First Day Of Summer 2024 Calendar Dateinasia. This year, the first day of summer, also known as the summer solstice, is thursday, june 20. Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere.
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. Is it really the longest day of the year?