When Does Summer Officially Start Uk 2024. The royal museum greenwich states that the sunrise and sunset will appear an hour later in the summer. Usually, when we talk about the first day of autumn we are referring to the astronomical autumn which is defined by the earth's axis and orbit around the sun.

The seasons are defined as spring (march, april , may), summer (june, july,. Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere.