Why is the temperature difference between day and night large in Rio de Janeiro, Brazil?

Due to the strong local solar radiation during the day, the temperature difference between day and night is large.

According to statistics, the highest temperature in August in Rio is the fourth from the bottom of all months in the year, and the lowest temperature is the third from the bottom. However, the winter here is still very warm. The average temperature in Rio in August is 21.8℃, the average maximum temperature is 25.5℃, and the historical extreme maximum temperature has reached 38.9℃; the average minimum temperature is 18.9℃, and the extreme minimum is 10.6℃. , no matter how cold it is, it can't reach the 10℃ mark. It can only be described as cool. According to statistics, there has been no cold weather such as frost, rain, or snow in Rio in August. However, due to the strong local solar radiation during the day, the temperature drops relatively quickly after the sun sets at night, and the temperature difference between day and night is obvious.