Uruguay’s meteorological institute has announced the official start of winter 2026. The winter season in the Southern Hemisphere will begin in June. Specifically, the transition from autumn to winter will occur on June 21st, 2026. The exact time of the winter solstice in Uruguay will be 5:42 PM local time. This marks the shortest day and longest night of the year for the country. The announcement provides precise chronological details regarding the seasonal change.