Longest Day Of The Year 2024 Uk. The 'longest day' and 'shortest night' of the year. The summer solstice is the longest day of the year, meaning the day of the year that has the most hours of sunlight.

The summer solstice occurs for earth’s upper half when the northern hemisphere is tilted most closely toward the sun. The summer solstice most commonly falls on june 21 but is not always on.