Kópavogur Weather in September
During September, Kópavogur experiences moderate daytime temperatures of 12°C (54°F) and cooler nights around 6°C (43°F). Expect quite a bit of rainfall. Around 146 mm (5.7 in) is typical.
Rainfall in Kópavogur in September
On average, there are about 18 days with rain during this month, averaging 146 mm (5.7 in). 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 Kópavogur in September
September in Kópavogur sees highs of 12°C (54°F) and lows of 6°C (43°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to 6°C (43°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Kópavogur in September
The month brings about 121 hours of sunlight, offering a comfortable mix of sun and overcast.
Wind Speed in Kópavogur 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
At 10°C (50°F), the water is too cold for most people to swim comfortably. A wetsuit is pretty much essential if you plan to go in.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Kópavogur. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Kópavogur's climate page.
Kópavogur 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
146 mm (5.7 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 Kópavogur 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 Kópavogur in September
Browse day-by-day weather records for Kópavogur spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Kópavogur historical weather extremes in September
According to our 49 years of weather records for Kópavogur, the following extremes were recorded between 1976 and 2025.
- Kópavogur recorded its highest September temperature of 18°C (64°F) on September 1, 2006.
- On September 30, 1981, Kópavogur saw its coldest September day with temperatures maxing out at 3°C (37°F).
- The lowest overnight temperature recorded in September was -3°C (27°F) (September 25, 2005).
- The heaviest September precipitation occurred on September 12, 2007, when 37 mm (1.5 in) of precipitation fell.
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
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tolerable
unpleasant
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What to Wear in Kópavogur in September
Pack for changing conditions in Kópavogur in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. 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 Kópavogur 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 Kópavogur's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Kópavogur climate overview or explore weather in Iceland.
