September weather forecast
Cacoal, Brazil

The first month of the spring, September, is still a very hot month in Cacoal, Brazil, with an average temperature varying between 23.8°C (74.8°F) and 37.1°C (98.8°F).

Temperature

September brings the highest temperatures, with an average high of 37.1°C (98.8°F) and an average low of 23.8°C (74.8°F).

Heat index

For September, the heat index is computed to be a life-threatening hot 46°C (114.8°F). Stay vigilant: Heat cramps along with heat exhaustion are expected. Heatstroke may follow prolonged exertion.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In Cacoal, the average relative humidity in September is 49%.

Rainfall

In Cacoal, Brazil, in September, during 12.3 rainfall days, 23mm (0.91") of precipitation is typically accumulated. In Cacoal, during the entire year, the rain falls for 235.6 days and collects up to 1420mm (55.91") of precipitation.

Daylight

In Cacoal, Brazil, the average length of the day in September is 12h and 2min.
On the first day of September in Cacoal, sunrise is at 06:08 and sunset at 18:02. On the last day of the month, sunrise is at 05:49 and sunset at 18:01 -04.

Sunshine

The average sunshine in September in Cacoal is 10.3h.

UV index

In September, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 during September translates into the following directions:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.