September weather forecast
Chumael, Guinea-Bissau

The first month of the autumn, September, is a tropical month in Chumael, Guinea-Bissau, with an average temperature fluctuating between 23.6°C (74.5°F) and 30.9°C (87.6°F).

Temperature

September's commencement is accompanied by an average high-temperature of a hot 30.9°C (87.6°F), diverging marginally from August's 29.9°C (85.8°F). Nighttime temperatures in September average to a warm 23.6°C (74.5°F).

Heat index

For September, the heat index is computed to be a blistering 42°C (107.6°F). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Heat index values are typically calculated for conditions of shade and a light breeze. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The months with the highest humidity in Chumael are August and September, with an average relative humidity of 85%.

Rainfall

In Chumael, in September, during 22.2 rainfall days, 168mm (6.61") of precipitation is typically accumulated. Throughout the year, there are 109.7 rainfall days, and 868mm (34.17") of precipitation is accumulated.

Daylight

In Chumael, the average length of the day in September is 12h and 11min.
On the first day of September in Chumael, sunrise is at 06:48 and sunset at 19:08. On the last day of the month, sunrise is at 06:47 and sunset at 18:49 GMT.

Sunshine

The average sunshine in September is 6.4h.

UV index

The months with the highest UV index are January through July, September through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: An average UV index of 7 in September transforms into this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.