How many days until summer?
Summer begins at the June solstice, the instant the Sun reaches its furthest point north. The count below names the time zone it used and whether today is included.
There are 318 days until the first day of summer, Monday 21 June 2027.
Days until summer
318 days remaining. Updating once a second.
- Date
- Weeks
- 45
- Hours
- 7,632
- Sleeps
- 318
Counting to midnight at the start of Monday 21 June 2027 in UTC (UTC, UTC+00:00). Today is not counted.
| Place | Offset now | Days until summer |
|---|---|---|
| Sydney, Australia | UTC+10:00 | 317 |
| Auckland, New Zealand | UTC+12:00 | 317 |
| Delhi, India | UTC+05:30 | 318 |
| London, United Kingdom | UTC+01:00 | 318 |
| New York, United States | UTC-04:00 | 318 |
| Los Angeles, United States | UTC-07:00 | 318 |
Counted in UTC (GMT), not counting today.
Change either and every figure above updates. Most date tools pick a zone and a counting rule silently, which is why two sites can answer the same question with different numbers.
Summer 2027 at a glance
| Date | Monday 21 June 2027 |
|---|---|
| Days to go | 318 |
| Weeks | 45 |
| Hours | 7,632 |
| Exact instant | 14:10 UTC |
| Meteorological start | Tuesday 1 June 2027 |
Show the working
Today is Friday 7 August 2026 and the first day of summer is Monday 21 June 2027. Subtracting one calendar date from the other gives 318 days.
That count treats both as calendar dates and does not count today, which is what almost everyone means by "days until". Counting today as well gives 319. Measuring the clock time still to run gives 317 days plus the hours on the readout, because part of today has already gone.
All three are correct answers to slightly different questions, and it is exactly why pages ranking for this search return numbers that differ by one or two. The readout names the basis it used and the control under it changes both.
Summer begins at the June solstice, the instant the Sun reaches its furthest point north.
Astronomical or meteorological
Astronomical summer begins at the June solstice, which this year falls at 14:10 UTC on 21 June 2027. Meteorologists instead cut the year into four fixed three-month blocks, which puts the start at 1 June 2027 every year.
Both answers are defensible and they disagree by about three weeks. The equinox and the solstice are real events in the sky; the meteorological dates exist so that climate records can compare whole months. This page counts to the astronomical one and gives the other beside it.
South of the equator the same instant begins the opposite season. The Sun standing furthest north is furthest from Sydney and Cape Town, not closest.
It is an instant, so the date depends on where you are
Because it is a moment rather than a day, two people in different time zones can correctly give different dates for it. 14:10 UTC is a different calendar date once you are far enough east or west, and this page states the zone it used.
The instant comes from astronomy-engine, precomputed for every year from 1900 to 2100, and is accurate to well under a minute. Even so the date can differ by zone when the crossing falls close to local midnight, which is why the September equinox lands on the 22nd in the Americas and the 23rd in Europe in some years.
How this date is set
Astronomical summer in the northern hemisphere begins at the June solstice, the moment the Sun reaches an ecliptic longitude of 90 degrees and stands furthest north. It is an instant, not a day, so the date it lands on depends on your time zone. Meteorologists instead divide the year into four fixed three-month blocks, which puts the start of summer at 1 June every year.
the first day of summer in the next ten years
| Year | Date | Weekday | Days away |
|---|---|---|---|
| 2027 | 21 June | Monday | 318 |
| 2028 | 20 June | Tuesday | 683 |
| 2029 | 21 June | Thursday | 1,049 |
| 2030 | 21 June | Friday | 1,414 |
| 2031 | 21 June | Saturday | 1,779 |
| 2032 | 20 June | Sunday | 2,144 |
| 2033 | 21 June | Tuesday | 2,510 |
| 2034 | 21 June | Wednesday | 2,875 |
| 2035 | 21 June | Thursday | 3,240 |
| 2036 | 20 June | Friday | 3,605 |
Dates around summer
| Occasion | Falls on | Days away |
|---|---|---|
| Meteorological summer begins | Tuesday 1 June 2027 | 298 |
| June solstice | Monday 21 June 2027 | 318 |
| September equinox | Thursday 23 September 2027 | 412 |
Next
Questions
How many days until summer?
318 days, counting to midnight at the start of Monday 21 June 2027 in the time zone shown on the readout.
When does summer start?
Astronomically at 14:10 UTC on 21 June 2027. By the meteorological definition, on 1 June 2027.