What Is The First Day Of Summer 2024. For those of us in the northern hemisphere, earth is. Today (june 20) the summer solstice — the longest day of the year in the northern hemisphere — will begin, and it will be the earliest solstice in 228 years.
— in 2024, the summer solstice will occur at 4:50 p.m. — is the june solstice the first day of summer?