Summer Solstice 2025 Australia Date. 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. Date # days season start;

It also lists astronomical sunrise and sunset timings on summer solstice. Find out the date when june solstice is in 2025 and count down the days until june solstice with a countdown timer.