Date & time / TOOL

Summer Countdown: How Many Days Until Summer?

A live countdown to the first day of summer, the June solstice.

The first day of summer 2027 in the northern hemisphere is Monday, 21 June, when the solstice arrives at 14:11 UTC. The live countdown below shows the days, hours, minutes and seconds left to that moment in your own time zone, plus the solstice dates to 2036.

Updated October 31, 2026

INTERACTIVE TOOL

Countdown

First day of summer

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Days

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Hours

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Minutes

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Seconds

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Days left

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Weeks + days

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Sleeps

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Hours left

Counted to midnight at the start of First day of summer, using the clock and time zone of your device.

QUICK ANSWER

Astronomical summer in the northern hemisphere starts at the June solstice. In 2027 it falls on Monday, 21 June, at 14:11 UTC (10:11 a.m. EDT, 7:11 a.m. PDT); in 2028 it comes a day earlier, on 20 June. The countdown above runs to that exact moment in your time zone. Meteorologists count summer from 1 June instead.

THE METHOD

How it works

Days left = the date of the holiday minus today’s date. The live counter subtracts the current time from midnight at the start of the holiday in your time zone, then splits the difference into days, hours, minutes and seconds. Christmas is 25 December, Halloween is 31 October and US Thanksgiving is the fourth Thursday in November.

PUT IT TO USE

Example calculation

On 28 October 2026, Halloween (31 October) is 3 days away, Thanksgiving (26 November) 29 days and Christmas Day (25 December) 58 days: 3 days left in October, 30 in November and 25 in December. 58 days is 8 weeks and 2 days.

Astronomical summer and meteorological summer

Astronomers date the seasons from the solstices and equinoxes, so summer runs from the June solstice to the September equinox (23 September 2027 at 06:02 UTC). Weather services group whole months instead: meteorological summer is June, July and August in the northern hemisphere, which makes 1 June the first day of summer for climate records.

Why the date moves between 20 and 21 June

A year is about 365.24 days long, so the solstice arrives roughly 6 hours later each year until a leap day pulls it back. In US Eastern Time it falls on 20 June in 2028, 2029, 2032, 2033 and 2036, and on 21 June in the other years to 2036; on the West Coast, 2034 is a 20 June year too. It is also the longest day of the year north of the equator.

Summer in the southern hemisphere

In Australia, New Zealand, South Africa and South America the seasons are reversed: the December solstice (21 December 2026 at 20:50 UTC, already 22 December in Sydney and Auckland) starts astronomical summer, and meteorological summer runs from 1 December to the end of February. For the start of spring, see the spring countdown.

In short

How to use the Summer Countdown

Open the page: the countdown starts at once, in your time zone.
Read the days, hours, minutes and seconds left until the solstice.
Check the weeks and sleeps left in the second row.
Look up the solstice date for a later year in the table.

Quick reference

First day of summer: dates for the next 10 years

Year	Date	Day of the week
2027	June 21, 2027	Monday
2028	June 20, 2028	Tuesday
2029	June 20, 2029	Wednesday
2030	June 21, 2030	Friday
2031	June 21, 2031	Saturday
2032	June 20, 2032	Sunday
2033	June 20, 2033	Monday
2034	June 21, 2034	Wednesday
2035	June 21, 2035	Thursday
2036	June 20, 2036	Friday

Screenshot of the Summer Countdown on this site with a worked example filled in — Screenshot: the Summer Countdown with the example values entered.

Accuracy

How we checked this

We compared 6 results from this calculator with values we worked out independently, using exact decimal arithmetic and the published definitions, on October 28, 2026. 6 of 6 matched to the precision shown.

Input	Independent value	This page	Match
First day of summer 2027	June 21, 2027, Monday	June 21, 2027, Monday	Yes
First day of summer 2028	June 20, 2028, Tuesday	June 20, 2028, Tuesday	Yes
First day of summer 2029	June 20, 2029, Wednesday	June 20, 2029, Wednesday	Yes
First day of summer 2032	June 20, 2032, Sunday	June 20, 2032, Sunday	Yes
First day of summer 2033	June 20, 2033, Monday	June 20, 2033, Monday	Yes
First day of summer 2035	June 21, 2035, Thursday	June 21, 2035, Thursday	Yes

From the source

The times of the equinoxes mark the beginning of spring and fall. The times of the solstices mark the beginning of summer and winter.

Source: U.S. Naval Observatory: Earth’s seasons

Sources

U.S. Naval Observatory: Earth’s seasons, equinoxes and solstices

GOOD TO KNOW

Frequently asked questions

When is the first day of summer 2027?

Monday, 21 June 2027. The solstice is at 14:11 UTC, which is 10:11 a.m. Eastern Daylight Time.

Is summer on 1 June or 21 June?

Both are used: 1 June is the start of meteorological summer, and the June solstice (20 or 21 June) is the start of astronomical summer.

What is the longest day of the year?

The day of the June solstice in the northern hemisphere: 21 June in 2027.

How many weeks until summer?

Divide the days left by 7; the “Weeks + days” box above does it for today.

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