September weather forecast
Oiapoque, Brazil

September, the first month of the autumn in Oiapoque, is still a hot month, with an average temperature fluctuating between 21.8°C (71.2°F) and 33.7°C (92.7°F).

Temperature

Oiapoque in September witnesses an average high-temperature of a still tropical 33.7°C (92.7°F), indicating a slight variation from August's 32.3°C (90.1°F). Throughout September, the temperature tends to fall to a consistent average low of 21.8°C (71.2°F).

Heat index

The heat index value during September is evaluated at a life-threatening hot 49°C (120.2°F). Stay wary: Heat exhaustion and heat cramps are possible. Heatstroke can ensue from extended effort.
The metrics for the heat index are tailored for both shady environments and light winds. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In September, the average relative humidity in Oiapoque is 76%.

Rainfall

September is the month with the least rainfall in Oiapoque. Rain falls for 12.5 days and accumulates 21mm (0.83") of precipitation.

Daylight

In Oiapoque, the average length of the day in September is 12h and 8min.
On the first day of the month, sunrise is at 06:21 and sunset at 18:32. On the last day of September, sunrise is at 06:14 and sunset at 18:19 -03.

Sunshine

With an average of 8.8h of sunshine, September has the most sunshine of the year in Oiapoque.

UV index

August through October, with an average maximum UV index of 7, are months with the highest UV index in Oiapoque. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.