September weather forecast
Porto Franco, Brazil

The first month of the spring, September, is also a sweltering month in Porto Franco, Brazil, with temperature in the range of an average low of 23.1°C (73.6°F) and an average high of 36.5°C (97.7°F).

Temperature

Temperature readings reach their annual highs in September, averaging 36.5°C (97.7°F) and a minimum average of 23.1°C (73.6°F).

Heat index

For most parts of September, the heat index is computed to be a scorching 43°C (109.4°F). Mind: Heat cramps along with heat exhaustion are anticipated. Heatstroke can develop with continued physical activity.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
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. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

August and September, with an average relative humidity of 46%, are the least humid months.

Rainfall

In Porto Franco, during September, the rain falls for 6 days and regularly aggregates up to 9mm (0.35") of precipitation. Throughout the year, in Porto Franco, there are 208.8 rainfall days, and 1007mm (39.65") of precipitation is accumulated.

Daylight

The average length of the day in September in Porto Franco is 12h and 4min.
On the first day of September in Porto Franco, sunrise is at 06:09 and sunset at 18:09. On the last day of the month, sunrise is at 05:54 and sunset at 18:04 -03.

Sunshine

In Porto Franco, the average sunshine in September is 10.3h.

UV index

The months with the highest UV index in Porto Franco are March, May, July through October and December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index, 7 in September, converts into the following recommendations:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.