Why is the air temperature highest in the late afternoon on a sunny day?

The warmer the air, the greater its capacity for water vapor. Thus, the relative humidity increases as the temperature falls toward the dew point and decreases as it rises. The relative humidity is usually highest around sunrise when the overnight low temperature is frequently close to the dew point. The humidity drops during the day as the temperature rises and usually reaches its lowest value in the middle or late afternoon when the day's maximum temperature is recorded.

Explanation:

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