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href='/company/team-editorial#kb'>Konstantin Bikos</a></p><p class=article__lead>The summer solstice marks the start of summer. In the Northern Hemisphere, the summer solstice is in June; south of the equator, it is in December.</p><div class=article__body><figure class="article__figure "><div class=article__img-container><img src="//c.tadst.com/gfx/600x337/summer-dog.jpg?1" width=600 height=337 alt="Illustration image" class=article__img srcset="//c.tadst.com/gfx/900x506/summer-dog.jpg?1 1.5x,//c.tadst.com/gfx/1200x675/summer-dog.jpg?1 2x"></div><figcaption><p class=article__img-caption>In temperate climes, the summer season brings warm weather and long days.</p><p class=article__img-credit>©iStockphoto.com/damedeeso</p></figcaption></figure><p class=large-link><a href="/news/astronomy/solstice-equal-day-and-night">Equal day and night? It can happen at the solstice!</a></p><h2>Summer 2024 and 2025 Date</h2><p>According to the <strong>astronomical definition</strong>, the start of summer falls on the <strong>summer solstice</strong>. In the <a href="/geography/southern-northern-hemisphere.html">Northern Hemisphere</a>, it's the <a href="/calendar/june-solstice.html">June solstice</a>; south of the equator, it is the <a href="/calendar/december-solstice.html">solstice in December</a>.</p><p class=large-link><a href="/astronomy/equinox-solstice.html">What is a solstice?</a></p><div class=" detail info note hemisphere-note"><h3 class="mgb0 ">Summer Solstice, Northern Hemisphere (June)</h3><p>North America, Europe, most of Asia, Northern Africa</p><img src="//c.tadst.com/gfx/600x337/hemisphere-nth-nobg.png?1" width=600 height=337 alt="World map showing the Northern Hemisphere highlighted above the line marking the Equator." class=hemisphere-map srcset="//c.tadst.com/gfx/900x506/hemisphere-nth-nobg.png?1 1.5x,//c.tadst.com/gfx/1200x675/hemisphere-nth-nobg.png?1 2x"><p>In Singapore, Singapore: <strong class=big>Saturday, 21 June 2025, 10:42 SGT</strong> <a href="/custom/location.html" id=chi>(Change location)</a><br>This corresponds to Saturday, 21 June 2025, 02:42 UTC.</p><ul><li><a href="/sun/singapore/singapore?month=6&year=2025">Sun rise/set and day length around this solstice</a></li><li><a href="/countdown/generic?p0=236&iso=20250621T104215&msg=June%20solstice%202025%20Countdown">Solstice countdown</a></li><li><a href="/worldclock/fixedtime.html?iso=20250621T0242&msg=June%20solstice%202025">Local times for this solstice worldwide</a></li><li><a href="/worldclock/sunearth.html?iso=20250621T0242">Solstice Day and Night Map</a></li></ul></div><div class=" detail info note hemisphere-note"><h3 class=mgb0>Summer Solstice, Southern Hemisphere (December)</h3><p>Australia, New Zealand, South America, southern Africa</p><img src="//c.tadst.com/gfx/600x337/hemisphere-sth-nobg.png?1" width=600 height=337 alt="World map showing the Southern Hemisphere highlighted below the line marking the Equator." class=hemisphere-map srcset="//c.tadst.com/gfx/900x506/hemisphere-sth-nobg.png?1 1.5x,//c.tadst.com/gfx/1200x675/hemisphere-sth-nobg.png?1 2x"><p>In Singapore, Singapore: <strong class=big>Saturday, 21 December 2024, 17:20 SGT</strong> <a href="/custom/location.html" id=chi>(Change location)</a><br>This corresponds to Saturday, 21 December 2024, 09:20 UTC.</p><ul><li><a href="/sun/singapore/singapore?month=12&year=2024">Sun rise/set and day length around this solstice</a></li><li><a href="/countdown/generic?p0=236&iso=20241221T172034&msg=December%20solstice%202024%20Countdown">Solstice countdown</a></li><li><a href="/worldclock/fixedtime.html?iso=20241221T0920&msg=December%20solstice%202024">Local times for this solstice worldwide</a></li><li><a href="/worldclock/sunearth.html?iso=20241221T0920">Solstice Day and Night Map</a></li></ul></div><h2>Alternative Summer Start Dates</h2><p><strong>Meteorologists</strong> use a different method of defining the first day of summer. And, in some countries, the beginning of the seasons is determined by <strong>average temperatures</strong> rather than fixed dates or astronomical events.</p><p class=large-link><a href="/calendar/aboutseasons.html">Meteorological and other seasons definitions</a></p><h2>Days Get Shorter During Summer</h2><p>Astronomical summer begins at the summer solstice, which is the <strong>longest day of the year</strong>. This means days get shorter during summer—very slowly at first, but at ever-larger daily intervals as the <a href="/calendar/september-equinox.html">September equinox</a> approaches, heralding the <a href="/calendar/autumnal-equinox.html">start of fall</a>.</p><p>Locations <strong>closer to the poles</strong> experience larger differences in day length throughout the year, so <strong>summer days are longer</strong> there. In <a href="/sun/canada/toronto?month=6">Toronto</a>, the longest day is just over 15 hours and 26 minutes long; in <a href="/sun/usa/miami?month=6">Miami</a>, roughly 2000 kilometers or 1200 miles farther south, it lasts about 13 hours and 45 minutes.</p><p>Places within the <strong>polar circles</strong> experience <a href="/astronomy/midnight-sun.html">Midnight Sun or polar day</a> during all or part of the summer season when the <strong>Sun does not set at all</strong>.</p><p class=large-link><a href="/astronomy/equation-of-time.html">Earliest sunrise is not on the longest day</a></p><figure class="article__figure article__figure--zoomable" data-tad-control=ClassOnClick data-tad-options="{classname: 'article__figure--zoomed'}"><div class=article__img-container><img src="//c.tadst.com/gfx/600x337/june-solstice-dark.png?1" width=600 height=337 title="June solstice illustration" alt="Earth's position in relation to the Sun's rays at the June solstice." class=article__img srcset="//c.tadst.com/gfx/900x506/june-solstice-dark.png?1 1.5x,//c.tadst.com/gfx/1200x675/june-solstice-dark.png?1 2x"></div><div class=article__lightbox><img src="//c.tadst.com/gfx/1200x675/june-solstice-dark.png?1" width=1200 height=675 title="June solstice illustration" alt="Earth's position in relation to the Sun's rays at the June solstice." class=article__img-large loading=lazy></div><figcaption><p class=article__img-caption>Earth's position in relation to the Sun's rays at the June solstice.</p><p class=article__img-credit>© timeanddate.com</p></figcaption></figure><h2>Shorter Days, but Rising Temperatures</h2><p>Although <a href="/worldclock/sunearth.html">daylight</a> hours decrease during the summer months, <a href="/scripts/go.php?type=climate">temperatures continue to rise</a> in most regions. This is because it takes time for Earth, particularly its oceans, to change temperature—an effect known as <strong>seasonal lag</strong>. (As a comparison, the planet Mars has seasons but no oceans, so there is almost no seasonal lag.).</p><h2>Summer Traditions and Folklore</h2><p>The start of summer and the summer solstice are celebrated in cultures and religions around the world with various <strong>traditions, holidays, and festivals</strong>.</p><p class=large-link><a href="/calendar/june-solstice-customs.html">Summer festivals: Midsummer, Epona, and a celebration of femininity</a></p><h2>Summer Months</h2><p>In the Northern Hemisphere, astronomical and meteorological summer runs from June to September. South of the <a href="/geography/equator.html">equator</a>, it starts in December and ends in March. Read more about the <strong>history and meaning</strong> of the summer months:</p><h4>Northern summer months</h4><p><a href="/calendar/months/june.html">June</a> | <a href="/calendar/months/july.html">July</a> | <a href="/calendar/months/august.html">August</a> | <a href="/calendar/months/september.html">September</a></p><h4>Southern summer months</h4><p><a href="/calendar/months/december.html">December</a> | <a href="/calendar/months/january.html">January</a> | <a href="/calendar/months/february.html">February</a> | <a href="/calendar/months/march.html">March</a></p><h2>How Long Is Summer?</h2><p>The Earth does not move at a constant speed in its elliptical orbit, so the seasons are not of equal length. On average, summer lasts for <strong>93.6 days</strong> in the Northern Hemisphere and <strong>89.0 days</strong> in the Southern Hemisphere.</p><p><strong>Average season lengths:</strong></p><ul><li><a href="/calendar/march-equinox.html">March equinox</a> to <a href="/calendar/june-solstice.html">June solstice</a>: 92.8 days</li><li><a href="/calendar/june-solstice.html">June solstice</a> to <a href="/calendar/september-equinox.html">September equinox</a>: 93.6 days</li><li><a href="/calendar/september-equinox.html">September equinox</a> to <a href="/calendar/december-solstice.html">December solstice</a>: 89.8 days</li><li><a href="/calendar/december-solstice.html">December solstice</a> to <a href="/calendar/march-equinox.html">March equinox</a>: 89.0 days</li></ul><p class=article__htags><strong>Topics: </strong><a href="/topics/astronomy">Astronomy</a>, <a href="/topics/seasons">Seasons</a>, <a href="/topics/december">December</a>, <a href="/topics/june">June</a>, <a href="/topics/sun">Sun</a>, <a href="/topics/solstice">Solstice</a></p></div></article><aside class="layout-grid__sidebar article__sidebar"><div class="clip-block clip-block--list"><div class=blk-series><h3 class="blk-series__title clip-block__title">The Science of Seasons</h3><ol class=blk-series__list><li class="blk-series__item "><a href="/astronomy/seasons-causes.html" class=blk-series__item-link> What Causes Seasons? </a></li><li class="blk-series__item "><a href="/astronomy/axial-tilt-obliquity.html" class=blk-series__item-link> Earth's Axis Is Tilted </a></li><li class="blk-series__item "><a href="/calendar/aboutseasons.html" class=blk-series__item-link> When Do Seasons Start and End? </a></li><li class="blk-series__item "><a href="/astronomy/solar-analemma.html" class=blk-series__item-link> What Is a Solar Analemma? </a></li></ol></div></div><div class="clip-block clip-block--picker"><h3 class=clip-block__title><a href="/calendar/seasons.html">Astronomical Season Calculator</a></h3><form name=sb_sc method=get action="/calendar/seasons.html" class=picker-city><input class=picker-city__input placeholder="Search for city or place..." autocomplete=off onfocus="ifc(this,'ci',1,14)" name=query id=wcquery type=text><button type=submit class=picker-city__button title=Search><i class="i-font i-search"></i></button></form></div><div class="clip-block clip-block--list"><div class=blk-series><h3 class="blk-series__title clip-block__title">Seasons</h3><ol class=blk-series__list><li class="blk-series__item "><a href="/calendar/spring-equinox.html" class=blk-series__item-link> When Does Spring Start? </a></li><li class="blk-series__item active"> When Does Summer Start? </li><li class="blk-series__item "><a href="/calendar/autumnal-equinox.html" class=blk-series__item-link> When Does Fall Start? </a></li><li class="blk-series__item "><a href="/calendar/winter-solstice.html" class=blk-series__item-link> When Does Winter Start? </a></li></ol></div></div><div class="clip-block clip-block--list"><div class=blk-series><h3 class="blk-series__title clip-block__title">Equinoxes & Solstices</h3><ol class=blk-series__list><li class="blk-series__item "><a href="/astronomy/equinox-solstice.html" class=blk-series__item-link> What Are Equinoxes and Solstices? </a></li><li class="blk-series__item "><a href="/calendar/march-equinox.html" class=blk-series__item-link> March Equinox </a></li><li class="blk-series__item "><a href="/calendar/june-solstice.html" class=blk-series__item-link> June Solstice </a></li><li class="blk-series__item "><a href="/calendar/september-equinox.html" class=blk-series__item-link> September Equinox </a></li><li class="blk-series__item "><a href="/calendar/december-solstice.html" class=blk-series__item-link> December Solstice </a></li><li class="blk-series__item "><a href="/astronomy/equinox-not-equal.html" class=blk-series__item-link> Equinox: Day & Night Not Equal </a></li><li class="blk-series__item "><a href="/astronomy/equilux.html" class=blk-series__item-link> Equilux: When Day & Night Are (Actually) Equal </a></li></ol></div></div></aside><aside class="layout-grid__sky layout-grid__sky--sticky article__sky"><fieldset id=ad1><legend>Advertising</legend><div id='div-gpt-com-300x600'><script> AdMgr.dispSlot(0); </script> </div></fieldset></aside></main><aside id=rel-posts class=rel-posts><div class="pdflexi fixed"><h2 class=rel-posts__title>Elsewhere on timeanddate.com</h2><div class=layout-cards> <article class=card> <a href="/news/calendar/global-thanksgiving" class="card__link" aria-label="Thanksgiving Around the World "> <div class="card__img-wrap"> <img src="https://c.tadst.com/gfx/300x168/thanksgiving-parade.jpg?1" width=300 height=168 alt="Thanksgiving Around the World " class=card__img loading=lazy> </div> <section class=card__content> <h4 class=card__title> Thanksgiving Around the World </h4> <p class=card__text> How do other countries celebrate Thanksgiving? 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