September weather forecastKoidu, Sierra Leone
September
Weather in September
In the city of Koidu, September marks the beginning of the departure from the rainy season. The noticeable decrease in rainfall validates this change, dropping to 297mm (11.69"). The cloud coverage retreats a little, allowing a slight increase in sunshine hours. However, humidity levels remain high, causing a lingering dampness in the air. As September progresses, it progressively paves the way towards a dryer October.Temperature
Koidu's September reports an average high-temperature of a still moderately hot 27.5°C (81.5°F), exhibiting a minor difference from August. In September, the recorded average low-temperature is an agreeable 20.5°C (68.9°F).Heat index
September's mean heat index is evaluated at a hot 33°C (91.4°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.Be informed that the heat index values are oriented around shady conditions and gentle breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
The average relative humidity in September is 93%.Rainfall
In Koidu, in September, it is raining for 30 days, with typically 297mm (11.69") of accumulated precipitation. In Koidu, Sierra Leone, during the entire year, the rain falls for 252.4 days and collects up to 1704mm (67.09") 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 06:35 and sunset at 18:52. On the last day of September, sunrise is at 06:32 and sunset at 18:35 GMT.
Sunshine
In September, the average sunshine is 4.9h.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 unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 6 during September translates into the following recommendations:
Guard against overexposure. Protection from sun-induced harm is essential. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Koidu, Sierra Leone
- Average high temperature in September: 27.5°C
The warmest month (with the highest average high temperature) is March (36.1°C).
The month with the lowest average high temperature is August (26.1°C).
- Average low temperature in September: 20.5°C
The month with the highest average low temperature is April (22.1°C).
The coldest month (with the lowest average low temperature) is December (17.5°C).
Average pressure in September
Koidu, Sierra Leone
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is March (1010.6mbar).
Average wind speed in September
Koidu, Sierra Leone
- Average wind speed in September: 4.3km/h
The windiest month (with the highest average wind speed) is April (5.5km/h).
The calmest month (with the lowest average wind speed) is November (3.3km/h).
Average humidity in September
Koidu, Sierra Leone
- Average humidity in September: 93%
The month with the highest relative humidity is August (94%).
The month with the lowest relative humidity is January (49%).
Average rainfall in September
Koidu, Sierra Leone
- Average rainfall in September: 297mm
The wettest month (with the highest rainfall) is August (319mm).
The driest month (with the least rainfall) is December (7mm).
Average rainfall days in September
Koidu, Sierra Leone
- Average rainfall days in September: 30 days
The month with the highest number of rainy days is August (30.8 days).
The months with the least rainy days are January and December (3.3 days).
Average daylight in September /
Average sunshine in September
Koidu, Sierra Leone
- Average daylight in September: 12h and 12min
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: 4h and 54min
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 0min).
Average sunshine days in September
Koidu, Sierra Leone
- Average sunshine days in September: 0 days
The month with the most sunshine days is January (26.1 days).
The month with the least sunshine days is September (0 days).
Average UV index in September
Koidu, Sierra Leone
- Average UV index in September: 6
The months with the highest UV index are January, February and March (UV index 7).
The months with the lowest UV index are June, July, August and October (UV index 5).
Average cloud cover in September
Koidu, Sierra Leone
- Average cloud cover in September: 78
The month with the most cloud cover is August (Cloud cover 87).
The month with the least cloud cover is January (Cloud cover 13).
Average visibility in September
Koidu, Sierra Leone
- Average visibility in September: 5km
The months with the highest visibility are January, February, March and December (9km).
The months with the lowest visibility are August and September (5km).
