The best months to visit Iceland are July and June. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Iceland: January 1°C / 134mm; February 1°C / 134mm; March 2°C / 121mm; April 6°C / 101mm; May 9°C / 90mm; June 13°C / 75mm; July 15°C / 83mm; August 14°C / 97mm; September 10°C / 129mm; October 6°C / 118mm; November 3°C / 118mm; December 1°C / 133mm.