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July is the hottest month in Reykjavik, with an average high of 15°C / 59°F; January is the coldest (3°C / 38°F). December is the wettest month, averaging 99 mm / 3.9 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | 3 / 38 | -2 / 29 | 84 / 3.3 | 15 |
| Feb | 3 / 38 | -2 / 28 | 89 / 3.5 | 15 |
| Mar | 4 / 40 | -1 / 30 | 83 / 3.3 | 15 |
| Apr | 7 / 44 | 1 / 34 | 54 / 2.1 | 11 |
| May | 10 / 50 | 4 / 39 | 49 / 1.9 | 10 |
| Jun | 13 / 55 | 7 / 45 | 42 / 1.7 | 9 |
| Jul | 15 / 59 | 9 / 48 | 50 / 2.0 | 10 |
| Aug | 14 / 57 | 9 / 47 | 66 / 2.6 | 12 |
| Sep | 11 / 53 | 6 / 43 | 85 / 3.3 | 15 |
| Oct | 8 / 46 | 3 / 37 | 81 / 3.2 | 13 |
| Nov | 5 / 40 | 0 / 32 | 86 / 3.4 | 14 |
| Dec | 3 / 38 | -2 / 29 | 99 / 3.9 | 15 |
Extremes since 1941: highest 26°C / 78°F (July 30, 2008), lowest -30°C / -23°F (May 19, 2025).
Daylight lasts about 20.5 hours in June and 3.5 hours in December.
Data: Meteostat — Reykjavik, 1991–2020 averages.
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