September weather forecast
Colares, Brazil

September, the first month of the spring in Colares, is also a hot month, with an average temperature ranging between max 31.1°C (88°F) and min 24.5°C (76.1°F).

Temperature

September's onset records a minor alteration in the average high-temperature to a still hot 31.1°C (88°F) from August's 31°C (87.8°F). In Colares, the nighttime temperature averages to a moderately hot 24.5°C (76.1°F) during September.

Heat index

For September, the heat index is calculated to be a blisteringly hot 41°C (105.8°F). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. 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 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In Colares, the average relative humidity in September is 78%.

Rainfall

In September, the rain falls for 20.4 days. Throughout September, 51mm (2.01") of precipitation is accumulated. In Colares, during the entire year, the rain falls for 315.6 days and collects up to 2313mm (91.06") of precipitation.

Daylight

In September, the average length of the day is 12h and 7min.
On the first day of September in Colares, sunrise is at 06:10 and sunset at 18:15. On the last day of the month, sunrise is at 05:59 and sunset at 18:06 -03.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The months with the highest UV index are January, June through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 7 during September translates into the following guidance:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. 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. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.