Garðabær Weather in September
September in Garðabær brings moderate temperatures, with daytime highs of 12°C (54°F) and nights around 6°C (43°F). Quite a bit of rainfall is expected, around 147 mm (5.8 in), so pack an umbrella.
Rainfall in Garðabær in September
You can expect rain on roughly 18 days based on historical data, averaging 147 mm (5.8 in) for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Garðabær in September
In September, expect moderate temperatures in Garðabær, with highs of 12°C (54°F) and lows of 6°C (43°F) at night. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With overnight lows of 6°C (43°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Garðabær in September
The month experiences a moderate amount of sunlight, with 121 hours of sunshine. This provides a nice balance between sunshine and clouds.
Wind Speed in Garðabær in September
Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.
Average water temperature in September
With water temperatures around 10°C (50°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June and July typically offer the best weather for Garðabær.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Garðabær's climate page.
Garðabær Temperature in September
Min Temperature
6°C (43°F)
Max Temperature
12°C (54°F)
Water Temperature
10°C (50°F) *
Chance of Rain
60%
Precipitation
147 mm (5.8 in)
Rainy days
18 days
Humidity
79% *
Windspeed
5 m/s (10 knots) *
Sunshine
121 hours *
Percentage Sunshine
30% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Garðabær typically stay consistent throughout September, with daily highs averaging around 12°C (54°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 for Garðabær in September
Browse day-by-day weather records for Garðabær spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Garðabær historical weather extremes in September
Our historical data for Garðabær spans 1976 to 2025, revealing these weather extremes.
- The hottest September day on record in Garðabær reached 18°C (64°F) (September 1, 2006).
- On September 30, 1981, Garðabær saw its coldest September day with temperatures maxing out at 3°C (37°F).
- Garðabær registered its coldest September night on September 25, 2005, with temperatures dropping to -3°C (27°F).
- The wettest day in September Garðabær was on September 12, 2007 with 37 mm (1.5 in) of precipitation.
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
What to Wear in Garðabær 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. Expect water temperatures of around 10°C (50°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Garðabær in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Garðabær's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Garðabær climate overview or explore weather in Iceland.
