Seyðisfjörður Weather in September
During September, Seyðisfjörður experiences low daytime temperatures of 11°C (52°F) and cooler nights around 4°C (39°F). Expect quite a bit of rainfall. Around 120 mm (4.7 in) is typical.
Rainfall in Seyðisfjörður in September
You can expect rain on around 17 days based on historical patterns, with 120 mm (4.7 in) average for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Seyðisfjörður in September
If you're visiting Seyðisfjörður in September, expect highs of 11°C (52°F) and overnight lows around 4°C (39°F). Even at the warmest part of the day, temperatures stay low. Dressing warmly from the start is the sensible approach. Nights fall to 4°C (39°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.September in Seyðisfjörður has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Seyðisfjörður's climate page.
Seyðisfjörður Temperature in September
Min Temperature
4°C (39°F)
Max Temperature
11°C (52°F)
Chance of Rain
56%
Precipitation
120 mm (4.7 in)
Rainy days
17 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Seyðisfjörður typically drop from around 12°C (54°F) at the start of September to approximately 9°C (48°F) by the end. Nights are cold, with lows typically ranging from 3°C (37°F) to 7°C (45°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Seyðisfjörður in September
Browse day-by-day weather records for Seyðisfjörður spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Seyðisfjörður historical weather extremes in September
Our historical data for Seyðisfjörður spans 1976 to 2025, revealing these weather extremes.
- On September 1, 2017, temperatures climbed to 24°C (75°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 2°C (36°F), recorded on September 20, 1990.
- Nighttime temperatures dropped to -4°C (25°F) on September 29, 2009, marking the coldest September night on record.
Best Places in Iceland in September
Find out more about the weather in Iceland and which places have the best travel conditions in this month. See all of Iceland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Seyðisfjörður in September
The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags.What To Do in Seyðisfjörður in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Seyðisfjörður's climate page.
See the full Seyðisfjörður climate overview or explore weather in Iceland.
