September weather forecast
Bolama, Guinea-Bissau

September ushers in an easing of rain with a drop down to 132mm (5.2"). During this period, Bolama begins to transition from the wet period back to the dry season. With less cloud coverage than the previous months, daylight hours begin to increase again. Sunshine takes a front seat again, relieving the city from heavy clouds and constant downpours. The weather during this month allows visitors to begin exploring outdoor activities as the rains recede, marking the beginning of the drier months ahead.

Temperature

In the transition from August to September, Bolama reports an average high-temperature of a hot 30.5°C (86.9°F), indicating a close resemblance to the prior month. Throughout September, an average low-temperature of 25°C (77°F) is expected.

Heat index

September's heat index is evaluated at an extremely hot 40°C (104°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in September is 81%.

Rainfall

In September, the rain falls for 20.7 days. Throughout September, 132mm (5.2") of precipitation is accumulated. In Bolama, Guinea-Bissau, during the entire year, the rain falls for 107.5 days and collects up to 726mm (28.58") of precipitation.

Sea temperature

In September, the average sea temperature in Bolama is 27.8°C (82°F).
Note: For swimming, diving, or other water activities, temperatures from 25°C (77°F) to 29°C (84.2°F) provide the most enjoyable experience for extended periods without discomfort.

Daylight

The average length of the day in September in Bolama is 12h and 11min.
On the first day of September, sunrise is at 06:51 and sunset at 19:11. On the last day of the month, sunrise is at 06:50 and sunset at 18:52 GMT.

Sunshine

In Bolama, the average sunshine in September is 7.5h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Bolama. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Warning! Sand and water reflections boost the intensity of UV exposure.