Longest Day Australia 2025 Date. The current season in australia is summer. On december 21, 2025 — the longest day of the year in the southern hemisphere — people in sydney, australia, will experience 14 hours, 24 minutes, and 47 seconds of sunlight.

But just how much daylight you’ll get depends on where you. According to weatherzone, hobart will experience the longest day, with 15 hours and.