September weather forecast
Mandem, Guinea-Bissau

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.