Summer Solstice 2025 In Canada. When do the four seasons start in 2025—for spring, summer, fall, and winter? 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.
In the northern hemisphere, it typically occurs in late june. In the southern hemisphere, it occurs in late.