September weather forecast
Macapá, Brazil

As Macapá moves into September, there is an extension of the dry spell from August. As nominal rainfall occurs, temperatures start to rise gradually, making the days warmer. The sunny days, coupled with a slight breeze aid in creating a comfortable atmosphere. Endurance of the sea's warm temperature makes it an excellent month for water activities.

Temperature

In September, Macapá experiences a minor shift in meteorological conditions with average high-temperatures marked at a still tropical 31.9°C (89.4°F), closely mirroring the climate in August. An average low-temperature of 25.3°C (77.5°F) is observed in Macapá during the September nights.

Heat index

The heat index value for September is evaluated at a blistering 42°C (107.6°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'real feel' or 'felt air temperature', reflects the feeling of heat when considering both air temperature and humidity. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In Macapá, the average relative humidity in September is 74%.

Rainfall

The month with the least rainfall is September, when the rain falls for 13.1 days and typically collects 39mm (1.54") of precipitation.

Sea temperature

In September, the average sea temperature in Macapá, Brazil, is 27.9°C (82.2°F).
Note: Swimming, diving, and similar water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as very agreeable and pleasurable for lengthy periods without discomfort.

Daylight

The months with the shortest days in Macapá, Brazil, are March and September, with an average of 12h and 6min of daylight.
On the first day of September, sunrise is at 06:20 and sunset at 18:27. On the last day of the month, sunrise is at 06:10 and sunset at 18:17 -03.

Sunshine

The average sunshine in September in Macapá, Brazil, is 8.9h.

UV index

The months with the highest UV index are May through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum daily UV index of 7 during September morphs into the following directions:
Ward off overexposure. Defence against solar harm is crucial. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.