When Is The First Day Of Summer In 2025. The start of summer date from 2022 to 2025. The next summer solstice for the northern hemisphere will occur on june 20, 2024, and the next summer solstice for the southern hemisphere will occur on dec.

That also happens to be the summer solstice, aka the start of summer. In the northern hemisphere, it always occurs around june 20 or 21.