Summer Solstice 2024 Usar. Astronomical summer officially arrives in the northern hemisphere — amidst a heat wave — at 4:51 p.m. By the time we reach the summer solstice on june 20, 2025, it will be the longest day of the year.
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. For those of us in the northern hemisphere, earth is tilting mostly.