Summer Solstice 2024 Usa 2024. Here's everything you need to know about the northern hemisphere's longest day of the year. This year, the first day of summer, also known as the summer solstice, is thursday, june 20.
The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m. Here’s everything you need to know about the northern hemisphere’s longest day of the year.