When is the First Day of Summer?

Date and Time of the Southern and Northern Hemisphere Summer Solstice 2024

Summer begins with the solstice on Thursday, June 20, 2024, marking the astronomical first day of summer in the Northern Hemisphere.

The Summer Solstice

The summer solstice occurs during the hemisphere's summer. In the Northern Hemisphere, this is the June solstice (June 20, 21, or 22), and in the Southern Hemisphere, it's the December solstice (December 21 or 22).

Longest Day of the Year

The summer solstice marks the longest day of the year for the Northern Hemisphere. This is because Earth's axis is tilted towards the sun during this time, resulting in more daylight hours.