Longest Day Australia 2025 Elections. The midnight sun is a natural phenomenon that occurs in regions near the earth's poles, notably in the. In 2025, sydney’s longest day falls on saturday, december 21, with 8.20pm marking the exact time of the solstice in the harbour city.

It also lists astronomical sunrise and sunset timings on summer solstice. Australia will have its longest day of the year today as the southern hemisphere experiences its summer solstice.