September weather forecast
Ilondé, Guinea-Bissau

The first month of the autumn, September, is a hot month in Ilondé, Guinea-Bissau, with an average temperature fluctuating between 30.5°C (86.9°F) and 25°C (77°F).

Temperature

The advent of September brings an average high-temperature of a tropical 30.5°C (86.9°F), exhibiting minor difference from the previous month. Ilondé experiences a steady low-temperature of 25°C (77°F) throughout September.

Heat index

The heat index for September is appraised at a blistering 40°C (104°F). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', determines the feeling of heat when you account for the relative humidity. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September in Ilondé, Guinea-Bissau, is 81%.

Rainfall

In Ilondé, in September, during 20.7 rainfall days, 132mm (5.2") of precipitation is typically accumulated. In Ilondé, during the entire year, the rain falls for 107.5 days and collects up to 726mm (28.58") of precipitation.

Daylight

The average length of the day in September in Ilondé is 12h and 11min.
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 06:51 and sunset at 18:53 GMT.

Sunshine

In September, the average sunshine in Ilondé, Guinea-Bissau, is 7.5h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Ilondé. The months with the lowest UV index in Ilondé, Guinea-Bissau, are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.