Porto Nacional's climate is warm and humid year-round, with temperatures gradually increasing from April to September before slowly decreasing again. The hottest months are typically between October and September, with August being the peak month with an average high of 40°C. During this period, temperature fluctuations are significant, ranging from lows in the mid-teens to highs above 37°C. In contrast, the cooler months from May to July see temperatures dip into the mid-to-low teens at night but still remain warm during the day, averaging around 27-29°C. Overall, Porto Nacional's climate is characterized by high temperatures and humidity levels throughout the year.