Iceland in September
Weather, Northern Lights odds, and what's actually worth planning around this month, pulled from the same sourced data used across this site's other timing tools.
| Average high | Average low | Daylight | Northern Lights |
|---|---|---|---|
| 46–50°F (8–10°C) | ~42–44°F (6–7°C) | ~12–13 hrs | Yes |
Same sourced figures as Iceland Weather by Month and Northern Lights Viewing Odds by Month. Rates last reviewed: August 20, 2026.
What's worth planning around in September
- Darkness returns properly this month, making it the first fully reliable Northern Lights month since March.
- Most F-roads are still open early in the month but begin closing by mid-September, a narrowing window for Highland access.
- Noticeably fewer crowds than peak summer, with milder weather than the deep autumn months.
- Réttir, the centuries-old sheep round-up, takes place throughout the month as farmers herd free-ranging sheep down from the highlands, traditionally followed by a celebration called a réttaball.
- The Reykjavík International Film Festival (RIFF) typically runs in the second half of September into early October, showcasing independent cinema from around the world.
F-road status in September
Still open early in the month; most routes begin closing by mid-September. See Iceland F-Roads Explained for the full picture and where to check live status, and Do You Need a 4x4? if you're deciding on a vehicle.
Packing for September
Layer for a wide daily temperature swing and pack a swimsuit regardless of the season, geothermal pools run year-round. See Iceland Packing Regrets for what real travelers wish they'd packed.
Sources
- Weather and daylight figures: same source set as Iceland Weather by Month
- Northern Lights viewing status: same source set as Northern Lights Viewing Odds by Month
- F-road status: same source set as Iceland F-Roads Explained
- Guide to Iceland, "The Top 30 Festivals in Iceland", July 2026
- What's On in Reykjavík, "Music Festivals in Iceland 2026: The Full Calendar"
- Rick Steves' Europe, "Holidays and Festivals in Iceland 2026–2027"
- Guide to Iceland, "The Old Icelandic Calendar: Months, Seasons, and Traditions", July 2026
- Iceland Review, "The Icelandic Culture: An Insight into Holidays and Customs"
- Lava Car Rental, "Top 13 Annual Icelandic Traditions and 2026 Dates", January 2026
- What's On in Reykjavík, "An Introduction to Iceland's Customs and Traditions"
- Wikipedia, "First day of summer (Iceland)" (2026 date confirmation)
- Icerental4x4, "Iceland Festivals and Events" 2026 guide (Laugavegur Ultra Marathon)
- What's On in Reykjavík, "Guide to Verslunarmannahelgi and Þjóðhátíð 2026" (Goslok)
Frequently asked questions
What's the weather like in Iceland in September?
Daytime highs in September typically run 46–50°F (8–10°C), with overnight lows around ~42–44°F (6–7°C). You'll get roughly ~12–13 hrs of daylight. Bring layers either way, since Icelandic weather has a well-earned reputation for changing its mind within hours.
Can you see the Northern Lights in Iceland in September?
Yes. Darkness returns properly; a genuinely useful month. Real darkness is necessary but not sufficient, a clear sky and active solar conditions on the night itself still matter just as much.