Keflavík International Airport
Iceland
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Keflavík International Airport, Iceland

In Keflavík International Airport, Iceland, the average seawater temperature in January is 5.3°C (41.5°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 January »

In February, 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 February »

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

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 dangerous. Weather in April »

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. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation. Weather in May »

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

With an average sea temperature of 11.4°C (52.5°F), July is the month with the warmest seawater in Keflavík International Airport, Iceland. Note: Swimming in 11.4°C (52.5°F) is considered dangerous. Weather in July »

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

In Keflavík International Airport, Iceland, the average seawater temperature in September is 9.8°C (49.6°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 September »

In October, the average sea temperature in Keflavík International Airport, Iceland, is 8.3°C (46.9°F). Note: Swimming in 8.3°C (46.9°F) is considered dangerous. Weather in October »

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 »

In December, the average sea temperature in Keflavík International Airport, Iceland, is 6.6°C (43.9°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 December »

What month is the sea coldest in Keflavík International Airport?

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

When are the longest days in Keflavík International Airport?

The month with the longest days in Keflavík International Airport is June, with an average of 20.8h of daylight.

When is the sea warmest in Keflavík International Airport?

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

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

December has the shortest days of the year in Keflavík International Airport, with an average of 4.5h of daylight.
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).

Average daylight - Keflavík International Airport, Iceland

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