September weather forecast
Alcântara, Brazil

September, the first month of the spring in Alcântara, is still a tropical month, with an average temperature varying between 25.3°C (77.5°F) and 30.6°C (87.1°F).

Temperature

The advent of September brings an average high-temperature of a still hot 30.6°C (87.1°F), almost identical to the preceding month. During September, Alcântara sees a mean low-temperature of 25.3°C (77.5°F).

Heat index

The heat index value for September is estimated at a fiery hot 38°C (100.4°F). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The months with the lowest humidity are September through November, with an average relative humidity of 75%.

Rainfall

In Alcântara, in September, during 14.1 rainfall days, 33mm (1.3") of precipitation is typically accumulated. In Alcântara, during the entire year, the rain falls for 291.1 days and collects up to 2596mm (102.2") of precipitation.

Sea temperature

September is the month with the coldest seawater in Alcântara, with an average sea temperature of 27.4°C (81.3°F).
Note: For swimming, diving, or other water activities, the temperature range of 25°C (77°F) to 29°C (84.2°F) is perceived as exceptionally enjoyable and comfortable even for prolonged periods.

Daylight

The average length of the day in September in Alcântara is 12h and 6min.
On the first day of September, sunrise is at 05:55 and sunset at 17:59. On the last day of the month, sunrise is at 05:43 and sunset at 17:51 -03.

Sunshine

In September, the average sunshine in Alcântara is 8.1h.

UV index

April, June through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Shield from overexposure. Defense against sun-related harm is required. 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. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Take caution! The UV rays from the Sun gain strength from sand and water reflections.