Summer Solstice 2025 End. Modern astronomical summer begins at the summer solstice (longest day) which is around 21st june and meteorological summer begins on 1st june. Wednesday, june 21, is the longest day of 2023, and the start of the summer season, for anyone living north of the equator.

Here’s why this day is the longest day of the year, with the most. Given that the sun passes directly overhead on the solstice—and it’s the day with the most sunlight—one wouldn’t be off.