How Many More Months Until Summer 2025. 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. Create a countdown for june 5, 2025 or share with friends and family.
It will be on a tuesday and in week 27 of 2025. The table below will allow you to view the summer start and end dates for the years 2024, 2025 and 2026.