When Does Summer Start 2024. 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. March 19, 2024 (vernal equinox) summer:
What are the dates for the four seasons in 2024? What exactly is the summer solstice?