September weather forecast
Mendewa, Sierra Leone

The first month of the autumn, September, is also a moderately hot month in Mendewa, Sierra Leone, with an average temperature ranging between min 21.8°C (71.2°F) and max 28.6°C (83.5°F).

Temperature

A minor adjustment in Mendewa's average high-temperature is noted with the start of September, touching a still moderately hot 28.6°C (83.5°F) from August's 27.5°C (81.5°F). Throughout the month of September, Mendewa sees a steady low-temperature average of 21.8°C (71.2°F).

Heat index

For most parts of September, the heat index is calculated to be a torrid 36°C (96.8°F). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

August and September, with an average relative humidity of 92%, are the most humid months.

Rainfall

In Mendewa, Sierra Leone, during September, the rain falls for 29.7 days and regularly aggregates up to 265mm (10.43") of precipitation. In Mendewa, during the entire year, the rain falls for 256.6 days and collects up to 1628mm (64.09") of precipitation.

Daylight

In September, the average length of the day in Mendewa is 12h and 10min.
On the first day of the month, sunrise is at 06:37 and sunset at 18:53. On the last day of September, sunrise is at 06:34 and sunset at 18:37 GMT.

Sunshine

The average sunshine in September in Mendewa is 4.5h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 6 during September leads to these advisories:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Enhance your sun protection with tightly woven, yet airy clothing.