Summer Solstice 2025 Canada 2025. 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. December 21 marks the winter solstice—the shortest day and the longest night of the year in the northern hemisphere.
In 2024, summer solstice in the northern hemisphere will occur on thursday, june 20 around 4:50 p.m. It is the longest day of the year that marks the arrival of the summer season.