First Day Of Summer 2024 Celebrations Bakery. This means the summer solstice will happen in the northern hemisphere at 4:51 pm edt or 1:51 pm pdt. This is the longest day of the year and marks the.

Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere. This day is also known as the summer solstice.