First Day Of Summer 2024 Time. I n 2024, june 20 marks the summer solstice, the first official day of astronomical summer. This year's summer solstice will arrive this thursday on june 20 for the northern hemisphere, according to nasa.
When is the first day of summer in 2024? On the contrary, the summer solstice is the day when the sun climbs to its highest point and spends the longest above the horizon.