September weather forecast
Rianápolis, Brazil

The first month of the spring, September, is still a tropical month in Rianápolis, Brazil, with temperature in the range of an average high of 33.5°C (92.3°F) and an average low of 20.4°C (68.7°F).

Temperature

Rianápolis's warmest month, September, generally records average temperatures ranging from a high of 33.5°C (92.3°F) to a low of 20.4°C (68.7°F).

Heat index

The heat index value during September is appraised at a very hot 35°C (95°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'feels like' or 'real feel', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

The least humid month is September, with an average relative humidity of 40%.

Rainfall

In September, the rain falls for 7.9 days. Throughout September, 16mm (0.63") of precipitation is accumulated. In Rianápolis, during the entire year, the rain falls for 219.6 days and collects up to 1537mm (60.51") of precipitation.

Daylight

The average length of the day in September is 12h and 1min.
On the first day of September in Rianápolis, Brazil, sunrise is at 06:23 and sunset at 18:12. On the last day of the month, sunrise is at 06:00 and sunset at 18:14 -03.

Sunshine

In Rianápolis, the average sunshine in September is 9.7h.

UV index

The months with the highest UV index in Rianápolis, Brazil, are August and September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: The UV index of 7 during September leads to these advisories:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.