Iceland Weather In August 2025. Autumn in iceland, from late august to early november, is a great time to visit. In august in iceland, the average air temperature ranges from 13 °c (56 °f) during the day to 8 °c (46 °f) at night.
Autumn in iceland, from late august to early november, is a great time to visit. There are 9 days of rain on average, where the rainfall is 73 mm (2.87 in).
