Summer Solstice 2025. The longest day of the year is traditionally marked on the summer solstice which will occur in 2025 on 21 june. Because of this position, the sun takes longer to.

What is the summer solstice? Summer solstice 2025 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost point and will be located at the maximum distance north of the celestial equator.