September weather forecast
Sancoma, Guinea-Bissau

The first month of the autumn, September, is still a tropical month in Sancoma, Guinea-Bissau, with an average temperature varying between 23.2°C (73.8°F) and 31.6°C (88.9°F).

Temperature

Sancoma notes an average high-temperature of a still hot 31.6°C (88.9°F) in September, displaying minor variation from August. Sancoma reports an average nighttime low-temperature of 23.2°C (73.8°F) in September.

Heat index

September's mean heat index is appraised at a blazing hot 45°C (113°F). Attention: Heat exhaustion and heat cramps are quite likely. Heatstroke becomes a risk with continued exertion.
Heat index details are generally centered around shaded locations and a mild breeze. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In Sancoma, the average relative humidity in September is 84%.

Rainfall

In September, the rain falls for 23.7 days. Throughout September, 152mm (5.98") of precipitation is accumulated. In Sancoma, during the entire year, the rain falls for 109.1 days and collects up to 654mm (25.75") of precipitation.

Daylight

The average length of the day in September is 12h and 12min.
On the first day of the month, sunrise is at 06:52 and sunset at 19:13. On the last day of September, sunrise is at 06:52 and sunset at 18:53 GMT.

Sunshine

In September, the average sunshine is 7h.

UV index

In Sancoma, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the UV index of 7 transforms into the following advice:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.