September weather forecast
Coaina, Guinea-Bissau

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

Temperature

Entering September, Coaina's average high-temperature reads a hot 30.9°C (87.6°F), indicating a close resemblance to the previous month's climate. September nights cool down to an average low-temperature of 23.6°C (74.5°F).

Heat index

September's mean heat index is computed to be a blisteringly hot 42°C (107.6°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', shows a temperature sensation when both heat and moisture conditions are combined. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. Increased relative humidity interferes with body cooling by slowing the rate of evaporation, resulting in a slower body cooling rate and a heightened feeling of heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

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

Rainfall

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

Daylight

In September, the average length of the day is 12h and 11min.
On the first day of September, sunrise is at 06:46 and sunset at 19:07. On the last day of the month, sunrise is at 06:45 and sunset at 18:47 GMT.

Sunshine

In September, the average sunshine is 6.4h.

UV index

January through July, September through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 7 in September translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.