September weather forecast
Caiar, Guinea-Bissau

The first month of the autumn, September, is a hot month in Caiar, Guinea-Bissau, with temperature in the range of an average low of 23.6°C (74.5°F) and an average high of 30.9°C (87.6°F).

Temperature

The advent of September brings an average high-temperature of a tropical 30.9°C (87.6°F), almost identical to the preceding month. Caiar's average low-temperature for the month of September records at a warm 23.6°C (74.5°F).

Heat index

For September, the heat index is appraised at a blistering 42°C (107.6°F). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an estimation of the warmth sensation when considering humidity levels. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. 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. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

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

Rainfall

In Caiar, in September, it is raining for 22.2 days, with typically 168mm (6.61") of accumulated precipitation. In Caiar, during the entire year, the rain falls for 109.7 days and collects up to 868mm (34.17") of precipitation.

Daylight

In Caiar, the average length of the day in September is 12h and 11min.
On the first day of September in Caiar, Guinea-Bissau, 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 September, the average sunshine in Caiar 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 Caiar. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.