Summer Solstice 2025 Australia 2025. The summer solstice is the first day of astronomical summer, although the more logical metrological summer begins december 1st / june 1st (depending on hemisphere). Here's everything you need to know about the northern hemisphere's longest day of the year.

Australia will have its longest day of the year today as the southern hemisphere experiences its summer solstice. Download the free 2025 australia calendar with dates you can’t miss for the year.