- Summer | Sunshine, Heatwaves, Vacations | Britannica
Summer, warmest season of the year, between spring and autumn In the Northern Hemisphere, it is usually defined as the period between the summer solstice (year’s longest day), June 21 or 22, and the autumnal equinox (day and night equal in length), September 22 or 23; and in the Southern
- Summer Solstice 2025: When Is The First Day of Summer?
The Summer Solstice happens on Friday, June 20, 2025! Find the answers to common questions, like: What is a solstice? Is the solstice the longest day of the year?—and more!
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