When Is Summer 2024 In Usa 2024. When does summer start in 2024. 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.
Summer break dates in the united states for 2024 vary widely by school district. This is the longest day of the year and marks the start of.