When Is The First Day Of Summer 2026. Summer solstice 2026 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost point and will be. Summer 2026 starts on sunday, june 21st 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.

2025, 2026, 2027, 2028, 2029, 2030, 2031, 2032, 2033, 2034 and 2035. Summer starts at the moment when the sun is farthest north: