September weather forecast
Rio Uaçá, Brazil

The first month of the autumn, September, is also a hot month in Rio Uaçá, Brazil, with temperature in the range of an average low of 22°C (71.6°F) and an average high of 33.6°C (92.5°F).

Temperature

Rio Uaçá experiences an average high-temperature of a still tropical 33.6°C (92.5°F) in September, subtly different from August's 32.3°C (90.1°F). During September, Rio Uaçá consistently records a temperature low averaging a pleasant 22°C (71.6°F).

Heat index

During September, the heat index is estimated at a life-threatening hot 48°C (118.4°F). Forewarned: Heat cramps and heat exhaustion are anticipated. Ongoing physical activity increases the likelihood of heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The average relative humidity in September in Rio Uaçá is 76%.

Rainfall

In Rio Uaçá, in September, during 11.8 rainfall days, 21mm (0.83") of precipitation is typically accumulated. In Rio Uaçá, during the entire year, the rain falls for 280.4 days and collects up to 1281mm (50.43") of precipitation.

Daylight

In Rio Uaçá, the average length of the day in September is 12h and 8min.
On the first day of the month, sunrise is at 06:19 and sunset at 18:30. On the last day of September, sunrise is at 06:12 and sunset at 18:17 -03.

Sunshine

With an average of 8.8h of sunshine, September has the most sunshine of the year in Rio Uaçá.

UV index

The months with the highest UV index in Rio Uaçá are July through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Enhance your sun protection with tightly woven, yet airy clothing.