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

September's weather displays an average high-temperature of a tropical 30.9°C (87.6°F), slightly varied from August's 29.9°C (85.8°F). Throughout September, the temperature in Catió falls to an average low of 23.6°C (74.5°F).

Heat index

For September, the heat index is estimated at a blistering 42°C (107.6°F). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.
One should consider that heat index numbers are for shaded settings and light wind. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. 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 exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

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

Rainfall

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

Daylight

In Catió, the average length of the day in September is 12h and 11min.
On the first day of September, sunrise is at 06:50 and sunset at 19:10. On the last day of the month, sunrise is at 06:49 and sunset at 18:51 GMT.

Sunshine

The average sunshine in September is 6.4h.

UV index

January through July, September through December, with an average maximum UV index of 7, are months with the highest UV index in Catió. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.