The Summer Solstice 2024 Calendar. The first day of summer arrives with the solstice this year on thursday, june 20, 2024 at 4:51 p.m. Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having reached its furthest tilt and begins to change directiion back.

The summer solstice is also known as the longest day, which is perhaps the most notable feature. This is the longest day of the year and marks the start of summer in the northern hemisphere.