Summer 2024 Date Usa Time. — united states 2024 holiday calendar with all major holidays and observances. — astronomical summer officially arrives in the northern hemisphere — amidst a heat wave — at 4:51 p.m.
By logan reardon • published july 17, 2024 • updated. — 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.