September weather forecast
Banjul, The Gambia

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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

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

September experiences an average high-temperature of a still warm 29.5°C (85.1°F), barely different from August's 29.1°C (84.4°F). Banjul in September experiences a minor decline in temperature, with an average low of 26.1°C (79°F) at night.

Heat index

During September, the heat index is evaluated at a torrid 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

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

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 in Banjul.
Note: In water temperatures ranging between 25°C (77°F) and 29°C (84.2°F), activities such as swimming and diving become highly pleasurable for long durations.

Daylight

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

Sunshine

The average sunshine in September is 8.2h.

UV index

The months with the highest UV index are January, April through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 7 during September leads to these advisories:
Inhibit overexposure. Warding off sun damage is of utmost importance. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be alert! The reflection of water and sand augments UV radiation intensity.

Frequently asked questions

How hot is September in Banjul?

During September, Banjul experiences an average high-temperature of 29.5°C (85.1°F) and a low-temperature of 26.1°C (79°F). The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in September is evaluated at 36°C (96.8°F).

What are the most humid months?

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 September, the average relative humidity is 80%.

How many days does it rain in September?

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

What are the months with the warmest sea water?

The months with the warmest seawater are July through November, with an average sea temperature of 28°C (82.4°F).

What is the 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.

What is the average length of the day in September?

The average day length in September is 12h and 12min.

What time are sunrise and sunset in September?

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.

How long on average sun shines in September in Banjul?

The average sunshine duration in September is 8.2h.

What is the month 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 reading in September?

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

Average temperature in September
Banjul, The Gambia

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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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).

Banjul, The Gambia

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