First Day Of Winter 2025 Australia. The winter solstice, which marks the first day of winter 2025, occurs on saturday, december 21, 2025 at 4:21 a.m. The bureau of meteorology's (bom) first winter forecast of 2025 has confidently declared one of the warmest on record throughout australia.

However, the winter solstice in the southern hemisphere will take place on june 21st, 2025 at 6:50 am. Learn all about the shortest day of the year—and tell us what winter means to you!