Iceland in September offers a transitional period between summer and winter. Temperatures typically range from 4C to 10C (39F to 50F), with cooler nights. Expect a mix of sunshine, rain, and wind, and possibly the first snowfalls in the highlands. This variability contributes to dynamic and scenic landscapes, with autumnal colors beginning to appear.
Visiting during this month provides several advantages. The decrease in tourist traffic compared to the peak summer months allows for a more tranquil experience. Lower prices for accommodations and tours are often available. Additionally, September offers opportunities to witness the Northern Lights as the nights grow longer and darker. Historically, this period marked the end of the summer farming season and the beginning of preparations for winter.