Solstice 2025 Summer History. Edt (2051 gmt) in 2025, marking the longest day of the year in the northern hemisphere.  — the summer solstice marks the first day of summer.

It was also the warmest across europe at 1.54c.  — learn how to celebrate litha 2025, also known as the summer solstice, a pagan festival of joy, growth, and creativity.