Summer in the UK ends on different dates depending on the definition used:
- Meteorological summer ends on August 31. This definition divides the year into four fixed three-month periods: June, July, and August for summer.
- Astronomical summer ends around September 22, aligning with the autumnal equinox, when day and night are approximately equal.
Meteorological summer is often used for weather and climate purposes, while astronomical summer is based on the Earth's position relative to the sun. Thus, summer can be said to end either on August 31 or September 22, with August 31 being the more common marker in daily life in the UK.
