When Is 2025 Summer Solstice. This happens around june 21 each year. The summer solstice occurs when the sun is directly over the tropic of cancer, which is located at 23.5° latitude north, and runs through mexico, the bahamas,.

The longest day (summer solstice) is observed on either june 20, 21, or 22, but this year, it falls on june 21. This solstice marks the official beginning of summer in the northern hemisphere, occurring when earth arrives at.