World Longest Day 2025 Location. 20 june will be the longest day of 2025 in the northern hemisphere, midsummer day. Locations closer to the poles experience greater differences in day length throughout the year, so summer days are longer there.

This is the day when the sun’s annual journey through the constellations of the zodiac carries it to its. The longest day (summer solstice) is observed on either june 20, 21, or 22, but this year, it falls on june 21.