When does summer start?
Astronomical summer in the Northern Hemisphere starts at the June solstice. It falls on June 20 or 21, depending on the year and your time zone. This countdown uses June 21.
The solstice is the longest day of the year north of the equator. After it, the days slowly get shorter again.
Meteorological summer
Weather services count summer as the whole months of June, July and August, so meteorological summer starts on June 1.
In the Southern Hemisphere the seasons are reversed. Summer there starts at the December solstice, on December 21 or 22.
Ways to use the summer countdown
- Count down the last weeks of the school year.
- Plan a summer trip and book while prices are lower.
- Work toward a fitness goal with a clear finish date.
- See how long is left until the holidays.
Questions and answers
How many days until summer?
There are 242 days until the first day of summer on Monday, June 21, 2027. The countdown on this page updates every second.
What is the first day of summer 2027?
This countdown uses Monday, June 21, 2027, the June solstice. Depending on the year and time zone, the solstice can fall on June 20 instead.
What is the longest day of the year?
In the Northern Hemisphere, the June solstice on June 20 or 21. In the Southern Hemisphere, it is the December solstice.
When does summer start in the Southern Hemisphere?
At the December solstice, on December 21 or 22. By the weather calendar, summer there starts on December 1.
When does summer end?
Astronomical summer ends at the September equinox, around September 22 or 23. Meteorological summer ends on August 31.