Iceland in August

August is a month of two halves. The first half is high summer at maximum pressure - this is, against common belief, the busiest month of the year, ahead of July at the airport two years running - with the country's biggest holiday weekend and its biggest city festival. The second half begins returning things the summer took away: real night, the first auroras, ripe berries. The puffins hand over the cliffs, the crowds thin in the final week, and by the 31st the day is three hours shorter than it began.

Daylight: The Night Comes Back

August gives up more than three hours of daylight, and the significant change is not the length of the day but the depth of the night: early in the month the small hours are still twilight, while by the final week the sky gets properly dark for the first time since April. That is what reopens the aurora season in late August - the first displays of the season are regularly photographed over the last days of the month, and the season then runs to mid-April.

Weather And Temperature

Where these numbers come from. The Icelandic Met Office publishes 30-year normals tables for 1961-1990 only - there is no published 1991-2020 table. We computed these from the Met Office's own monthly station files across the 30 years to 2020. They are computed, not published, and we say so rather than implying an official table exists.

August is summer with the edge coming off: half a degree behind July on the mean, with the north again taking the warmer afternoons (14.8 °C against 14.1 °C). Rain picks up against June and July - 64.5 mm in Reykjavík - and the month's end can carry the first autumn-flavoured storm. Nothing about it needs winter equipment; it just stops being the driest corner of the year.

Verslunarmannahelgi: The Biggest Weekend Of The Year

Commerce Day - frídagur verslunarmanna - falls on the first Monday of August and has been a general public holiday since the mid-20th century, first held for shop workers in 1894. The long weekend in front of it is the Icelandic travel weekend: campsites fill, domestic flights and the Westman Islands ferry sell out, and much of Reykjavík empties. The famous destination is Þjóðhátíð in the Westman Islands (31 July - 3 August in 2026), which fills the Herjólfsdalur valley with stages, bonfires, white tents and the Monday-night communal singing; media estimates put attendance in the low tens of thousands, though the organisers publish no figure. The stay-in-town alternative, honestly named, is Innipúkinn - "the indoor devil". In 2027 Commerce Day falls on 2 August.

Menningarnótt: Culture Night

Reykjavík's biggest single day follows a rule worth knowing: the Saturday of the week containing 18 August, the anniversary of the city's 1786 trading charter - which puts it on 22 August in 2026. The Reykjavík Marathon runs in the morning, the centre closes to cars and fills with free concerts, open houses, and residents handing out waffles, and the night ends with fireworks over the harbour at 23:00. It is free, enormous and entirely walkable; the practical advice is to book central accommodation early and plan nothing else that day.

What Else Is On

One event to unlearn: the annual August fireworks show at Jökulsárlón, run for two decades as a search-and-rescue fundraiser, was discontinued after Vatnajökull National Park declined the permit in June 2024 on environmental grounds. The last show was held in August 2023. Many guides still list it; do not plan around it.

Puffins Leave, Berries Arrive, Auroras Return

Mid-August is the hinge of Iceland's wildlife year. Puffin chicks - pysjur - leave the nest around the middle of the month and fly out to sea, with the adults following shortly after, so the colonies empty out over the second half of the month; in the Westman Islands, children patrol the town at night rescuing lights-disoriented pysjur and releasing them by the shore. If puffins matter to your trip, come in the first half of August at the latest.

The same mid-month line marks the berry harvest: crowberries and bilberries are fully ripe from mid-August, and picking them for on-the-spot eating is a legal right - on public land outright, and on private land for what you eat where you stand, under article 27 of the Nature Conservation Act. Réttir, the September sheep round-ups, have not started yet; at most a handful fall on the very last weekend of August. And the highland roads stay open all month - seasonal closures typically begin from mid-September - which makes late August the connoisseur's highland window: full access, thinning crowds, and a real chance of an aurora over the hut.

How Busy Is It?

The busiest of the year, by count rather than by reputation. Icelandic Tourist Board figures show 312,964 foreign departures through Keflavík in August 2025 - the year's peak, ahead of July's 302,057 - and August led July in 2024 as well (281,450 against 276,621). Within the month the pressure is front-loaded: the first half carries the holiday weekend and the deepest crowds, and the final week eases noticeably as school terms resume abroad. If you want August weather without peak August, aim late.

Related Guides

Compare with July, warmer and all midnight sun, and September, when the aurora season opens properly and the highlands close. The when to visit hub compares all twelve months. A late-August evening soak while watching for the season's first aurora is the argument for hot springs made flesh.

Frequently Asked Questions

Is August The Busiest Month In Iceland?

Yes - and this surprises people who assume July. Icelandic Tourist Board counts show 312,964 foreign departures through Keflavík in August 2025, the highest of any month, against 302,057 in July; August was also ahead in 2024. Book accommodation and capacity-limited tours months ahead. The one relief is that crowds thin noticeably in the final week as school terms resume abroad.

Can You See The Northern Lights In Iceland In August?

From the last week of August, yes - that is when the aurora season opens. Real darkness returns as the sun sets before 21:00, and the first displays of the season are regularly photographed in late August. Do not book an August trip primarily for auroras: the dark window is short and the odds rise every week into September. But a clear night at the very end of the month is a genuine chance.

When Do Puffins Leave Iceland?

From mid-August. The chicks, called pysjur, leave the nest around the middle of the month and fly out to sea, and the adults follow shortly after, so colonies empty out over the second half of August. In the Westman Islands the fledging season is a local institution: children patrol the town at night rescuing pysjur that got disoriented by the lights and release them by the shore. By September the cliffs are empty.

What Is Verslunarmannahelgi?

The August long weekend - Commerce Day, the first Monday of August, has been a general public holiday since the mid-20th century, and the weekend before it is the biggest travel weekend of the Icelandic year. Icelanders decamp to festivals and summerhouses; the famous festival is Þjóðhátíð in the Westman Islands, which fills Herjólfsdalur valley with music, bonfires and communal singing. Book ferries, flights and accommodation for that weekend far ahead, and expect Sunday-level opening hours on the Monday.

What Is Menningarnótt?

Reykjavík's Culture Night - the city's single biggest event, held on the Saturday of the week containing 18 August, the anniversary of the city's 1786 trading charter. In 2026 that is 22 August. The Reykjavík Marathon runs in the morning, the centre fills with free concerts, open houses, waffles and street events through the afternoon and evening, and fireworks close the night at 23:00.

Do The Highlands Close In August?

No. The F-road network stays open through August in a normal year; seasonal closures typically begin from mid-September as the first snow arrives, per the official travel-safety service. The trekking-hut season likewise runs to about mid-September. August is the last full month for highland plans - and late August adds the bonus of possible auroras from a highland hut.

Sources

Temperature and precipitation computed from Veðurstofa Íslands monthly station data for Reykjavík and Akureyri, 1991-2020 (read 9 August 2026). Daylight computed with the NOAA sunrise and sunset algorithm. Event dates from the organisers: the City of Reykjavík and the Reykjavík Marathon (which states the 18-August rule), Þjóðhátíð, Hinsegin dagar and Jazzhátíð Reykjavíkur; the Jökulsárlón fireworks decision from Vatnajökull National Park. Puffin fledging from Vísindavefurinn; berry ripening from Leiðbeiningastöð heimilanna and the picking right from lög nr. 60/2013; réttir dates from Bændablaðið's réttir list; highland season from Safetravel; visitor numbers from Ferðamálastofa (read 9 August 2026). Where 2027 dates are not yet published we give the rule and say so.

Last updated: 2026-08-14 · Reviewed against official sources.