Weather in September
Pacing towards the end of the third quarter of the year, Keflavík International Airport experiences a fall in sea temperature, with a decrease to 9.8°C (49.6°F) in September. This drop is a sign of the approaching colder months, and the distinct crispness in the air becomes apparent. Layered clothing becomes more suitable considering the changing weather conditions. The progressively shorter daylight hours prompt earlier sunsets, painting the sky in a plethora of stunning colors. Despite the dwindling temperatures, September offers unique weather patterns and vivid landscapes.
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 the month, sunrise is at 06:15 and sunset at 20:45. On the last day of September, in Keflavík International Airport, sunrise is at 07:38 and sunset at 19:02 GMT.
[Resources]Sea temperature
In Keflavík International Airport, in September, the average water 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
The average length of the day in September is 13h and 0min.On the first day of the month, sunrise is at 06:15 and sunset at 20:45. On the last day of September, in Keflavík International Airport, sunrise is at 07:38 and sunset at 19:02 GMT.
Frequently asked questions
What is the sea water temperature in September in Keflavík International Airport?
In Keflavík International Airport, Iceland, in September, the average water temperature 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 Keflavík International Airport have in September?
In Keflavík International Airport, the average day length in September is 13h and 0min.
When is the sunrise / sunset in September in Keflavík International Airport?
In September, on the first day of the month, sunrise is at 06:15 and sunset at 20:45. On the last day of the month, in Keflavík International Airport, Iceland, sunrise is at 07:38 and sunset at 19:02 GMT.
Average sea temperature in September
Keflavík International Airport, 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 (4.8°C).
Average daylight in September
Keflavík International Airport, 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 30min).
Keflavík International Airport, Iceland
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