Reykjavik Weather in May
In May, Reykjavik averages a high of 10°C (49°F) and a low of 4°C (39°F), from 56 years of daily records (1971–2026).
10°C
Average high
49°F
4°C
Average low
39°F
20°C
Record high
69°F · May 18, 2025
-8°C
Record low
18°F · May 5, 1982
What May Is Like in Reykjavik
- Reykjavik's hottest May day on record is a recent one: 20°C (69°F) on May 18, 2025.
- 5 of the 10 warmest Mays on record in Reykjavik have come since 2012.
- The coldest May reading, -8°C (18°F) on May 5, 1982, has not been matched in 44 years.
- On average, 3 nights in May drop below freezing.
At least 1 mm of rain falls on 33% of May days, and the month averages 48 mm in total.
Warmest: 2025 (12.0°C)Latest: 2026 (9.6°C)10-year averageLong-run average (9.6°C)
Look Up a Day in May
See the weather in Reykjavik on any May date, year by year.
Source: NOAA GHCN-Daily, Reykjavik (1971–2026); Reykjavik (2006–2025). Averages cover 1971–2026. How we compute this