What Is The Official First Day Of Summer 2024. The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m. For the northern hemisphere, the official summer season starts on june 20 or 21, depending on where you live, with the arrival of the summer solstice.
* the dates of summer given on this page are for the northern hemisphere (dates for the us). Is the first day of summer always the.