September weather forecast
Goiânia, Brazil

In September, Goiânia witnesses a shift in weather conditions. Even as the temperatures remain above 30°C (86°F), rainfall returns to the city with a noticeable 45mm (1.77") over 5 days. September also marks the end of the year's longest sunshine hours as they fall to 7.1 hours. As the daylight remains constant at 12 hours, relative humidity levels start to rise. Transitioning into October, anticipate an increase in rain coupled with a decrease in temperature and sunshine hours.

Temperature

In Goiânia, the month of September registers the highest temperatures, averaging 31.9°C (89.4°F) at the peak and 18.1°C (64.6°F) at the lowest.

Heat index

Throughout September, the heat index is computed to be a very hot 35°C (95°F). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', gives an indication of how one might feel in terms of heat after considering humidity. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

The average relative humidity in September is 53%.

Rainfall

In September, the rain falls for 5 days. Throughout September, 45mm (1.77") of precipitation is accumulated. Throughout the year, there are 116 rainfall days, and 1571mm (61.85") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 1min.
On the first day of September, sunrise is at 06:22 and sunset at 18:10. On the last day of the month, sunrise is at 05:59 and sunset at 18:14 -03.

Sunshine

In Goiânia, the average sunshine in September is 7.1h.