Time until the first day of summer

Astronomical summer in the northern hemisphere begins at the June solstice, the moment the sun reaches its highest point in the sky and the longest day of the year. The exact instant falls on 20 or 21 June depending on the year and your zone, so this countdown uses 21 June as an approximation. Meteorological summer starts on 1 June instead. South of the equator the same solstice marks the shortest day and the start of winter.

The solstice is the longest day but not the warmest part of the year, because temperatures at mid latitudes lag it by several weeks while land and sea warm up. The date matters for anything that depends on daylight, including late fixtures, overnight roadworks and outdoor events, and in northern Scandinavia and on Iceland's far northern islands the sun does not set at all for weeks around it. Midsummer is a public holiday in Sweden, Finland and several neighbouring countries, kept on the nearest weekend rather than on the solstice, and it empties those countries for a long weekend. Stonehenge draws a large gathering for the sunrise. From this point the days shorten again, which is the part people find counter-intuitive about a date they think of as the beginning of summer rather than its midpoint.

Ireland starts summer at Bealtaine on 1 May and keeps May, June and July as the season, which puts the solstice near the middle of it rather than at the start. English and Nordic naming agrees with that instinct, since a day called Midsummer cannot comfortably also be the first. The United States follows neither convention and treats the season as the stretch between the late-May and early-September holiday weekends. Forecasters in Britain and Australia both open summer on the first of a month, which in Melbourne means 1 December, six months and one hemisphere away from the London version.

The next one falls on Monday, 21 June 2027, and this page counts down to the midnight that starts it in whatever time zone your browser reports.

Stonehenge is aligned on the solstice axis: from the centre of the monument the sun rises over the Heel Stone in June and sets in the opposite direction in December, and there is a good case that the December alignment mattered more to the people who built it. The June gathering is modern, growing out of twentieth-century revivals rather than out of any continuous tradition, and English Heritage now opens the stones for it under managed access with tens of thousands attending.

Sweden and Finland put the largest holiday of their year on the nearest weekend rather than on the solstice itself. Swedish Midsommarafton is the Friday between 19 and 25 June, and the country empties for it: offices shut, the cities are deserted and transport runs a holiday timetable. Bonfires are the older northern European custom, lit on midsummer eve from Spain to Latvia, and in Latvia and Estonia the nights of Jani and Jaanipaev are public holidays in their own right. None of it is tied to the exact instant the sun turns.