First Day Of Summer 2024 In Usa. This is the longest day of the year and marks the start 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.
Eastern time, according to the u.s. The first day of summer arrives with the solstice this year on thursday, june 20, 2024 at 4:51 p.m.
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