First Day Of Summer 2024

First Day Of Summer 2024. Usually, when we talk about the first day of summer, we are referring to the astronomical summer which is defined by the earth's axis and orbit around the sun. On that day, the autumnal equinox will occur, marking the beginning of fall.

The first day of what’s projected to be an unusually hot summer, the longest day of the year and the summer solstice all arrive thursday, june 20. In the northern hemisphere this year, the first day of summer is thursday, june 20, 2024.