Monthly weather forecast and climate
Keflavík International Airport, Iceland

Weather in January

In January, the average sea temperature in Keflavík International Airport, Iceland, is 5.3°C (41.5°F). Note: Swimming in 5.3°C (41.5°F) is considered dangerous. Weather in January »

Weather in February

In Keflavík International Airport, Iceland, the average seawater temperature in February is 5.3°C (41.5°F). Note: Swimming in 5.3°C (41.5°F) is considered dangerous. Weather in February »

Weather in March

With an average sea temperature of 4.8°C (40.6°F), March is the month with the coldest seawater in Keflavík International Airport, Iceland. Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Weather in March »

Weather in April

In Keflavík International Airport, Iceland, in April, the average water temperature is 5.8°C (42.4°F). Note: Swimming in 5.8°C (42.4°F) is considered life-threatening. Weather in April »

Weather in May

In Keflavík International Airport, Iceland, the average seawater temperature in May is 7.2°C (45°F). Note: Swimming in 7.2°C (45°F) is considered dangerous. Weather in May »

Weather in June

In Keflavík International Airport, Iceland, in June, the average water temperature is 9.3°C (48.7°F). Note: Swimming in 9.3°C (48.7°F) is considered dangerous. Weather in June »

Weather in July

July is the month with the warmest seawater in Keflavík International Airport, Iceland, with an average sea temperature of 11.4°C (52.5°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in July »

Weather in August

In Keflavík International Airport, Iceland, in August, the average water temperature is 11.3°C (52.3°F). Note: Swimming in 11.3°C (52.3°F) is considered life-threatening. Weather in August »

Weather in September

In Keflavík International Airport, Iceland, the average seawater temperature in September is 9.8°C (49.6°F). Note: Swimming in 9.8°C (49.6°F) is considered life-threatening. Weather in September »

Weather in October

In Keflavík International Airport, Iceland, the average seawater temperature in October is 8.3°C (46.9°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in October »

Weather in November

In November, the average sea temperature in Keflavík International Airport, Iceland, is 7.2°C (45°F). Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Weather in November »

Weather in December

In Keflavík International Airport, Iceland, in December, the average water temperature is 6.6°C (43.9°F). Note: Swimming in 6.6°C (43.9°F) is considered life-threatening. Weather in December »
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FAQ

What is the month with the coldest sea water in Keflavík International Airport?

With an average sea temperature of 4.8°C (40.6°F), March is the month with the coldest seawater in Keflavík International Airport, Iceland.

When are the longest days in Keflavík International Airport?

June has the longest days of the year in Keflavík International Airport, Iceland, with an average of 20.8h of daylight.

What is the month with the warmest sea water in Keflavík International Airport?

The month with the warmest seawater in Keflavík International Airport is July, with an average sea temperature of 11.4°C (52.5°F).

What is the month with the shortest days in Keflavík International Airport?

The month with the shortest days is December, with an average of 4.5h of daylight.

Average sea temperature
Keflavík International Airport, Iceland

Average sea temperature - Keflavík International Airport, Iceland

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).

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Average daylight
Keflavík International Airport, Iceland

Average daylight - Keflavík International Airport, Iceland

The month with the longest days is June (Average daylight: 20.8h).
The month with the shortest days is December (Average daylight: 4.5h).

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