When Exactly Does Winter 2026 Begin in Uruguay?

Uruguay will officially welcome winter on Sunday, June 21, 2026, at precisely 05:24 AM local time. This transition occurs with the June solstice, marking the shortest day of the year in the Southern Hemisphere.

The term "solstice" originates from the Latin "solstitium," meaning "sun stands still." This phenomenon occurs when the sun reaches its highest or lowest point in the sky relative to the celestial equator. For the Southern Hemisphere, the June solstice signifies the end of autumn and the beginning of winter, while simultaneously marking the end of spring and the start of summer in the Northern Hemisphere, where it represents the longest day of the year.

Following the solstice, although days will gradually begin to lengthen, temperatures are expected to continue dropping. This effect, known as "seasonal lag," occurs because the Earth, particularly its oceans, takes time to lose accumulated heat. This contrasts with planets like Mars, which experience more immediate temperature shifts due to their lack of oceans.

Winter in the Southern Hemisphere, including Uruguay, is projected to be the longest season of the year. Astronomical calculations based on Earth's elliptical orbit indicate a duration of approximately 93 days, 15 hours, and 40 minutes. This extended winter season will conclude with the spring equinox on September 22, 2026.