When Does Summer Start 2024. Astronomical summer officially arrives in the northern hemisphere — amidst a. The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m.
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. From an astronomical point of view, summer in the northern hemisphere officially begins on thursday, june 20 and ends on sunday, september 22.