If you had to guess the hottest time of day, what time would you choose? Would it be noon? 2 oclock or maybe even later? Unless something else acts on it, like a cold front or a thunderstorm, the hottest time of day is usually between 5PM and 6PM. The time of day when the suns rays are most direct this time of year is between 2 and 4PM. In the winter the hottest time of day is between 4 and 5PM.