average day length in September is 12h and 11min.

What time are sunrise and sunset in September in Bissau?

On the first day of September, sunrise is at 06:52 and sunset at 19:12. On the last day of the month, sunrise is at 06:51 and sunset at 18:53 GMT.

How many hours of sunshine does Bissau have in September?

In September, the average sunshine duration in Bissau is 6h.

What are the months with the highest UV index in Bissau?

February through September, with an average maximum UV index of 12, are months with the highest UV index.

What is the UV index reading in September in Bissau?

The average daily maximum UV index in September in Bissau, Guinea-Bissau, is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from unprotected exposure to UV radiation.
Average high temperature
Average rainfall days
Average sunshine
Average UV index

Average temperature in September
Bissau, Guinea-Bissau

Average temperature in September - Bissau, Guinea-Bissau
  • Average high temperature in September: 30°C

The warmest month (with the highest average high temperature) is March (33.9°C).
The month with the lowest average high temperature is July (29.4°C).

  • Average low temperature in September: 22.8°C

The months with the highest average low temperature are June, July, August, September and October (22.8°C).
The coldest month (with the lowest average low temperature) is January (17.8°C).

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Average rainfall in September
Bissau, Guinea-Bissau

Average rainfall in September - Bissau, Guinea-Bissau
  • Average rainfall in September: 434.9mm

The wettest month (with the highest rainfall) is August (682.5mm).
The driest months (with the least rainfall) are January and March (0.5mm).

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Average rainfall days in September
Bissau, Guinea-Bissau

Average rainfall days in September - Bissau, Guinea-Bissau
  • Average rainfall days in September: 19 days

The month with the highest number of rainy days is August (22 days).
The months with the least rainy days are January, February and March (0 days).

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Average sea temperature in September
Bissau, Guinea-Bissau

Average sea temperature in September - Bissau, Guinea-Bissau
  • Average sea temperature in September: 28.3°C

The best months for swimming (with the highest average sea temperature) are October and November (28.8°C).
The coldest month (with the lowest average sea temperature) is February (24.8°C).

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Average daylight in September /
Average sunshine in September
Bissau, Guinea-Bissau

Average daylight in September / Average sunshine in September - Bissau, Guinea-Bissau
  • Average daylight in September: 12h and 11min

The month with the longest days is June (Average daylight: 12h and 49min).
The month with the shortest days is December (Average daylight: 11h and 26min).

  • Average sunshine in September: 6h

The months with the most sunshine are March and April (Average sunshine: 9h).
The month with the least sunshine is August (Average sunshine: 5h).

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Average UV index in September
Bissau, Guinea-Bissau

Average UV index in September - Bissau, Guinea-Bissau
  • Average UV index in September: 12

The months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).

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