: This is based on the Earth's position relative to the sun. It begins at the Summer Solstice (the longest day of the year) and ends at the Autumnal Equinox . In the Northern Hemisphere, this usually runs from June 21st to September 22nd . The Experience of Summer
In the Northern Hemisphere, the warmest months of the year are typically June, July, and August. Therefore, meteorological summer begins and ends August 31st . what month is summer