Weather in September
September in Kópavogur commences the initial phase of autumn, as the warmth of the sea regress to a cooler 9.8°C (49.6°F). Decreased daylight hours accompany this gradual temperature shift, as the summer's residual effervescence begins to dim. The likeness of the weather to the upcoming October further instills the autumn atmosphere, gradually unpacking colder, darker days.
Note: With the appropriate swimsuit, one can swim in 9.8°C (49.6°F) even if temperatures dip below 10°C (50°F); otherwise, be ready for cold shock and breath issues. A fleeting swim around 13°C (55.4°F) is distressing.
On the first day of September in Kópavogur, sunrise is at 06:12 and sunset at 20:42. On the last day of the month, sunrise is at 07:35 and sunset at 18:59 GMT.
Sea temperature
In September, the average sea temperature is 9.8°C (49.6°F).Note: With the appropriate swimsuit, one can swim in 9.8°C (49.6°F) even if temperatures dip below 10°C (50°F); otherwise, be ready for cold shock and breath issues. A fleeting swim around 13°C (55.4°F) is distressing.
Daylight
In Kópavogur, the average length of the day in September is 13h and 1min.On the first day of September in Kópavogur, sunrise is at 06:12 and sunset at 20:42. On the last day of the month, sunrise is at 07:35 and sunset at 18:59 GMT.
Updated: Feb 10, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the sea water temperature in September in Kópavogur?
In Kópavogur, the average seawater temperature in September is 9.8°C (49.6°F). Swimming in 9.8°C (49.6°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.
How many hours of daylight does Kópavogur have in September?
The average day length in September in Kópavogur, Iceland, is 13h and 1min.
When is the sunrise / sunset in September in Kópavogur?
In September, on the first day of the month, sunrise is at 06:12 and sunset at 20:42. On the last day of the month, in Kópavogur, sunrise is at 07:35 and sunset at 18:59 GMT.
Average sea temperature in September
Kópavogur, Iceland
- Average sea temperature in September: 9.8°C
The best month for swimming (with the highest average sea temperature) is July (11.4°C).
The coldest month (with the lowest average sea temperature) is March (5.1°C).
Average daylight in September
Kópavogur, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 48min).
The month with the shortest days is December (Average daylight: 4h and 24min).
Kópavogur, Iceland
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