September weather forecastVilhena, Brazil

Weather in September

The first month of the spring, September, is still a hot month in Vilhena, Brazil, with an average temperature fluctuating between 20.8°C (69.4°F) and 34.1°C (93.4°F).

Temperature

Vilhena's warmest temperatures are experienced in September, with average high temperatures of 34.1°C (93.4°F) and lows of 20.8°C (69.4°F).

Heat index

The heat index value during September is evaluated at a blistering 40°C (104°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Excessive relative humidity disturbs the body's typical cooling process by reducing evaporation, leading to a decrease in body cooling rate and an increase in the sensation of warmth. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In Vilhena, the average relative humidity in September is 55%.

Rainfall

In Vilhena, during September, the rain falls for 12.7 days and regularly aggregates up to 34mm (1.34") of precipitation. Throughout the year, there are 237.8 rainfall days, and 1557mm (61.3") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 2min.
On the first day of September, sunrise is at 06:04 and sunset at 17:56. On the last day of the month, sunrise is at 05:43 and sunset at 17:56 -04.

Sunshine

The months with the most sunshine in Vilhena are September and October, with an average of 8.6h of sunshine.

UV index

The months with the highest UV index in Vilhena are August and September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 7 during September translates into these guidelines:
Deflect overexposure. Sun protection is a necessity. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.