September weather forecastMattru, Sierra Leone
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Mattru, Sierra Leone, with an average temperature ranging between max 27.9°C (82.2°F) and min 24°C (75.2°F).Temperature
Mattru's average high-temperature in September is a still moderately hot 27.9°C (82.2°F), indicating a subtle variation from August. In Mattru, the month of September records an average minimum temperature of 24°C (75.2°F), a slight dip from the daily highs.Heat index
The heat index in September is estimated at a tropical 33°C (91.4°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.The standards for the heat index are set for locations in shade and under light breezes. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. 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 largely significant for babies and toddlers. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
Humidity
September is the most humid month, with an average relative humidity of 86%.Rainfall
In Mattru, during September, the rain falls for 27.8 days and regularly aggregates up to 259mm (10.2") of precipitation. Throughout the year, there are 238.8 rainfall days, and 1773mm (69.8") of precipitation is accumulated.Daylight
In Mattru, the average length of the day in September is 12h and 10min.On the first day of September in Mattru, sunrise is at 06:40 and sunset at 18:55. On the last day of the month, sunrise is at 06:36 and sunset at 18:40 GMT.
Sunshine
The average sunshine in September is 5.5h.UV index
The months with the highest UV index are January through June, September through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: A maximum high UV index of 7 in September translates into the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mattru, Sierra Leone
- Average high temperature in September: 27.9°C
The warmest month (with the highest average high temperature) is April (32.1°C).
The month with the lowest average high temperature is August (27.3°C).
- Average low temperature in September: 24°C
The month with the highest average low temperature is May (26.1°C).
The coldest month (with the lowest average low temperature) is January (23.8°C).
Average pressure in September
Mattru, Sierra Leone
- Average pressure in September: 1012.9mbar
The month with the highest atmospheric pressure is July (1013.9mbar).
The months with the lowest atmospheric pressure are February and March (1010.4mbar).
Average wind speed in September
Mattru, Sierra Leone
- Average wind speed in September: 9.9km/h
The windiest month (with the highest average wind speed) is August (13.1km/h).
The calmest month (with the lowest average wind speed) is November (6.6km/h).
Average humidity in September
Mattru, Sierra Leone
- Average humidity in September: 86%
The month with the highest relative humidity is September (86%).
The months with the lowest relative humidity are January and February (72%).
Average rainfall in September
Mattru, Sierra Leone
- Average rainfall in September: 259mm
The wettest month (with the highest rainfall) is August (389mm).
The driest month (with the least rainfall) is February (5mm).
Average rainfall days in September
Mattru, Sierra Leone
- Average rainfall days in September: 27.8 days
The month with the highest number of rainy days is July (29.4 days).
The month with the least rainy days is February (4.5 days).
Average daylight in September /
Average sunshine in September
Mattru, Sierra Leone
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in September: 5h and 30min
The month with the most sunshine is January (Average sunshine: 9h and 30min).
The month with the least sunshine is August (Average sunshine: 3h and 48min).
Average sunshine days in September
Mattru, Sierra Leone
- Average sunshine days in September: 1.2 days
The month with the most sunshine days is January (24.1 days).
The month with the least sunshine days is June (1 days).
Average UV index in September
Mattru, Sierra Leone
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, September, October, November and December (UV index 7).
The months with the lowest UV index are July and August (UV index 6).
Average cloud cover in September
Mattru, Sierra Leone
- Average cloud cover in September: 62
The month with the most cloud cover is August (Cloud cover 74).
The month with the least cloud cover is January (Cloud cover 18).
Average visibility in September
Mattru, Sierra Leone
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, November and December (10km).
The months with the lowest visibility are July, August, September and October (9km).
