4 Seasons Weather Dates ★ Trusted & Certified

September 22 or 23 Meteorological Start: September 1

. National Centers for Environmental Information (NCEI) (.gov) +1 2026 Seasonal Dates (Northern Hemisphere) For the Northern Hemisphere, which includes North America, Europe, and most of Asia, the dates for 2026 are: Season Meteorological Dates Astronomical Start (2026) Spring March 1 – May 31 March 20 (Vernal Equinox) Summer June 1 – August 31 June 21 (Summer Solstice) Autumn September 1 – November 30 September 22 (Autumnal Equinox) Winter December 1 – February 28/29 December 21 (Winter Solstice) 2026 Seasonal Dates (Southern Hemisphere) In the Southern Hemisphere, including Australia, South Africa, and South America, the seasons are reversed: Time and Date +1 Season Meteorological Dates Astronomical Start (2026) Autumn March 1 – May 31 March 20 (Autumnal Equinox) Winter June 1 – August 31 June 21 (Winter Solstice) Spring September 1 – November 30 September 22 (Vernal Equinox) Summer December 1 – February 28/29 December 21 (Summer Solstice) Why the Dates Change Astronomical Timing 4 seasons weather dates

Summer is the warmest season of the year, defined by the tilt of the Earth's axis exposing the hemisphere to the most direct sunlight. September 22 or 23 Meteorological Start: September 1

March 20 or 21 Meteorological Start: March 1 which includes North America

Dates, Duration, and General Weather Characteristics for the Four Seasons. Calendar System: Northern Hemisphere (Standard Meteorological Definition).