September weather forecast
Banjul, The Gambia

The cool city of Banjul in the Gambia, with a distant view of the Gambia river
The cool city of Banjul in the Gambia, with a distant view of the Gambia river

September

Weather in September

As Banjul heads towards the final quarter of the year, the weather takes a turn from the intense monsoon experienced in August. Rainfall levels start to diminish, signaling the gradual retreat of the wet season. The city continues to enjoy long days and abundant sunshine, similar to August. One key highlight during this period is the decelerating wind speeds to 12.8km/h (8mph), resulting in calmer weather conditions. Despite the changes, the sea remains pleasantly warm at 28°C (82.4°F), providing enjoyable beach atmospheres.

Temperature

The arrival of September brings an average high-temperature of a still moderately hot 29.5°C (85.1°F), closely following the temperature pattern of August. Banjul, during September nights, observes a steady temperature, averaging at a still moderately hot 26.1°C (79°F).

Heat index

The heat index in September is evaluated at a torrid 36°C (96.8°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

August and September, with an average relative humidity of 80%, are the most humid months.

Rainfall

In Banjul, during September, the rain falls for 17.6 days and regularly aggregates up to 121mm (4.76") of precipitation. In Banjul, during the entire year, the rain falls for 77 days and collects up to 427mm (16.81") of precipitation.

Sea temperature

July through November, with an average sea temperature of 28°C (82.4°F), are months with the warmest seawater.
Note: Swimming, diving, and other water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are highly enjoyable and provide prolonged comfort without unease.

Daylight

In September, the average length of the day is 12h and 12min.
On the first day of September, sunrise is at 06:54 and sunset at 19:17. On the last day of the month, sunrise is at 06:55 and sunset at 18:56 GMT.

Sunshine

In September, the average sunshine is 8.2h.

UV index

The months with the highest UV index in Banjul are January, April through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 7 in September leads to these recommendations:
Shield from overexposure. Defense against sun-related harm is required. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Beware! Reflecting off water and sand, UV rays are much stronger.

Frequently asked questions

How hot does it get in September?
The high-temperature, in September, in Banjul, is 29.5°C (85.1°F), while the low-temperature averages to 26.1°C (79°F). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in September is evaluated at 36°C (96.8°F).
What is the most humid month?
The months with the highest humidity are August and September, with an average relative humidity of 80%.
What is the average humidity in September?
In Banjul, The Gambia, the average relative humidity in September is 80%.
How many days does it rain in September?
In Banjul, The Gambia, during September, the rain falls for 17.6 days and regularly aggregates up to 121mm (4.76") of precipitation.
When is the sea warmest?
July through November, with an average sea temperature of 28°C (82.4°F), are months with the warmest seawater.
What is the sea water temperature in September?
In Banjul, the average seawater temperature in September is 28°C (82.4°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 Banjul have in September?
In Banjul, the average day length in September is 12h and 12min.
When is the sunrise / sunset in September in Banjul?
In September, on the first day of the month, sunrise is at 06:54 and sunset at 19:17. On the last day of the month, sunrise is at 06:55 and sunset at 18:56 GMT.
How many hours of sunshine does Banjul have in September?
In September, the average sunshine duration is 8.2h.
What are the months with the highest UV index?
The months with the highest UV index are January, April through December, with an average maximum UV index of 7.
What is the UV index intensity in September?
In September, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September
Banjul, The Gambia
  • Average high temperature in September: 29.5°C

The warmest month (with the highest average high temperature) is November (31.8°C).
The month with the lowest average high temperature is May (28.1°C).

  • Average low temperature in September: 26.1°C

The month with the highest average low temperature is October (26.9°C).
The coldest month (with the lowest average low temperature) is February (21.6°C).

Average pressure in September
Banjul, The Gambia
  • Average pressure in September: 1012mbar

The month with the highest atmospheric pressure is July (1012.6mbar).
The month with the lowest atmospheric pressure is April (1010.3mbar).

Average wind speed in September
Banjul, The Gambia
  • Average wind speed in September: 12.8km/h

The windiest month (with the highest average wind speed) is February (18.6km/h).
The calmest month (with the lowest average wind speed) is September (12.8km/h).

Average humidity in September
Banjul, The Gambia
  • Average humidity in September: 80%

The months with the highest relative humidity are August and September (80%).
The month with the lowest relative humidity is January (39%).

Average rainfall in September
Banjul, The Gambia
  • Average rainfall in September: 121mm

The wettest month (with the highest rainfall) is August (177mm).
The driest months (with the least rainfall) are January, February and December (0mm).

Average rainfall days in September
Banjul, The Gambia
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is August (21.6 days).
The month with the least rainy days is February (0.2 days).

Average sea temperature in September
Banjul, The Gambia
  • Average sea temperature in September: 28°C

The best months for swimming (with the highest average sea temperature) are July, August, September, October and November (28°C).
The coldest months (with the lowest average sea temperature) are February and March (21°C).

Average daylight in September /
Average sunshine in September
Banjul, The Gambia
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 24min).

  • Average sunshine in September: 8h and 1min

The months with the most sunshine are March, April and May (Average sunshine: 9h and 54min).
The month with the least sunshine is August (Average sunshine: 7h and 18min).

Average sunshine days in September
Banjul, The Gambia
  • Average sunshine days in September: 10.4 days

The months with the most sunshine days are January and December (30.7 days).
The month with the least sunshine days is August (7.3 days).

Average UV index in September
Banjul, The Gambia
  • Average UV index in September: 7

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

Average cloud cover in September
Banjul, The Gambia
  • Average cloud cover in September: 37

The month with the most cloud cover is August (Cloud cover 50).
The month with the least cloud cover is April (Cloud cover 6).

Average visibility in September
Banjul, The Gambia
  • Average visibility in September: 10km

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

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