September weather forecastDesterro, Brazil

Weather in September

September, the first month of the spring in Desterro, is still a hot month, with an average temperature varying between 32.8°C (91°F) and 20.3°C (68.5°F).

Temperature

September's beginning signals an average high-temperature of a still tropical 32.8°C (91°F), barely different from August's 31.7°C (89.1°F). The nighttime temperature in Desterro shows a significant divergence from the daytime highs, averaging at an agreeable 20.3°C (68.5°F) in September.

Heat index

In September, the heat index is estimated at a fiery hot 38°C (100.4°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. 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 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

In September, the average relative humidity in Desterro is 56%.

Rainfall

August and September are months with the least rain in Desterro when the rain falls for 1.2 days and typically aggregates up to 1mm (0.04") of rain.

Daylight

In September, the average length of the day in Desterro is 12h and 4min.
On the first day of the month, sunrise is at 05:28 and sunset at 17:27. On the last day of September, sunrise is at 05:13 and sunset at 17:23 -03.

Sunshine

September has the most sunshine of the year, with an average of 9.9h of sunshine.

UV index

The months with the highest UV index in Desterro are January through March, August through December, 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 average individuals.
Note: A maximum high UV index of 7 in September translates into the following recommendations:
Deflect overexposure. Sun protection is a necessity. 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.