Grímsey Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grímsey.
Climate overview of Grímsey
Grímsey, located off the northern coast of Iceland, is known for being the only part of the country that crosses the Arctic Circle. The island has a cool maritime climate with moderate seasonal changes. Summers are generally cold, and winters remain cold as well, with temperatures rarely becoming extreme. Precipitation levels are moderate throughout the year. Let’s explore the climate details to give you a complete picture.
Grímsey Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grímsey - and find the best time to visit.
Monthly Temperature in Grímsey
The weather in Grímsey changes moderately throughout the year, offering enough variation to appreciate each season. Average maximum daytime temperatures range from a chilly 11°C (52°F) in August, the warmest time of the year, to a chilly 3°C (37°F) during cooler months like March.
At night, you can expect temperatures ranging from 8°C (46°F) in August to around -1°C (30°F) during March.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grímsey
Generally, Grímsey receives mid-range precipitation levels, with 960 mm (38 in) annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, October it receives high rainfall, averaging 109 mm (4.3 in) of precipitation, recorded across 18 rainy days. In contrast, the driest month June brings less rainfall, with 41 mm (1.6 in) over 13 rainy days. For more details, please visit our Grímsey Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Grímsey
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: August
- Warmest weather: July, August and September
- Fewer rainy days: February, April, May, June and July
- Coldest conditions: March, with freezing nights around -1°C (30°F).
Frequently asked questions about the climate in Grímsey
What is the best time to visit Grímsey?
August typically offers the most optimal weather in Grímsey. In contrast, January, February, March, April, May, June, July, September, October, November and December tend to have less optimal conditions.
What temperatures can I expect in Grímsey?
Daytime highs range from 3°C (37°F) in March to 11°C (52°F) in August. Nighttime lows range from -1°C (30°F) to 8°C (46°F).
How much rain does Grímsey get?
Annual rainfall is around 960 mm (38 in). October is the wettest month with 109 mm (4.3 in), while June is the driest with 41 mm (1.6 in).
Grímsey 3-Day Forecast
Grímsey on the map
Grímsey is highlighted - select any city to see its climate.
Popular this month
Where to go in September - average daytime high across popular destinations.
Reykjavík
12°C (54°F) Kópavogur12°C (54°F) Hella
13°C (55°F) Selfoss12°C (54°F) Keflavík12°C (54°F) Höfn10°C (50°F) Egilsstadir
10°C (50°F) Akureyri9°C (48°F) 
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