The short answer
Jökulsárlón can be visited year-round, but its boat tours are seasonal: the amphibian boat and the Zodiac run from May to October, and the amphibian often continues into mid-November when conditions allow. In winter, guided tours into natural ice caves start from the lagoon instead, so choose your season by the tour you want.
For a first visit centered on the boat tours, June offers the best overall balance. The boats run their longer summer hours, there are close to 21 hours of daylight, and there are fewer visitors to Iceland than in July or August. May is a close second: drier, with fewer visitors to Iceland, but shorter boat hours.
For the blue ice caves, come between November and March, the core cave season; some tours start in October or continue into April when conditions allow. There are far fewer visitors to Iceland from December to February than in summer; the days are shortest in December and lengthen through February.
In September and October the boat tours still run and the nights are dark again, so the northern lights are possible on a clear night. September has about 13 hours of daylight and longer boat hours, October about 10; both are much wetter than summer.
Whatever month you visit, check the wind forecast, road conditions and tour status before setting out: tours can be cancelled for safety, and winter storms can temporarily close or restrict Route 1. From November to February, aim to be at the lagoon around midday, while it is light.
- Lagoon boat tours:
- May to October, often into mid-November
- Best overall for a first visit:
- June
- Close second, drier but shorter boat hours:
- May
- Natural ice cave tours:
- November to March
- Boat tours and dark nights:
- September and October, but much wetter
- Far fewer visitors to Iceland:
- December to February, but short days
- Live checks on the day:
- Wind · rain · road status · tour status
- 20h 57m of daylight in mid-June
- 4h 17m of daylight in mid-December
- 116 mm of rain in May near the lagoon, the driest month
- 287 mm of rain in October near the lagoon, the wettest
Check dates for a lagoon day trip
This calendar is for the Jökulsárlón and Diamond Beach day trip from Reykjavík, which runs in every season and does not depend on the boat tours or the ice caves.
Which tours run on your date?
Pick a date to see which tours are in season, the café hours, sunrise and sunset, and the weather. Dates in the next two weeks use the live forecast; later dates use the monthly averages for the lagoon, and the card says which.
What runs through the year
- Boat tours:
- Amphibian boat May to October, often into mid-November; Zodiac May to October
- Ice cave tours:
- Usually October to March; some tours into April when conditions allow
- Café at the lagoon:
- Open year-round except December 24–26 and December 31–January 2
- Daylight:
- From about 4 hours in mid-December to nearly 21 in mid-June
- Weather:
- Pick a date for the forecast or the monthly average
- Wind:
- Shown for dates inside the forecast range
- Dark night sky:
- From early September to early April only
Pick a date above to see this for your own day.
From May to October the lagoon boat tours are the main choice; from November to March it is the guided ice cave tours. Whatever the date, check the wind forecast, road conditions and tour status before setting out.
Check year-round day tripsA full day from Reykjavík to the lagoon and Diamond Beach, without the boat. Rated 4.69 from 4,057 reviews.
What each season is like at the lagoon
Icebergs float in the lagoon in every month, because the glacier above it keeps breaking off new ice, and the amount on the water changes from day to day with the weather, the tides and the currents. The season changes what you can book, how much light you have and what lives around the shore.
May and June: the boat season opens
The amphibian boats and the Zodiacs start running in early May, conditions allowing. Arctic terns arrive from the South Atlantic in late April and May and nest on the flat ground beside the lagoon through June and July; walk near a colony and they may dive at your head. Days are already long in May, at about 18 hours of daylight, and by mid-June the sun is up for nearly 21. The sky never gets fully dark from about April 11 to September 2, so evenings at the lagoon stay light.
July and August: the busiest weeks
This is when the boat operator runs its fullest timetable, with about 40 amphibian trips a day, and when the most visitors travel to Iceland. Harbor seals molt in late summer and haul out on the ice to do it, which is why the national seal census is flown from late July to late August; the boat operator says seals are frequently seen resting on the icebergs, though no count exists for this lagoon. The terns leave by the end of August.
September and October: boats with darker evenings
Both boats keep running, the Zodiac until the end of October, and full darkness returns at the start of September: about four and a half hours of it by mid-September and nearly nine by mid-October. That makes these the months when a boat trip and a dark sky fit into one visit, with a chance of the northern lights on a clear night. They are also among the wettest months of the year here, with more than twice May’s rain.
November: the changeover
The amphibian boat often keeps going into mid-November when the lagoon allows, while the ice cave tours start once guides judge the caves safe. Days are down to about six and a half hours by mid-month.
December to March: the ice cave season
Natural ice caves open up inside Breiðamerkurjökull, the glacier above the lagoon, each winter. They are different every year, and guides choose which cave to visit on the day for conditions and safety. Daylight runs from about four hours in mid-December to nearly twelve by mid-March. The winter sun stays low all day, only a few degrees above the horizon at noon in December, so it lights the ice on Diamond Beach from the side.
April: between seasons
Some ice cave tours continue into April when conditions allow, and the boats have not started yet. The lagoon, the shore walk and Diamond Beach are there as in every month, with about 15 hours of daylight by mid-April.
More tours around Jökulsárlón and the South Coast
Glacier hikes from Skaftafell, Katla ice cave trips from Vík, South Coast day trips from Reykjavík past Seljalandsfoss and Skógafoss, and boat trips on Fjallsárlón, the smaller lagoon just to the west.
Jökulsárlón month by month
Rain is the monthly total at the nearest rain gauge, 10 km east of the lagoon. Highs and lows are the average daily high and low at the nearest temperature station, 32 km west on the same coast. Daylight is sunrise to sunset on the 15th. The visitor column shows foreign visitors leaving Iceland in each month against August, the busiest, so it describes Iceland, not the lagoon itself.
| Month | Boat tours | Ice cave tours | Daylight | Average high / low | Visitors to Iceland (Aug = 100) | Rain |
|---|---|---|---|---|---|---|
| January | No regular tours | Core season | 5h 24m | 3.9 / −1.9°C (39 / 29°F) | 42 | 227 mm |
| February | No regular tours | Core season | 8h 35m | 3.7 / −2.1°C (39 / 28°F) | 50 | 184 mm |
| March | No regular tours | Core season | 11h 38m | 4.4 / −1.2°C (40 / 30°F) | 55 | 177 mm |
| April | No regular tours | Some tours, conditions allowing | 15h 00m | 7.0 / 1.1°C (45 / 34°F) | 49 | 161 mm |
| May | Season starts in early May | Closed | 18h 18m | 9.8 / 3.7°C (50 / 39°F) | 54 | 116 mm |
| June | Amphibian and Zodiac | Closed | 20h 57m | 12.2 / 6.5°C (54 / 44°F) | 78 | 134 mm |
| July | Amphibian and Zodiac | Closed | 19h 45m | 13.8 / 8.3°C (57 / 47°F) | 98 | 119 mm |
| August | Amphibian and Zodiac | Closed | 16h 28m | 13.9 / 8.2°C (57 / 47°F) | 100 | 157 mm |
| September | Amphibian and Zodiac | Closed | 13h 07m | 11.4 / 5.9°C (53 / 43°F) | 76 | 277 mm |
| October | Amphibian and Zodiac | Some tours, conditions allowing | 9h 55m | 7.8 / 2.7°C (46 / 37°F) | 71 | 287 mm |
| November | Amphibian often to mid-month | Core season | 6h 36m | 5.1 / −0.1°C (41 / 32°F) | 52 | 196 mm |
| December | No regular tours | Core season | 4h 17m | 4.1 / −1.3°C (39 / 30°F) | 45 | 234 mm |
Boat dates follow the operator’s published seasons, and both boats depend on ice and weather. Ice cave dates are the core season; each operator sets its own dates within it, and Vatnajökull National Park keeps the caves closed from May to September.
Which tour fits your dates
The month settles most of this. Each option below is a well-reviewed GetYourGuide tour that fits that season, with hundreds of reviews or more behind it.
Boat season: a day trip with the boat ride included
May to October
A full day from Reykjavík with the amphibian boat ride on the lagoon built in, plus Diamond Beach and stops along the South Coast.
- Rated 4.67 from 324 reviews
- About 14 hours, which fits easily into a summer day; by October much of the drive home is in the dark
Ice cave season: a tour from the lagoon
November to March
A three-hour guided tour that starts at Jökulsárlón and drives out to a natural ice cave in the glacier. Because it starts at the lagoon, plan to stay the night nearby, for example around Höfn or Skaftafell.
- Rated 4.64 from 972 reviews
- Three hours fits inside even a short December day
Any month: the lagoon and Diamond Beach
All year
The lagoon and Diamond Beach from Reykjavík without the boat or the cave. This suits April, late November, or a trip where you would rather not depend on one seasonal tour.
- Rated 4.69 from 4,057 reviews
- About 14 hours; no boat ride included
If you drive yourself, you can buy the boat tour at the lagoon; the operator recommends buying tickets before you arrive, especially in summer. Our boat tour guide compares the amphibian and the Zodiac, and the ice cave guide covers the winter tours.
Daylight and the drive from Reykjavík
Jökulsárlón is about five hours from Reykjavík by road each way in good conditions, and the day trips that go there are listed at around 14 hours. In June that whole day fits inside daylight with hours to spare. By November there are about six and a half hours of daylight, and much of a full-day tour from Reykjavík runs in darkness, including the drive home.
- Mid-June: 20h 57m from sunrise to sunset, and the sky never gets fully dark
- Mid-September: 13h 07m
- Mid-December: 4h 17m, with the sun only a few degrees above the horizon at noon
So in winter, a cave tour that starts at the lagoon works best with a night nearby, rather than doing the whole trip from Reykjavík in one day. Jökulsárlón does not get the midnight sun: it is about 280 km south of the Arctic Circle, so the sun sets every night, even in June.
Rain and cold at the lagoon
May is the driest month, with about 116 mm of rain at the nearest gauge, and October the wettest at about 287 mm, with September close behind. That is a monthly total, not a daily rate, and it does not say how many days were wet. All five weather stations around the lagoon that we compared are much wetter in September and October than in May, so expect wetter days in the fall even though the boats are still running.
It is cold on the water in every season. Average highs near the lagoon reach about 14°C (57°F) in July and August, and the boats are open to the weather. The operator recommends warm layers, a hat, gloves and waterproof outerwear even in summer, and Zodiac passengers are given flotation suits. A wet day still works for the lagoon itself. The boat tours depend on weather and ice conditions, and the operator cancels for safety when it has to, so check the tour status on the day.
How busy Iceland is through the year
The only monthly series is national: foreign visitors leaving Iceland through Keflavík airport. Across 2023 to 2025, July and August averaged about 290,000 a month and January about 120,000, so summer brings more than twice as many people to the country. September is close to June, at about 220,000, so it is not a quiet month. May, at about 160,000, is the quietest month from May to October.
These figures describe Iceland, not the lagoon. They cannot tell you how full the car park is on a given morning, and a lagoon on the Ring Road may see a different share of the country’s visitors in winter than in summer.
Winter: ice caves, roads and short days
Regular boat tours stop for winter. The amphibian boat runs from May and often continues into mid-November, and the Zodiac runs from May to the end of October; the operator says it may run outside those dates when conditions allow. In winter the lagoon is a shore walk and a long look at the ice, with Diamond Beach just across the road and the café open every day except December 24–26 and December 31–January 2.
Around 200,000 people joined glacier hikes or ice cave tours in Vatnajökull National Park in 2024, as reported by RÚV. Since a fatal accident at Breiðamerkurjökull in 2024, the national park has kept ice caves closed from May to September, and only licensed operators with park contracts can take groups in. Glacier Trips, one of the operators that guides the caves, describes November to February as its peak season with the most stable caves, while caves are still forming in October and thinning in March and April.
Winter storms can temporarily close or restrict Route 1 along this coast, so check road conditions on umferdin.is and travel alerts on safetravel.is before driving. If you would rather not drive in winter at all, the self-drive versus guided tour comparison sets out the trade-offs.
Common questions
Can you do a boat tour on Jökulsárlón in winter?
Not on the regular schedule. The amphibian boat runs from May and often continues into mid-November when conditions allow, and the Zodiac runs from May to the end of October; the operator says it may run outside those dates if conditions allow. From late November to April the lagoon is a shore walk, Diamond Beach is just across the road, and guided ice cave tours start from the lagoon instead.
Can you see the ice caves at Jökulsárlón in summer?
No. Vatnajökull National Park keeps the natural ice caves closed from May to September, and new caves open up in the glacier each winter. If you are in Iceland in summer and want an ice cave, operators run tours to the Katla ice cave near Vík all year.
Is September or October better at Jökulsárlón?
September has more daylight, about 13 hours in mid-month against about 10 in mid-October, and both boats are running. October is the Zodiac’s last month and has longer dark nights for the northern lights. Both are among the wettest months at the lagoon, and both bring more visitors to Iceland than May does.
Can you see the northern lights at Jökulsárlón?
Mainly from early September to early April. Between about April 11 and September 2 the sky never gets fully dark, so the northern lights are very unlikely to be seen. A sighting also needs a clear sky and auroral activity on the night, so treat it as a possible bonus rather than a reason to choose a date.
Does Jökulsárlón get the midnight sun?
No, though it comes close. The lagoon is about 280 km south of the Arctic Circle, so the sun sets every night. Around the June solstice there are about 21 hours between sunrise and sunset, and the hours between stay light enough to walk the shore.
How cold is it on the boat tours?
Cold in every season. Average highs near the lagoon run from about 10°C (50°F) in May to about 14°C (57°F) in July and August, and the boats are open to the weather. The operator recommends warm layers, a hat, gloves and waterproof outerwear even in summer.
What can you do at Jökulsárlón when the boats are not running?
Walk the shore, watch the icebergs and cross the road to Diamond Beach, which you can do in any month. The café at the lagoon is open year-round except December 24–26 and December 31–January 2, and from November to March guided ice cave tours start from the lagoon.
How we know
Sources for every figure on this page
- Boat seasons and hours. The lagoon boat operator’s own pages at icelagoon.is, read on October 14, 2026: amphibian tours May to November, Zodiac tours May to the end of October, tour hours 10 a.m. to 5 p.m. in May, 9 a.m. to 7 p.m. from June to September and 10 a.m. to 5 p.m. from October to November 15, and about 40 amphibian trips a day from July 1 to August 31. The café hours and holiday closures come from the same site.
- Ice cave season. Vatnajökull National Park’s rules as reported by RÚV and the Reykjavík Grapevine in September 2025 (caves closed May to September, contracts for 30 companies), and the season descriptions published by operators who guide the caves. Dates vary by operator and by year.
- Rain. Veðurstofa Íslands, the Icelandic Meteorological Office: monthly series for Hali (station 738), about 10 km east of the lagoon, averaged over 1998 to 2016, the station’s full record inside the 1991–2020 reference period. Four other stations around the lagoon show the same shape.
- Temperature. Veðurstofa Íslands: Fagurhólsmýri (station 745), about 32 km west, averaged over 1991 to 2008, cross-checked against Höfn for 2007 to 2018.
- Daylight and darkness. Computed with the NOAA solar position algorithm for 64.048°N on the 15th of each month; accurate to a few minutes. Full darkness means the sun more than 18 degrees below the horizon; there is none between April 11 and September 2.
- Visitors. Ferðamálastofa, the Icelandic Tourist Board: foreign visitors leaving through Keflavík airport, three-year monthly mean for 2023 to 2025.
- Wildlife. The Icelandic Institute of Natural History for the Arctic tern’s timing, and the Marine and Freshwater Research Institute for the harbor seal census window.
- Tours. Ratings and review counts read live on GetYourGuide on October 14, 2026. Prices change, so this page sends price questions to the booking calendar.
Limits of these figures
- Monthly averages are not a forecast; a dry May and a wet one both happen.
- The rain and temperature stations are near the lagoon, not at it, and the glacier is colder than either.
- The visitor figures count Iceland as a whole. Nobody publishes a monthly count for the lagoon.
- No source records iceberg size or seal numbers at the lagoon month by month, so this page makes no claim about either.
- Season dates are the operators’ published plans. Ice, wind and storms can stop tours on any day.
Ready to pick a date?
Whichever month you have, the booking calendar shows what runs on it.
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