When Is The First Day Of Summer 2024 Uk 2024. Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere. Longest day of the year 2024 in united kingdom.

What exactly is the summer solstice? Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the.