Summer First Day 2024. On thursday, everyone in the northern half of our planet will experience the summer solstice. Here are the equinox and solstice dates—plus, answers to common questions.
In 2024, the summer solstice will occur at 4:50 p.m. When is first day of summer in 2024 is thursday, june 20, and it lasts until sunday, september 22, inclusive.