High season: between June and August, the temperatures in Iceland are at their warmest, reaching 77°F (25°C), Plus, you can catch the midnight sun. It’s the most stable season, but the weather still gets unpredictable.
The shoulder seasons: May, September, and early October. Winter loses its grasp in May, but it slowly catches up in September, marking the start of Northern Light spotting season.
Low season: Proper Icelandic winter lasts from mid-October to the end of April. Expect snow and heavy winds. The temperatures linger around 35°F (1°C) but dip into the low -20s (-30°C) in the highlands and northern regions. Best season for chasing the Northern Lights and avoiding the crowds.