September weather forecastMandem, Guinea-Bissau
September
Weather in September
The first month of the autumn, September, is also a hot month in Mandem, Guinea-Bissau, with temperature in the range of an average high of 31.7°C (89.1°F) and an average low of 23°C (73.4°F).Temperature
An average high-temperature of a still hot 31.7°C (89.1°F) marks September, exhibiting a close resemblance to the conditions in August. During September nights, Mandem records an average temperature of 23°C (73.4°F).Heat index
The heat index for September is appraised at a blazing hot 45°C (113°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.Heat index's context suggests values are appropriate for shady areas and slight breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.
Humidity
The average relative humidity in September is 85%.Rainfall
In Mandem, Guinea-Bissau, during September, the rain falls for 23.9 days and regularly aggregates up to 145mm (5.71") of precipitation. Throughout the year, in Mandem, Guinea-Bissau, there are 107.6 rainfall days, and 593mm (23.35") of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 11min.On the first day of the month, sunrise is at 06:48 and sunset at 19:09. On the last day of September, in Mandem, sunrise is at 06:48 and sunset at 18:49 GMT.
Sunshine
In September, the average sunshine in Mandem is 7.2h.UV index
In Mandem, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 7 during September leads to these advisories:
Resist overexposure. Safeguarding from solar damage is indispensable. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mandem, Guinea-Bissau
- Average high temperature in September: 31.7°C
The warmest month (with the highest average high temperature) is April (42.1°C).
The month with the lowest average high temperature is August (31°C).
- Average low temperature in September: 23°C
The month with the highest average low temperature is June (25.1°C).
The coldest month (with the lowest average low temperature) is January (19.3°C).
Average pressure in September
Mandem, Guinea-Bissau
- Average pressure in September: 1012.1mbar
The month with the highest atmospheric pressure is July (1012.6mbar).
The month with the lowest atmospheric pressure is April (1009.5mbar).
Average wind speed in September
Mandem, Guinea-Bissau
- Average wind speed in September: 6.2km/h
The windiest month (with the highest average wind speed) is February (9.4km/h).
The calmest month (with the lowest average wind speed) is October (6km/h).
Average humidity in September
Mandem, Guinea-Bissau
- Average humidity in September: 85%
The month with the highest relative humidity is August (86%).
The month with the lowest relative humidity is January (19%).
Average rainfall in September
Mandem, Guinea-Bissau
- Average rainfall in September: 145mm
The wettest month (with the highest rainfall) is August (206mm).
The driest months (with the least rainfall) are January, February, March and December (0mm).
Average rainfall days in September
Mandem, Guinea-Bissau
- Average rainfall days in September: 23.9 days
The month with the highest number of rainy days is August (27.7 days).
The month with the least rainy days is January (0.1 days).
Average daylight in September /
Average sunshine in September
Mandem, Guinea-Bissau
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 12h and 48min).
The month with the shortest days is December (Average daylight: 11h and 24min).
- Average sunshine in September: 7h and 12min
The month with the most sunshine is April (Average sunshine: 10h and 0min).
The month with the least sunshine is August (Average sunshine: 5h and 54min).
Average sunshine days in September
Mandem, Guinea-Bissau
- Average sunshine days in September: 3.8 days
The month with the most sunshine days is January (30.9 days).
The month with the least sunshine days is August (2.5 days).
Average UV index in September
Mandem, Guinea-Bissau
- Average UV index in September: 7
The months with the highest UV index are March, April and May (UV index 8).
The month with the lowest UV index is August (UV index 6).
Average cloud cover in September
Mandem, Guinea-Bissau
- Average cloud cover in September: 54
The month with the most cloud cover is August (Cloud cover 63).
The month with the least cloud cover is March (Cloud cover 6).
Average visibility in September
Mandem, Guinea-Bissau
- Average visibility in September: 7km
The months with the highest visibility are January, February, March, April, May, June, November and December (10km).
The months with the lowest visibility are August and September (7km).
