Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
Mendewa's September average high-temperature settles at a still moderately hot 28.6°C (83.5°F), showing a near match with the preceding month. Mendewa experiences a mean low-temperature of 21.8°C (71.2°F) during September.Heat index
For September, the heat index is calculated to be a very hot 36°C (96.8°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.Factoring in the heat index, values are geared towards shaded areas with light breezes. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.
Humidity
The months with the highest humidity are August and September, with an average relative humidity of 92%.Rainfall
In September, the rain falls for 29.7 days. Throughout September, 265mm (10.43") of precipitation is accumulated. In Mendewa, Sierra Leone, 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 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
In Mendewa, the average sunshine in September 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 threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 6 during September leads to these advisories:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What are the most humid months?
What is the average humidity in September?
How much does it rain in September?
How many hours of daylight does Mendewa have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Mendewa have in September?
What is the UV index reading in September?
Average temperature in September
Mendewa, Sierra Leone
- Average high temperature in September: 28.6°C
The warmest months (with the highest average high temperature) are February and March (36.8°C).
The month with the lowest average high temperature is August (27.5°C).
- Average low temperature in September: 21.8°C
The month with the highest average low temperature is April (23.8°C).
The coldest month (with the lowest average low temperature) is January (20.1°C).
Average pressure in September
Mendewa, 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
Mendewa, Sierra Leone
- Average wind speed in September: 5km/h
The windiest month (with the highest average wind speed) is April (5.9km/h).
The calmest month (with the lowest average wind speed) is November (3.5km/h).
Average humidity in September
Mendewa, Sierra Leone
- Average humidity in September: 92%
The months with the highest relative humidity are August and September (92%).
The month with the lowest relative humidity is February (66%).
Average rainfall in September
Mendewa, Sierra Leone
- Average rainfall in September: 265mm
The wettest month (with the highest rainfall) is August (341mm).
The driest month (with the least rainfall) is January (5mm).
Average rainfall days in September
Mendewa, Sierra Leone
- Average rainfall days in September: 29.7 days
The month with the highest number of rainy days is August (30.5 days).
The month with the least rainy days is January (4.3 days).
Average daylight in September /
Average sunshine in September
Mendewa, 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 42min).
- Average sunshine in September: 4h and 3min
The month with the most sunshine is January (Average sunshine: 9h and 36min).
The month with the least sunshine is August (Average sunshine: 3h and 6min).
Average sunshine days in September
Mendewa, Sierra Leone
- Average sunshine days in September: 0.2 days
The month with the most sunshine days is January (25.3 days).
The month with the least sunshine days is September (0.2 days).
Average UV index in September
Mendewa, 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
Mendewa, Sierra Leone
- Average cloud cover in September: 79
The month with the most cloud cover is August (Cloud cover 85).
The month with the least cloud cover is January (Cloud cover 23).
Average visibility in September
Mendewa, Sierra Leone
- Average visibility in September: 6km
The months with the highest visibility are February, March and April (9km).
The months with the lowest visibility are June, July, August, September, October and November (6km).
