The 2025 summer solstice takes place on June 20, heralding the onset of astronomical summer and the longest day of the year.

Summer gets its official start in the Northern Hemisphere with the arrival of the summer solstice. The sun will trace its highest, longest arc across the sky Friday, making for the longest day and shortest night of the year.

Summer officially began Friday in the Northern Hemisphere with the longest daylight of the year at around 15 hours.