September · Iceland
Best time to visit Blue Lagoon in September Weather, crowds & prices
Weather in Blue Lagoon in September
Average temperature 8°C, 106 mm of rain, about 0 days with 6+ hours of sunshine and 85% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
5.0/10
Ranked #6 of 12 months
- Avg temp
- 8°C
- Rainfall
- 106 mm
- Humidity
- 85%
- Days with 6h+ sun
- 0
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Blue Lagoon scores 5.0/10 for nature and wildlife travel - an above-average month (#6 of 12). Expect around 8°C, 106 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Milky geothermal waters in a black lava field, striking year-round against cool Icelandic air.
September in Blue Lagoon: mixed conditions, plan around the weather
Expect 8°C (47°F) in September. A good month for city streets, viewpoints and long meals; leave swimming for another season.
106 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 5/10 on the same scale — 6th of 12 months, versus 7.7/10 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, footwear you can get muddy.
Budget for mid-season pricing, and crowds are moderate.
If your dates are flexible, July is materially better in Blue Lagoon — 2.7 points higher on the same scale.
Frequently asked
- What is the weather like in Blue Lagoon in September?
- In September, Blue Lagoon averages 8°C, 106 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 5.0/10.
- Is September a good time to visit Blue Lagoon?
- September earns a 5.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Blue Lagoon in September?
- Expect about 106 mm of rain in September. Average humidity is 85% and there are about 0 days with 6+ hours of sunshine.
Curated in Blue Lagoon
Tickets & experiences
Things to do in Blue Lagoon
Blue Lagoon, Iceland. Live activities and tours from GetYourGuide, matched to this destination.