Summer Solstice 2018


When is the Summer Solstice 2018?

The Summer Solstice 2018 is on Thursday, June 21, 2018 (in 242 days).  2018 Calendar
The Summer Solstice 2017 has already passed: it was on Wednesday, June 21, 2017 (123 days ago).  2017 Calendar

What is the Summer Solstice?

Sunrise over Stonehenge on the day of the summer solstice. In the Northern Hemisphere, the summer solstice marks the beginning of summer. Photo: Wikimedia CommonsSunrise over Stonehenge on the day of the summer solstice. In the Northern Hemisphere, the summer solstice marks the beginning of summer.
A summer solstice is the moment in time when the Earth's tilt towards the Sun is at its maximum and the Sun reaches its highest position in the sky.

A summer solstice occurs twice a year, once in June in the Northern Hemisphere (also called northern solstice, June solstice and Midsummer) and once in December in the Southern Hemisphere (also called the southern solstice or December solstice).

In the Northern Hemisphere the day of the summer solstice is the longest day of the year (the day with the most daylight and the shortest night) and occurs every year between June 20 and June 22. The dates given on this page are based on Coordinated Universal Time (UTC), which for practical purposes is equivalent to Greenwich Mean Time (GMT). While the summer solstice occurs at the same moment in time all over the world, the date and local time differ from place to place depending on the year and a location's time zone. For locations that are ahead of UTC (further east) it may fall on the day after, and for locations that are behind UTC (further west) it may fall on the day before. To find out the exact date and time of the summer solstice 2018 in your area use this seasons calculator.

The summer solstice marks the end of spring and the beginning of summer in the hemisphere where it occurs and is one of four days (two equinoxes and two solstices) throughout the year on which a new season starts. The other days are the vernal equinox (also called spring equinox, beginning of spring), the autumnal equinox (also called fall equinox, beginning of autumn) and the winter solstice (beginning of winter).


The exact moment of the northern summer solstice through the centuries
Summer solstice leap shifting. Graph: Wikimedia creative commons
Graph demonstrating the movement (caused by leap shifting) of the exact moment of the summer solstice between 1750 and 2250. X axis (bottom, horizontal): Calendar years, Y axis (left, vertical): day in June (20th to 23rd).

In a non-leap year, the moment of the summer solstice is about 5 hours 49 minutes after that moment in the previous year (in UTC), and in a leap year it is about 18 hours 11 minutes before that moment in the previous year, as can be seen in this graph. In this way the time of the summer solstice constantly shifts back and forth so it always stays around June 20 to 22. This four year cycle is clearly visible in the graph.

To adjust for the gradual movement backwards on the calendar (as visible for the period 1900 to 2099), in years divisible by 100 (1800, 1900, 2100 and 2200 on the graph), which should be leap years as they are divisible by 4, the leap day is omitted (except when they are divisible by 400, eg. 2000) and the moment of the summer solstice moves forward in time compared to the same moment in the year before.


For more information see Summer solstice on Wikipedia.

When is the Summer Solstice 2019?

The Summer Solstice 2019 is on Friday, June 21, 2019 (in 607 days).  2019 Calendar

Dates for the Summer Solstice from 2010 to 2025

The next occurrence of the Summer Solstice is marked in red.

When is ...? Date      Day of the week      Days away     
Summer Solstice 2010      June 21, 2010      Monday      2680 days ago
Summer Solstice 2011      June 21, 2011      Tuesday      2315 days ago
Summer Solstice 2012      June 20, 2012      Wednesday      1950 days ago
Summer Solstice 2013      June 21, 2013      Friday      1584 days ago
Summer Solstice 2014      June 21, 2014      Saturday      1219 days ago
Summer Solstice 2015      June 21, 2015      Sunday      854 days ago
Summer Solstice 2016      June 20, 2016      Monday      489 days ago
Summer Solstice 2017      June 21, 2017      Wednesday      123 days ago
Summer Solstice 2018      June 21, 2018      Thursday      in 242 days
Summer Solstice 2019      June 21, 2019      Friday      in 607 days
Summer Solstice 2020      June 20, 2020      Saturday      in 972 days
Summer Solstice 2021      June 21, 2021      Monday      in 1338 days
Summer Solstice 2022      June 21, 2022      Tuesday      in 1703 days
Summer Solstice 2023      June 21, 2023      Wednesday      in 2068 days
Summer Solstice 2024      June 20, 2024      Thursday      in 2433 days
Summer Solstice 2025      June 21, 2025      Saturday      in 2799 days
Data provided 'as is' without warranty

Summer Solstice 2018 Dates of the Summer Solstice 2018 and surrounding years
as downloadable image file




Dates of other holidays, events and celebrations

Christian (and related)
Advent
Advent Sunday
All Saints' Day
All Souls' Day
Ascension Day
Ash Wednesday
Black Saturday
Boxing Day
Bright Saturday
Bright Week
Candlemas
Christmas
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Easter Day
Easter Eve
Easter Friday
Easter Monday
Easter Saturday
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Eastertide
Easter Week
Easter Weekend
Epiphany
Epiphany Eve
Fat Tuesday
First day of Lent
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Holy Friday
Holy Saturday
Holy Thursday
Holy Week
Jesus' Birthday
Lazarus Saturday
Lent
Mardi Gras
Maundy Thursday
Orthodox Easter
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Pascha
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Pentecost Sunday
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St. Andrew's Day
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Theophany
Three Kings Day
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Twelve Days of Christmas
Twelfth Night
Whit Sunday
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US federal holidays
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Martin Luther King Day
Presidents' Day
    (Washington's Birthday)
Memorial Day
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Labor Day
Columbus Day
Veterans Day
Thanksgiving Day
Christmas Day

Australian holidays
ANZAC Day

The seasons
Spring
Vernal equinox (spring equinox,
March Equinox)
Summer
Summer solstice (June solstice)
Autumn / Fall
Autumnal equinox (fall equinox,
September equinox)
Winter
Winter solstice (December solstice)

Other days
April Fools Day
Armed Forces Day
Cinco de Mayo
Constitution Day
Daylight Saving Time
Day of the Dead
Día de los Muertos
Earth Day
Father's Day
Flag Day
Halloween
Indigenous Peoples' Day
International Women's Day
Mother's Day
Native American Day
New Year's Day
New Year's Eve
Star Wars Day
Samhain
Summer Time
Teacher Appreciation Day
Teacher Appreciation Week
Valentine's Day
World Environment Day
World Teachers' Day

... and more coming!

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