When Is Summer Time In 2025. In india, the summer solstice 2025 will happen on june 21 at 8:09 pm ist. In the uk, once summer is over the clocks.

The first day of summer is also known as the summer solstice, and in 2025 it happens on thursday, june 20 at 4:51 p.m. Today (june 20) the summer solstice — the longest day of the year in the northern hemisphere — will begin, and it will be the earliest solstice in 228 years.