September weather forecast
João Pessoa, Brazil

In September, João Pessoa experiences a significant decrease in rainfall, settling at 87mm (3.43"), marking the retreat of Monsoons. There's a slight increase in temperatures, and the sea temperature remains stable, signalling the beginning of the warmer season. As a result of these changes, the city sees a gradual increase in daylight hours while maintaining comfortable humidity levels.

Temperature

The high-temperature average in September for João Pessoa is a still warm 28.3°C (82.9°F), staying closely aligned with August's conditions. Throughout September, the average low-temperature records at an agreeable 21.5°C (70.7°F).

Heat index

Throughout September, the heat index is evaluated at a tropical 32°C (89.6°F). Persistently participating in activities during exposure may lead to fatigue and induce heat cramps.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', evaluates the perceived heat by adding the effect of moisture in the air. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.

Humidity

The average relative humidity in September in João Pessoa is 77%.

Rainfall

In João Pessoa, in September, during 11 rainfall days, 87mm (3.43") of precipitation is typically accumulated. In João Pessoa, during the entire year, the rain falls for 149 days and collects up to 2145mm (84.45") of precipitation.

Sea temperature

August and September, with an average sea temperature of 26.6°C (79.9°F), are months with the coldest seawater in João Pessoa.
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are considered superb and highly pleasant for water activities over extended periods.

Daylight

The average length of the day in September is 12h and 4min.
On the first day of the month, sunrise is at 05:19 and sunset at 17:18. On the last day of September, sunrise is at 05:04 and sunset at 17:14 -03.

Sunshine

In João Pessoa, the average sunshine in September is 7.8h.