Best Time to Visit Iceland for Ideal Weather The summer months — July and August — are Iceland’s warmest, and have long been the most popular time to visit. And June, with its 24 hours of daylight, sees just about as many tourists as the peak of summer. But even during this season, bad weather (rain and intense winds) is not uncommon. The island’s fickle climate often means you can experience all four seasons in a single day. Iceland can stay relatively warm through the first week of October, so planning a September visit can be ideal (most of the crowds have thinned as children return to school). May, too, provides ample daylight for sightseeing and warmer temps. But if you’re keen on exploring some of the more remote hills and fjords, it may not be the best time to visit, as some roads remain closed while they thaw from winter’s snowy cover. For serious hikers, the best time to visit Iceland is the summer, when all the mountain roads are open and all the most famous trails are accessible.