Summer Solstice 2025 Canada Time. 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. Summer starts at the moment when the sun is farthest north:
(ignoring daylight savings time) occurs. Friday, jun 20 7:32 pm pdt.