Summer 2024 Start Date In Usa. The first official day of summer astronomically for 2024 is thursday, june 20, which is when the northern hemisphere has the longest day of the year, according. This year's summer solstice will arrive this thursday on june 20 for the northern hemisphere, according to nasa.
How to watch the 2024 olympics opening ceremony. The 2024 summer solstice arrives june 20 at 4:51 p.m.