First Official Day Of 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.  — when do the four seasons start in 2024—for spring, summer, fall, and winter?

 — hope you’ve got your pencils ready and your calendars out: That’s the date of this year’s summer solstice.