When Is Summer 2024 Usa. Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having reached its furthest tilt and begins to change directiion back. Summer 2024 starts on saturday and ends on saturday.
The summer solstice happens on thursday, june 20, 2024! This year, the first day of summer, also known as the summer solstice, is thursday, june 20.