September weather forecast
Altos, Brazil

September, the first month of the spring in Altos, is still a very hot month, with temperature in the range of an average high of 36.6°C (97.9°F) and an average low of 23.5°C (74.3°F).

Temperature

September is the month when Altos experiences its warmest temperatures, averaging a high of 36.6°C (97.9°F) and a low of 23.5°C (74.3°F).

Heat index

The average heat index in September is appraised at a blisteringly hot 43°C (109.4°F). Note: Heat exhaustion and heat cramps are probable. Heatstroke can follow with prolonged activity.
Be advised, the heat index considers values for conditions in shade and with a light breeze. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Perspiration, followed by sweat evaporation, is the human body's chief method to maintain a balanced temperature. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

September is the least humid month in Altos, Brazil, with an average relative humidity of 46%.

Rainfall

September is the month with the least rainfall in Altos. Rain falls for 7.1 days and accumulates 10mm (0.39") of precipitation.

Daylight

The average length of the day in September is 12h and 5min.
On the first day of the month, sunrise is at 05:49 and sunset at 17:50. On the last day of September, sunrise is at 05:35 and sunset at 17:44 -03.

Sunshine

September has the most sunshine of the year, with an average of 9.6h of sunshine.

UV index

The month with the highest UV index in Altos, Brazil, is September, with an average maximum UV index of 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 8 in September translates into the following instructions:
Without proper safety measures, skin and eyes can be quickly harmed. Be sure to protect yourself. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.