How Many Days Until Summer?
Live countdown to the astronomical start of Summer in the Northern Hemisphere.
Time Breakdown
- • Total Months: ~10.1 months
- • Total Weeks: 43.7 weeks
- • Business Days Left: 218
- • Target Day: Monday
Northern Hemisphere Note
This countdown tracks the Northern Hemisphere summer solstice. In the Southern Hemisphere, this exact same astronomical moment marks the start of Winter, its shortest day of the year, not the longest.
What Marks the Start of Astronomical Summer
The summer solstice is the moment the Northern Hemisphere is tilted most directly toward the sun, making it the longest day and shortest night of the year there. From this point, days slowly begin shortening again on their way toward the Autumnal Equinox.
Why the Exact Date Shifts Year to Year
A calendar year runs 365 days, but Earth's actual orbit takes about 365.24 days. That extra quarter day means the solstice lands roughly six hours later each year until a leap year adds a day back and resets it earlier. That's why Summer typically starts on June 20 or 21 rather than a perfectly fixed date.
Astronomical vs. Meteorological Summer
This page uses the astronomical definition, tied to the solstice. Meteorological Summer is fixed as June 1 through August 31 every year, based on the twelve month calendar rather than Earth's orbital position, used mainly for consistent climate and weather record keeping.
June 2027 Calendar View
Frequently Asked Questions
Monday, June 21, 2027, at 10:11 a.m. Eastern Time, marking the summer solstice.
No. This is the Northern Hemisphere summer solstice. At the same moment, the Southern Hemisphere is experiencing its winter solstice, its shortest day of the year.
Because a calendar year and Earth's orbital year aren't exactly the same length, the solstice drifts by about six hours annually and resets with each leap year, keeping it within a two day range rather than one fixed date.
Astronomical Summer is tied to the solstice and its exact date shifts slightly year to year. Meteorological Summer is fixed as June 1 through August 31 every year, used mainly for consistent climate record keeping.