What Is The First Day Of Summer 2024. That’s just after father’s day and juneteenth —so we recommend keeping the. This year the summer will start on thursday june 20, 2024 (day of the summer solstice) and will end on sunday september 22, 2024 with the autumnal equinox.

This is the longest day of the year and marks the start of. Astronomers consider this the beginning of the summer in the northern hemisphere, nasa said.