Summer Solstice 2025 Canada Time. Canada the exact moment of the summer solstice in 2025 is 20 june, at 22:42:02. The summer solstice is the first day of astronomical summer, although the more logical metrological summer begins december 1st / june 1st (depending on hemisphere).
It is the longest day of the year that marks the arrival of the summer season. This refers to the northern hemisphere of the earth.