Why is the temperature the highest at three or four o'clock every afternoon?

In addition to direct sunlight, high temperature is often related to geothermal energy.

Generally speaking, the process of temperature rise is that solar radiation warms the ground, and the ground radiates energy after getting heat, and most of this heat is absorbed by the atmosphere. In this way, the temperature of the atmosphere will rise and the temperature will become higher.

It's usually noon 12 here, and the direct sunlight is the strongest. At this time, the ground gets more heat, but at this time, the ground gets more solar energy than the ground loses. At about 1 in the afternoon, the solar heat gained by the ground is equal to the heat lost by the ground, and the ground temperature reaches the highest value. It takes about 1 hour for the ground to transfer this heat to the atmosphere, so it is at 2 pm.

It should be the same process in your place, except that the time of direct sunlight may be a little later than 12, so the highest temperature will appear at three or four in the afternoon.