September weather forecast
Boe, Guinea-Bissau

The arrival of September signals a noticeable decline in rainfall, reducing to 168mm (6.61"), signifying the gradual retreat of the wet season. Despite the reduced rainfall, high humidity levels persist at 85%. Temperature readings exhibit mild fluctuations, with the maximum temperature rising to 30.9°C (87.6°F) while the minimum temperature subtly decreases to 23.6°C (74.5°F). Consequently, the city sees a slight increase in sunshine hours, yet it remains far from matching the averages viewed at the start of the year.

Temperature

The transition into September reveals an average high-temperature of a tropical 30.9°C (87.6°F), mirroring a close resemblance to August. September witnesses an average nighttime temperature of 23.6°C (74.5°F).

Heat index

September's heat index is evaluated at a blistering 42°C (107.6°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

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

Rainfall

In Boe, in September, during 22.2 rainfall days, 168mm (6.61") of precipitation is typically accumulated. In Boe, during the entire year, the rain falls for 109.7 days and collects up to 868mm (34.17") of precipitation.

Daylight

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

Sunshine

In September, the average sunshine 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 of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 7 in September, converts into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Employ a wide-brim hat for potent defense against up to 50% of UV rays.