Þingvallavatn
Lake Iceland's largest natural lake within Þingvellir National Park
Iceland’s largest natural lake sits within Þingvellir National Park, part of the Mid‑Atlantic rift. Visitors come for fishable waters, rift‑valley geology, hiking and easy access from Reykjavík to the park’s trails and viewpoints.
Þingvallavatn is the largest natural lake in Iceland and lies within Þingvellir National Park in southwestern Iceland. The lake is set in a rift valley where the North American and Eurasian tectonic plates diverge, creating striking fissures and cliffs along its shores.
The lake and surrounding park are visited for geological scenery, birdlife and freshwater fishing; the area is also historically significant because the medieval Icelandic parliament Alþingi met on the adjacent rift-cliffs from the 10th century.
Þingvallavatn sits within the protected landscape of Þingvellir, which combines geological features, cultural history and recreational access in a compact area roughly within easy driving distance of Reykjavík.
- Largest natural lake: Iceland's largest natural lake, notable for clear water, trout fisheries and its position within a tectonic rift landscape.
How to Get to Þingvallavatn #
Þingvallavatn (the lake in Þingvellir National Park) is reached from Reykjavík by car via Route 1 and then Route 36 (Þingvallavegur) into the park. The drive from Reykjavík is roughly 40-50 minutes (about 45 km) depending on traffic. There is parking at Þingvellir and short walking trails to the lake shore.
Numerous Golden Circle day buses and scheduled coaches from Reykjavík also stop at Þingvellir/Þingvallavatn.
Tips for Visiting Þingvallavatn #
- Go at dawn or late evening to catch the best light for reflections and to avoid the peak tour-bus hours that hit Þingvellir during midday.
- Park at the official Þingvellir visitor centre and follow the marked shoreline trails north of the car park for quieter stretches of the lake and better photo opportunities away from the main viewpoints.
- If you're interested in snorkeling or diving the Silfra fissure, book a licensed tour well in advance-those slots are limited and often sold out on the same day.
Best Time to Visit Þingvallavatn #
Visit Þingvallavatn and the surrounding park in summer for the mildest conditions and longest daylight, or in shoulder seasons for fewer visitors.
Weather & Climate near Þingvallavatn #
Þingvallavatn's climate is classified as Subarctic - Subarctic climate with cool summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -3°C to 12°C. Abundant rainfall (1121 mm/year), wettest in February, distributed fairly evenly throughout the year.
January
January is the coldest month with highs of 2°C and lows of -3°C. Significant rainfall (105 mm), mostly overcast skies, and breezy conditions.
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February
February is cold with highs of 2°C and lows of -2°C. The wettest month with heavy rain (111 mm), mostly overcast skies, and breezy conditions.
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March
March is cold with highs of 2°C and lows of -2°C. Significant rainfall (110 mm), mostly overcast skies, and breezy conditions.
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April
April is cold with highs of 4°C and lows of 0°C. Moderate rainfall (74 mm), mostly overcast skies, and breezy conditions.
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May
May is cold with highs of 8°C and lows of 3°C. Moderate rainfall (70 mm) and mostly overcast skies.
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June
June is cold with highs of 10°C and lows of 6°C. Moderate rainfall (69 mm) and mostly overcast skies.
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July
July is cool with highs of 12°C and lows of 8°C. Moderate rainfall (74 mm) and mostly overcast skies.
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August
August is cool with highs of 12°C and lows of 8°C. Regular rainfall (99 mm) and mostly overcast skies.
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September
September is cold with highs of 10°C and lows of 6°C. Regular rainfall (90 mm) and mostly overcast skies.
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October
October is cold with highs of 6°C and lows of 3°C. Significant rainfall (107 mm) and mostly overcast skies.
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November
November is cold with highs of 4°C and lows of 0°C. Significant rainfall (101 mm), mostly overcast skies, and breezy conditions.
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December
December is cold with highs of 3°C and lows of -2°C. The wettest month with heavy rain (111 mm), mostly overcast skies, and breezy conditions.
