September · Iceland
Best time to visit Mývatn in September Weather, crowds & prices
Weather in Mývatn in September
Average temperature 2°C, 95 mm of rain, about 0 days with 6+ hours of sunshine and 91% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
3.9/10
Ranked #6 of 12 months
- Avg temp
- 2°C
- Rainfall
- 95 mm
- Humidity
- 91%
- Days with 6h+ sun
- 0
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Mývatn scores 3.9/10 for nature and wildlife travel - an above-average month (#6 of 12). Expect around 2°C, 95 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Lake Mývatn is North Iceland’s volcanic wonderland-pseudocraters, lava labyrinths, and steaming geothermal baths. Best window: the short high-summer window when daylight peaks.
September in Mývatn — off-season conditions
At 2°C (36°F) this is proper winter weather in September: layer up and split the day between outdoor highlights and indoor stops.
Budget for roughly 95 mm of rain this month — a flexible day or two helps — with almost no days with 6+ hours of sunshine and 12.7 hours of daylight to work around it.
That is 3.9/10 on the same scale — 6th of 12 months, versus 7.1/10 for the best month here.
Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer, footwear you can get muddy.
Budget for low-season pricing, and crowds are light for this destination. That combination — decent conditions at the lowest rates of the year — is the best value window on this page.
If your dates are flexible, June is materially better in Mývatn — 3.2 points higher on the same scale.
Frequently asked
- What is the weather like in Mývatn in September?
- In September, Mývatn averages 2°C, 95 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 3.9/10.
- Is September a good time to visit Mývatn?
- September earns a 3.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Mývatn in September?
- Expect about 95 mm of rain in September. Average humidity is 91% and there are about 0 days with 6+ hours of sunshine.
Curated in Mývatn
Tickets & experiences
Things to do in Mývatn
Mývatn, Iceland. Live activities and tours from GetYourGuide, matched to this destination.