What Is The Longest Day Of The Year 2025. Six holidays will occur on weekends and several will. The summer solstice occurs in june in the northern hemisphere and marks midsummer:

The amount of daylight only goes down from here….for the next six months (more on that later). During summer the day of the solstice is the longest day of the year and during winter the day of the solstice is the shortest day of the year.