When Is Summer 2024. Here's everything you need to know about the northern hemisphere's longest day of the year. When do the four seasons start in 2024—for spring, summer, fall, and winter?
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. Here’s when the holiday falls in 2024 and why its celebrated.