The climate of Iceland's coast is subpolar oceanic. The warm North Atlantic Current ensures generally higher annual temperatures than in most places of similar latitude in the world. The winters are mild and windy while the summers are damp and cool.

The highest air temperature recorded was 30.5 °C (86.9 °F) on 22 June 1939 at Teigarhorn on the south-eastern coast. The lowest was -38 °C (-36.4 °F) on 22 January 1918 at Grímsstaðir and Möðrudalur in the northeast hinterland. The temperature records for Reykjavík are 26.2 °C (79.2 °F) on 30 July 2008, and -24.5 °C (-12.1 °F) on 21 January 1918.