When Is The First Official Day Of Summer 2024. This year, the summer solstice falls on thursday, june 20 at 4:50 p.m. Here's why the first official day of summer is the longest day of the year for the northern hemisphere.

In 2024, the summer solstice will occur on june 20, at 20:51 gmt in the northern hemisphere, and on december 21, at 09:20 gmt in the southern hemisphere. Find out about the science of the solstice and well as its pagan roots and celebrations of fertility.