Reykjavik Weather in December
In December, Reykjavik averages a high of 3°C (37°F) and a low of -2°C (28°F), from 55 years of daily records (1971–2026).
3°C
Average high
37°F
-2°C
Average low
28°F
12°C
Record high
54°F · December 14, 1997
-15°C
Record low
5°F · December 18, 1973
What December Is Like in Reykjavik
- December 2025 was the 3rd warmest December in 55 years of records, 3.6°C (6.5°F) above the long-run average.
- The coldest December reading, -15°C (5°F) on December 18, 1973, has not been matched in 53 years.
- December is the wettest month of the year in Reykjavik, averaging 89 mm of rain.
- December is the least predictable month in Reykjavik: daytime highs vary more from day to day and year to year than in any other month.
At least 1 mm of rain falls on 47% of December days, and the month averages 89 mm in total.
Warmest: 2002 (6.7°C)Latest: 2025 (5.9°C)10-year averageLong-run average (2.7°C)
Look Up a Day in December
See the weather in Reykjavik on any December date, year by year.
Source: NOAA GHCN-Daily, Reykjavik (1971–2026); Reykjavik (2006–2025). Averages cover 1971–2026. How we compute this