First Day Of Autumn 2024 Dates Uk. The meteorological seasons are defined as spring (march, april, may); In 2024 the autumnal equinox will occur on 22 september at 12.44pm gmt (1.44pm bst).
Find out more about equinoxes and solstices. The seasons are defined as spring (march, april, may), summer (june, july, august), autumn.