How Long Is Summer 2025 Till 2025 Summer. In india, this astronomical event will be observed on. Summer 2025 starts on thursday, 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 directiion back.
Thursday, 20 june 2025, 11.51 pm. This summer lasts 92 days and ends on september 21, 2025.