While the dates above are used for weather forecasting, (based on the solstices and equinoxes) vary slightly each year (usually falling between the 19th and 22nd of the starting month).
Spring begins with the . On this day, the sun crosses the celestial equator from south to north. For those in the Northern Hemisphere, it marks the moment when day and night are nearly equal in length. 4 seasons weather dates
. 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 While the dates above are used for weather