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

The summer solstice, the longest day of the year in the Northern Hemisphere, falls on June 20 this year in North America, and June 21 in Europe.

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.