September weather forecast
Catió, Guinea-Bissau

The heavy rainfall begins to recede in September in Catió, signalling an approaching end to the wet season. The climate transitions from being overwhelmingly humid to a pleasantly moderate atmosphere. The frequency of rainfall scales back, leading to an upswing in sunlight hours as days roll on. A return of more dry days also signifies the forthcoming warm weather. The average pressure levels subtly fluctuate, aiding in the moderation of climatic conditions.

Temperature

The transition from August to September brings an average high-temperature of a tropical 30.9°C (87.6°F), barely different from August's 29.9°C (85.8°F). In the month of September, the nighttime temperature dips to a steady average of 23.6°C (74.5°F).

Heat index

For September, the heat index is estimated at a scorching 42°C (107.6°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

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

Rainfall

In Catió, Guinea-Bissau, during September, the rain falls for 22.2 days and regularly aggregates up to 168mm (6.61") of precipitation. Throughout the year, there are 109.7 rainfall days, and 868mm (34.17") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 06:50 and sunset at 19:10. On the last day of September, sunrise is at 06:49 and sunset at 18:51 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 exposure to the Sun's UV rays for the ordinary person.
Note: In September, an average UV index of 7 transforms into the following instructions:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.