When Is Summer 2024 Date. Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having reached its furthest tilt and begins to change directiion back. What exactly is the summer solstice?

March 19, 2024 (vernal equinox) summer: In different time zones, the date of the solstice can differ by a day, so it is important to indicate your exact location.