September in Iceland marks the meteorological beginning of autumn. Expect transitioning conditions, with average temperatures typically ranging from 4C to 10C (39F to 50F). Decreasing daylight hours, averaging around 13 per day, lead to cooler nights and a higher likelihood of rain or occasional snow showers, particularly in the highlands. Coastal areas tend to experience milder temperatures compared to inland regions.
This period offers a unique blend of summer’s lingering warmth and the emerging beauty of autumn. The changing foliage provides stunning landscapes, while the reduced tourist crowds compared to peak season allow for a more tranquil experience. Historically, September was a crucial month for Icelandic farmers, marking the end of the harvest season and the beginning of preparations for winter. This transition continues to be celebrated culturally, connecting visitors to the land’s rich agricultural heritage. Furthermore, the longer nights increase the chances of witnessing the aurora borealis, a spectacular natural phenomenon.