According to the National Satellite and Information Service, the hottest time of the day is generally around midafternoon. The exact time of the day that it is the hottest depends on where a person lives and what time of the year it is.
Many believe that noon is the hottest time of the day, but it is the time of the day with the most direct sunlight. This sunlight is responsible for heating up the earth’s atmosphere. It takes time for the atmosphere to heat up.
The diurnal cycle is the day and night cycle that is created when the earth turns on its axis. During this cycle, there is a delay between the time the earth-atmosphere system is exposed to the heat of the sun and when the temperature begins to increase on the earth’s surface. This delay is referred to as the thermal response. Depending on what time of the year it is, this thermal response can take as long as three to four hours.
The lowest temperatures of the day occur around dawn, or the time of day before sunrise. The earth’s surface has had all night to cool down at this time. After the sun rises, the temperature will being to increase again.