First Day Of Summer 2024 Date. * the dates of summer given on this page are for the northern hemisphere (dates for the us). Thursday, june 20 is the official first day of northern astronomical summer for 2024 — summer solstice — which is the longest day of the year for this half of the planet.
The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m. Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in north america.