June 21 Summer Solstice 2024 Longest Day. It’ll be the longest day of the year north of the equator, and it is the. Wednesday, june 21, is the longest day of 2023, and the start of the summer season, for anyone living north of the equator.

It nearly always falls on june 21, but can also. The event occurs on the first day of the astronomical summer season, marking the moment when the northern hemisphere is directly facing the sun.