April in Reykjavík averages a daily high of 7.2°C with nights around 1.3°C. Expect roughly 17 wet days totalling 70.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Reykjavík is June–August.
Based on REYKJAVIK, IC (1km), 1995–2024. 30 years of April data.