September weather forecastBiri, Cameroon
September
Weather in September
September, the first month of the autumn in Biri, is a tropical month, with an average temperature fluctuating between 30.2°C (86.4°F) and 21.5°C (70.7°F).Temperature
As Biri steps into September, the average high-temperature holds at a hot 30.2°C (86.4°F), hinting at a minor fluctuation from the prior month. Biri throughout September, records an average low-temperature of 21.5°C (70.7°F).Heat index
During September, the heat index is appraised at a torrid 37°C (98.6°F). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.Metrics for the heat index primarily focus on shaded spots and light wind conditions. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In Biri, the average relative humidity in September is 75%.Rainfall
In Biri, in September, during 25.4 rainfall days, 110mm (4.33") of precipitation is typically accumulated. In Biri, during the entire year, the rain falls for 139.5 days and collects up to 730mm (28.74") of precipitation.Daylight
In Biri, the average length of the day in September is 12h and 11min.On the first day of the month, sunrise is at 05:57 and sunset at 18:15. On the last day of September, sunrise is at 05:54 and sunset at 17:57 WAT.
Sunshine
The average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 7 during September leads to these instructions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Biri, Cameroon
- Average high temperature in September: 30.2°C
The warmest month (with the highest average high temperature) is March (38.8°C).
The month with the lowest average high temperature is August (28.2°C).
- Average low temperature in September: 21.5°C
The month with the highest average low temperature is May (25.8°C).
The coldest month (with the lowest average low temperature) is January (16.6°C).
Average pressure in September
Biri, Cameroon
- Average pressure in September: 1010.9mbar
The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is April (1006.6mbar).
Average wind speed in September
Biri, Cameroon
- Average wind speed in September: 5.2km/h
The windiest months (with the highest average wind speed) are February and March (8.9km/h).
The calmest month (with the lowest average wind speed) is September (5.2km/h).
Average humidity in September
Biri, Cameroon
- Average humidity in September: 75%
The month with the highest relative humidity is August (82%).
The months with the lowest relative humidity are February and March (16%).
Average rainfall in September
Biri, Cameroon
- Average rainfall in September: 110mm
The wettest month (with the highest rainfall) is August (215mm).
The driest months (with the least rainfall) are January, February and December (0mm).
Average rainfall days in September
Biri, Cameroon
- Average rainfall days in September: 25.4 days
The month with the highest number of rainy days is August (29.5 days).
The months with the least rainy days are January, February and December (0 days).
Average daylight in September /
Average sunshine in September
Biri, Cameroon
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 30min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is May (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 7h and 42min).
Average sunshine days in September
Biri, Cameroon
- Average sunshine days in September: 2.6 days
The months with the most sunshine days are January and December (31 days).
The month with the least sunshine days is August (1 days).
Average UV index in September
Biri, Cameroon
- Average UV index in September: 7
The months with the highest UV index are March and April (UV index 8).
The months with the lowest UV index are July, August and December (UV index 6).
Average cloud cover in September
Biri, Cameroon
- Average cloud cover in September: 32
The month with the most cloud cover is August (Cloud cover 48).
The months with the least cloud cover are January and December (Cloud cover 1).
Average visibility in September
Biri, Cameroon
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, October, November and December (10km).
The month with the lowest visibility is August (8km).
