First Day Of Summer 2024 In Usa. Residents in the northern hemisphere will experience the longest day of the year on thursday, june 20 due to the sun being at its highest point in the sky that day. This year, the first day of summer, also known as the summer solstice, is thursday, june 20.

The first official day of summer astronomically for 2024 is thursday, june 20, which is when the northern hemisphere has the longest day of the year, according to the farmer’s almanac. In the northern hemisphere, the summer solstice is the.