September · Iceland
Best time to visit Selfoss in September Weather, crowds & prices
Weather in Selfoss in September
Average temperature 8°C, 140 mm of rain, about 0 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.2/10
Ranked #6 of 12 months
- Avg temp
- 8°C
- Rainfall
- 140 mm
- Humidity
- 86%
- Days with 6h+ sun
- 0
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Selfoss scores 4.2/10 for sightseeing and cultural travel - an above-average month (#6 of 12). Expect around 8°C, 140 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Selfoss is South Iceland’s service town on the Ölfusá-base for Golden Circle and south-coast waterfall loops. Best window: the short high-summer window when daylight peaks.
September in Selfoss: expect compromises
Expect 8°C (46°F) in September. A good month for city streets, viewpoints and long meals; leave swimming for another season.
140 mm of rain signals a properly wet month, with only almost no days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 4.2/10 on the same scale — 6th of 12 months, versus 6.9/10 for the best month here.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, July is materially better in Selfoss — 2.7 points higher on the same scale.
Frequently asked
- What is the weather like in Selfoss in September?
- In September, Selfoss averages 8°C, 140 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 4.2/10.
- Is September a good time to visit Selfoss?
- September earns a 4.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Selfoss in September?
- Expect about 140 mm of rain in September. Average humidity is 86% and there are about 0 days with 6+ hours of sunshine.
Curated in Selfoss
Tickets & experiences
Things to do in Selfoss
Selfoss, Iceland. Live activities and tours from GetYourGuide, matched to this destination.