What Day Is The Summer Solstice 2024. Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere. Today (june 20) the summer solstice — the longest day of the year in the northern hemisphere — will begin, and it will be the earliest solstice in 228 years.

The summer solstice takes place at approximately. In the northern hemisphere, the 2024 summer solstice will occur on june 20 at 20:51 gmt (4:51 p.m.