When Is Summer Solstice 2025 Uk. Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having reached its furthest tilt and begins to change. It ends on 20 march 2025 with the spring equinox.

When is summer solstice 2025. In 2025, the solstice moment will fall at 2:42 utc on june 21 (9:42 p.m.