Jökulsárlón Weather: Average Temperature and Rain by Month

In shortAt the nearest long-running weather station, winter months average around 0–1°C, with nights just below freezing, and July and August about 10–11°C, with daytime highs around 13°C. Rain and snow fall all year; autumn is the wettest season and spring the driest. Wind makes the open shore feel colder than these figures.

0.4°CJanuary average

10.6°CJuly average

199 mmOctober, wettest month

116 mmApril, driest month

Averages by month

30-year averages (1971–2000) from the Icelandic Met Office station at Fagurhólsmýri in Öræfi, the closest station to the lagoon with a long temperature record.

Month	Average	Day high	Night low	Precipitation
January	0.4°C	2.9°C	-2.3°C	161 mm
February	0.7°C	3.2°C	-1.8°C	171 mm
March	1.3°C	4.1°C	-1.3°C	152 mm
April	3.3°C	6.3°C	0.6°C	116 mm
May	6.3°C	9.4°C	3.7°C	127 mm
June	8.8°C	11.6°C	6.2°C	129 mm
July	10.6°C	13.5°C	8.0°C	115 mm
August	10.2°C	13.1°C	7.6°C	164 mm
September	7.7°C	10.5°C	5.1°C	166 mm
October	4.7°C	7.3°C	2.4°C	199 mm
November	1.9°C	4.3°C	-0.5°C	162 mm
December	0.4°C	3.0°C	-2.2°C	159 mm

What the numbers mean for a visit

Winters are milder than the latitude suggests, but wet, windy and dark; road conditions matter more than the temperature.
Summer days rarely get warm: pack a fleece and a waterproof even in July.
Autumn brings the most rain; May to July are the drier months.
Wind off the glacier and the sea makes it feel several degrees colder on the shore.

Check the forecast on the day

Averages help you pack; the forecast decides the day. The Icelandic Met Office (vedur.is) publishes forecasts and warnings, and road.is shows which roads are open. Boat tours and ice caves are cancelled when it is unsafe, with a refund or a rebooking.

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