Early autumn · Weather & things to do
Mývatn in September
The year's rain peaks now, with about 4.2 in (106 mm) falling in Mývatn, alongside highs near 43°F (6°C) and lows of 35°F (2°C).
Our comfort score puts it mid-table at 40/100, 5th of 12.
- Avg high
- 43°F (6°C)
- Avg low
- 35°F (2°C)
- Rain
- 4.2 in (106 mm)
- Humidity
- 92%
- Cloud cover
- 82%
- Daylight
- ~12 h 39 min
- Comfort score
- 40/100 · Tough
What September feels like
It's cool, with highs near 43°F (6°C), so a proper jacket stays on most of the day.
Nights cool to an average low of 35°F (2°C).
Some rain is likely, about 4.2 in (106 mm) in the month, so pack for a shower or two.
Skies are often grey, with average cloud cover around 82%.
Plan around September
September sits mid-table; the best months are June – August.
- Start of the wettest three-month stretch (September – November), which brings about 12.2 in (311 mm) in total.
- Comfort slips from 51/100 in August to 40/100.
- September sits inside the Jun – Sep window our Iceland Ring Road route recommends.
What to pack for September
- Insulated jackethighs only 43°F
- Packable rain jacket or umbrellaabout 4.2 in of rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Mývatn in September
A mixed month: these picks balance outdoor stops with indoor fallbacks.
Daddi's Pizza
Simple Reykjahlíð pizzeria popular with campers.
Why now A warm sit-down stop when highs sit around 43°F.
Dimmuborgir
Lava field of towers and arches with marked trails.
Goðafoss
Horseshoe-shaped falls on the Skjálfandafljót river.
Vogafjós Farm Resort
Café in a working cowshed serving geyser bread and smoked trout.
Why now Somewhere to warm up between colder walks.
Grjótagjá
Small lava cave with a geothermal pool seen in 'Game of Thrones'.
Nearby in September
- Jökulsárlón in September~108 mi · highs 46°F, 8.7 in rain · 2°C (3°F) warmer by day, wetter
- Vík in September~162 mi · highs 50°F, 9.0 in rain · 4°C (7°F) warmer by day, wetter
- Reykjavík in September~177 mi · highs 51°F, 7.1 in rain · 4°C (7°F) warmer by day, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~487 m to Mývatn's ~276 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Mývatn in September: quick answers
Is September a good time to visit Mývatn?
It's middling, scoring 40/100. The best months are June – August, at up to 53. Expect highs of 43°F (6°C) and 4.2 in (106 mm) of rain. September is inside the Jun – Sep window our Iceland Ring Road route recommends.
How cold is Mývatn in September?
Average highs are 43°F (6°C) and average lows 35°F (2°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Mývatn in September?
Some: about 4.2 in (106 mm) of rain falls across September on average, the wettest month of the year. The annual total is about 39.0 in (991 mm).
What should I pack for Mývatn in September?
Bring insulated jacket (highs only 43°F), packable rain jacket or umbrella (about 4.2 in of rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
Routes in season in September
- Iceland Ring Road Jun – Sep
Planning Mývatn in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.