September weather forecast
Mapaki, Sierra Leone

September

Weather in September

September signals a gradual easing out of the monsoon with a marked decrease in rainfall. Monsoon-loaded months yield to relatively calmer days with the onset of the post-monsoon season. A slower pace in October characterizes a welcoming transition after a long, moist trail of the rainy season. Exception to the typical trend of monsoon months, September registers a drop in average rainfall to 261mm (10.28"). Characterized by receding rains, a teensy uptick in sunshine, and a sustained tropical vibe, September carries Mapaki towards drier days.

Temperature

The ushering in of September brings an average high-temperature of a still moderately hot 28.9°C (84°F), closely mirroring the 27.6°C (81.7°F) of August. An average low-temperature of 21.8°C (71.2°F) is common during the nights of September.

Heat index

In September, the heat index is estimated at a very hot 37°C (98.6°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In Mapaki, the average relative humidity in September is 92%.

Rainfall

In September, the rain falls for 28.6 days. Throughout September, 261mm (10.28") of precipitation is accumulated. In Mapaki, during the entire year, the rain falls for 225.8 days and collects up to 1471mm (57.91") of precipitation.

Daylight

The average length of the day in September is 12h and 10min.
On the first day of the month, sunrise is at 06:39 and sunset at 18:55. On the last day of September, sunrise is at 06:35 and sunset at 18:38 GMT.

Sunshine

In September, the average sunshine in Mapaki is 5.2h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 6 translates into these guidelines:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Stay sun-safe with clothing that is both closely woven and worn loosely.

Frequently asked questions

How hot is September?
In Mapaki, in September, the average high-temperature is 28.9°C (84°F), and the average low-temperature is 21.8°C (71.2°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 37°C (98.6°F).
What is the average humidity in September?
In September, the average relative humidity is 92%.
How many days does it rain in September?
In Mapaki, in September, it is raining for 28.6 days, with typically 261mm (10.28") of accumulated precipitation.
How many hours of daylight does Mapaki have in September?
The average day length in September is 12h and 10min.
What time are sunrise and sunset in September in Mapaki?
In September, on the first day of the month, sunrise is at 06:39 and sunset at 18:55. On the last day of the month, sunrise is at 06:35 and sunset at 18:38 GMT.
How many hours of sunshine does Mapaki have in September?
The average sunshine duration in September is 5.2h.
What is the UV index intensity in September?
In Mapaki, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.
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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September
Mapaki, Sierra Leone
  • Average high temperature in September: 28.9°C

The warmest month (with the highest average high temperature) is March (38.4°C).
The month with the lowest average high temperature is August (27.6°C).

  • Average low temperature in September: 21.8°C

The month with the highest average low temperature is April (24°C).
The coldest month (with the lowest average low temperature) is December (19.7°C).

Average pressure in September
Mapaki, Sierra Leone
  • Average pressure in September: 1013.1mbar

The month with the highest atmospheric pressure is July (1014.1mbar).
The months with the lowest atmospheric pressure are February and March (1010.5mbar).

Average wind speed in September
Mapaki, Sierra Leone
  • Average wind speed in September: 4.7km/h

The windiest month (with the highest average wind speed) is April (5.8km/h).
The calmest month (with the lowest average wind speed) is November (3.3km/h).

Average humidity in September
Mapaki, Sierra Leone
  • Average humidity in September: 92%

The month with the highest relative humidity is August (93%).
The months with the lowest relative humidity are January and February (58%).

Average rainfall in September
Mapaki, Sierra Leone
  • Average rainfall in September: 261mm

The wettest month (with the highest rainfall) is August (332mm).
The driest month (with the least rainfall) is December (3mm).

Average rainfall days in September
Mapaki, Sierra Leone
  • Average rainfall days in September: 28.6 days

The month with the highest number of rainy days is July (30.3 days).
The month with the least rainy days is January (2.2 days).

Average daylight in September /
Average sunshine in September
Mapaki, Sierra Leone
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 36min).
The month with the shortest days is December (Average daylight: 11h and 36min).

  • Average sunshine in September: 5h and 1min

The month with the most sunshine is January (Average sunshine: 9h and 48min).
The month with the least sunshine is August (Average sunshine: 3h and 42min).

Average sunshine days in September
Mapaki, Sierra Leone
  • Average sunshine days in September: 0.7 days

The month with the most sunshine days is January (27.4 days).
The month with the least sunshine days is July (0.5 days).

Average UV index in September
Mapaki, Sierra Leone
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, November and December (UV index 7).
The months with the lowest UV index are July and August (UV index 5).

Average cloud cover in September
Mapaki, Sierra Leone
  • Average cloud cover in September: 76

The month with the most cloud cover is August (Cloud cover 83).
The months with the least cloud cover are January and February (Cloud cover 15).

Average visibility in September
Mapaki, Sierra Leone
  • Average visibility in September: 5km

The months with the highest visibility are February, March and April (10km).
The month with the lowest visibility is September (5km).

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