September weather forecastFreetown, Sierra Leone
September
Weather in September
September signals a change in the persistent rainy weather of Freetown as there is a significant drop in rainfall. Although temperatures rise slightly, the intense humidity makes the warmth feel more oppressive. The sea remains cool, offering a refreshing diversion from the muggy weather. Compared to August, wind speed calms, does enhance sea-side enjoyment. The telling weather condition of September is the 220mm (8.66") rainfall, indicating the gradual retreat of wet season.Temperature
The advent of September in Freetown signifies a minor shift to an average high-temperature of a still warm 28.1°C (82.6°F), aligning closely with August. In September, a low-temperature average of 24.4°C (75.9°F) is characteristic of Freetown, marking a minor shift from daytime temperatures.Heat index
During September, the heat index is computed to be a hot 33°C (91.4°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.It is crucial to understand that heat index figures are for shade and gentle wind conditions. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', melds the effects of warmth and moisture to generate a feeling of heat. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are essentially critical for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
Humidity
The average relative humidity in September is 85%.Rainfall
In September, the rain falls for 28.6 days. Throughout September, 220mm (8.66") of precipitation is accumulated. Throughout the year, in Freetown, there are 205.9 rainfall days, and 1507mm (59.33") of precipitation is accumulated.Sea temperature
In Freetown, the average seawater temperature in September is 27.6°C (81.7°F).Note: For water activities like swimming, diving, and more, temperatures ranging between 25°C (77°F) and 29°C (84.2°F) offer superior comfort and enjoyment for lengthy durations.
Daylight
The average length of the day in September in Freetown is 12h and 10min.On the first day of the month, sunrise is at 06:44 and sunset at 19:01. On the last day of September, sunrise is at 06:41 and sunset at 18:44 GMT.
Sunshine
In Freetown, the average sunshine in September is 6.7h.UV index
January through June, September through December, with an average maximum UV index of 7, are months with the highest UV index in Freetown, Sierra Leone. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 7 during September leads to these advisories:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Freetown, Sierra Leone
- Average high temperature in September: 28.1°C
The warmest month (with the highest average high temperature) is January (31.4°C).
The month with the lowest average high temperature is August (27.3°C).
- Average low temperature in September: 24.4°C
The month with the highest average low temperature is May (26.2°C).
The coldest month (with the lowest average low temperature) is August (23.9°C).
Average pressure in September
Freetown, Sierra Leone
- Average pressure in September: 1012.8mbar
The month with the highest atmospheric pressure is July (1013.8mbar).
The months with the lowest atmospheric pressure are February and March (1010.4mbar).
Average wind speed in September
Freetown, Sierra Leone
- Average wind speed in September: 9.5km/h
The windiest month (with the highest average wind speed) is August (12km/h).
The calmest month (with the lowest average wind speed) is November (6.8km/h).
Average humidity in September
Freetown, Sierra Leone
- Average humidity in September: 85%
The month with the highest relative humidity is August (86%).
The month with the lowest relative humidity is January (68%).
Average rainfall in September
Freetown, Sierra Leone
- Average rainfall in September: 220mm
The wettest month (with the highest rainfall) is August (391mm).
The driest month (with the least rainfall) is February (1mm).
Average rainfall days in September
Freetown, Sierra Leone
- Average rainfall days in September: 28.6 days
The month with the highest number of rainy days is July (30.3 days).
The month with the least rainy days is February (0.8 days).
Average sea temperature in September
Freetown, Sierra Leone
- Average sea temperature in September: 27.6°C
The best months for swimming (with the highest average sea temperature) are November and December (28.8°C).
The coldest month (with the lowest average sea temperature) is August (27.3°C).
Average daylight in September /
Average sunshine in September
Freetown, 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: 6h and 42min
The month with the most sunshine is February (Average sunshine: 9h and 54min).
The month with the least sunshine is August (Average sunshine: 4h and 48min).
Average sunshine days in September
Freetown, Sierra Leone
- Average sunshine days in September: 0.8 days
The month with the most sunshine days is January (29 days).
The month with the least sunshine days is August (0.5 days).
Average UV index in September
Freetown, 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
Freetown, Sierra Leone
- Average cloud cover in September: 55
The month with the most cloud cover is August (Cloud cover 67).
The month with the least cloud cover is February (Cloud cover 11).
Average visibility in September
Freetown, Sierra Leone
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, October, November and December (10km).
The months with the lowest visibility are July, August and September (9km).
