September weather forecast
Ondame, Guinea-Bissau

As September dawns upon Ondame, Guinea-Bissau, a gradual recession of the wet season is discernible. This month marks the beginning of a retreat from the rain-ridden months, showcasing a slight reduction in rainfall leading to a reboot of the dry cycle. Chilly intervals arrive, with minimum temperatures dropping to 25°C (77°F) amidst heat surges to 30.5°C (86.9°F). The city enjoys an extension of daylight hours in comparison to the previous month, providing residents with a respite from the extensive indoor period. The winds also start losing their earlier intensity, paving the way back towards a dryer and calmer weather period.

Temperature

Ondame observes an average high-temperature of a hot 30.5°C (86.9°F) in September, barely different from 29.6°C (85.3°F) in August. Throughout September, Ondame registers a consistent average low-temperature of 25°C (77°F).

Heat index

Throughout September, the heat index is appraised at a blisteringly hot 40°C (104°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. 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 the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In September, the average relative humidity in Ondame is 81%.

Rainfall

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

Daylight

In Ondame, the average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 06:53 and sunset at 19:13. On the last day of September, sunrise is at 06:52 and sunset at 18:54 GMT.

Sunshine

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

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index 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 rays for the ordinary person.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.