Which Month Is Summer 2025. This is the longest day of the year and marks the start of summer in. 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 its furthest tilt and begins to change directiion back.

32 rows view the month calendar of july 2025 calendar including week numbers. The table below will allow you to view the summer start and end dates for the years 2024, 2025 and 2026.