September weather forecast
Graça, Brazil

The first month of the spring, September, is still a tropical month in Graça, Brazil, with temperature in the range of an average high of 33.9°C (93°F) and an average low of 20.7°C (69.3°F).

Temperature

Graça marks the arrival of September with an average high-temperature of a still tropical 33.9°C (93°F), hardly different from August's 32.9°C (91.2°F). In September, the temperature registers a significant dip to an average of 20.7°C (69.3°F) at night.

Heat index

During September, the heat index is estimated at a scorching 40°C (104°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Heat index determinations are made taking into account the shade and light air movements. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

September is the least humid month, with an average relative humidity of 56%.

Rainfall

September is the month with the least rainfall. Rain falls for 4.4 days and accumulates 4mm (0.16") of precipitation.

Daylight

In Graça, the average length of the day in September is 12h and 5min.
On the first day of September in Graça, sunrise is at 05:41 and sunset at 17:43. On the last day of the month, sunrise is at 05:28 and sunset at 17:37 -03.

Sunshine

With an average of 9.5h of sunshine, September has the most sunshine of the year.

UV index

July through December, with an average maximum UV index of 7, are months with the highest UV index in Graça. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 7 in September transforms into this advice:
Shield from overexposure. Defense against sun-related harm is required. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.