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On its way to its 20th edition in 2019 Iceland Airwaves is a festival you need to visit once in your life. Everything from lagoons and bookstores to bars and concert halls is filled with music.
Grundarfjordur Weather in September
Grundarfjordur in September sees low daytime temperatures of 11°C (52°F) and nighttime lows of 7°C (45°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.
Rainfall in Grundarfjordur in September
The month brings the most rain, so be prepared with an umbrella for the occasional shower. Looking at the last 30 years, the data shows about 17 days with rain, averaging 136 mm (5.4 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Grundarfjordur in September
September in Grundarfjordur brings typical temperatures with highs around 11°C (52°F) and lows of 7°C (45°F). Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. Nights drop to 7°C (45°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Grundarfjordur in September
The area experiences a moderate amount of sunshine, with approximately 106 hours of sunlight expected. This means a decent mix of sun and overcast.September in Grundarfjordur 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.
Grundarfjordur Temperature in September
Min Temperature
7°C (45°F)
Max Temperature
11°C (52°F)
Chance of Rain
56%
Precipitation
136 mm (5.4 in)
Rainy days
17 days
Humidity
79% *
Sunshine
106 hours *
Percentage Sunshine
27% *
* Data from: Stykkishólmur, Iceland (30 KM, 19 Miles).
Grundarfjordur Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grundarfjordur - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Grundarfjordur typically stay consistent throughout September, with daily highs averaging around 11°C (52°F). Nights are cold, with lows typically ranging from 4°C (39°F) to 8°C (46°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 records for Grundarfjordur in September
Browse day-by-day weather records for Grundarfjordur spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Grundarfjordur historical weather extremes in September
Our historical data for Grundarfjordur spans 1996 to 2026, revealing these weather extremes.
- The hottest September day on record in Grundarfjordur reached 17°C (63°F) (September 1, 2010).
- Grundarfjordur experienced its chilliest September day on September 23, 2005, reaching only 3°C (37°F).
- The lowest overnight temperature recorded in September was -3°C (27°F) (September 25, 2007).
- Peak precipitation in September occurred on September 19, 2019, when 62 mm (2.4 in) of precipitation was measured.
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
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Grundarfjordur 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. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Grundarfjordur in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming5/10 -
Cycling5/10 -
Walking5/10 -
Camping3/10 -
Outdoor sports5/10
Grundarfjordur 3-Day Forecast
More climate data for Grundarfjordur
Temperature Rainfall Sunshine Humidity
See the full Grundarfjordur climate overview or explore weather in Iceland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Reykjavík
12°C (54°F) Kópavogur12°C (54°F) Hella
13°C (55°F) Selfoss12°C (54°F) Keflavík12°C (54°F) Höfn10°C (50°F) Egilsstadir
10°C (50°F) Akureyri9°C (48°F) Bucket list
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