Monthly weather forecast and climate
Unalaska, AK

January, like December, in Unalaska, Alaska, is a cold winter month, with average temperature fluctuating between 28°F (-2.2°C) and 36.9°F (2.7°C). With an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 28°F (-2.2°C), January is the coldest month. Weather in January »
February, the last month of the winter, in Unalaska, is also a cold month, with temperature in the range of an average low of 27.7°F (-2.4°C) and an average high of 37.2°F (2.9°C). The average high-temperature, in February, is 37.2°F (2.9°C), while the average low-temperature is 27.7°F (-2.4°C). Weather in February »

The first month of the spring, March, is still a cold month in Unalaska, Alaska, with average temperature varying between 28.2°F (-2.1°C) and 38.7°F (3.7°C). The average high-temperature, in March, is 38.7°F (3.7°C), while the average low-temperature is 28.2°F (-2.1°C). Weather in March »

April, like March, in Unalaska, Alaska, is another cold spring month, with average temperature fluctuating between 31.5°F (-0.3°C) and 40.8°F (4.9°C). In Unalaska, Alaska, in April, the average high-temperature is 40.8°F (4.9°C), and the average low-temperature is 31.5°F (-0.3°C). Weather in April »

May, the last month of the spring, in Unalaska, is a chilly month, with temperature in the range of an average low of 36.7°F (2.6°C) and an average high of 46°F (7.8°C). In May, the average high-temperature is 46°F (7.8°C), and the average low-temperature is 36.7°F (2.6°C). Weather in May »

June, the first month of the summer, in Unalaska, is a cool month, with temperature in the range of an average low of 41.9°F (5.5°C) and an average high of 51.6°F (10.9°C). The average high-temperature, is 51.6°F (10.9°C), while the average low-temperature is 41.9°F (5.5°C). Weather in June »

July in Unalaska, Alaska, is a mild summer month, with average temperature varying between 56.8°F (13.8°C) and 46°F (7.8°C). In Unalaska, the average high-temperature is 56.8°F (13.8°C), and the average low-temperature is 46°F (7.8°C). Weather in July »

August, the last month of the summer, in Unalaska, is another mild month, with average temperature ranging between max. 58.8°F (14.9°C) and min. 47.7°F (8.7°C). The warmest month is August, with an average high-temperature of 58.8°F (14.9°C) and an average low-temperature of 47.7°F (8.7°C). Weather in August »

The first month of the autumn, September, is still a cool month in Unalaska, Alaska, with average temperature fluctuating between 54°F (12.2°C) and 43.5°F (6.4°C). In September, the average high-temperature is 54°F (12.2°C), and the average low-temperature is 43.5°F (6.4°C). Weather in September »

October, the same as September, in Unalaska, Alaska, is a chilly autumn month, with temperature in the range of an average low of 37.2°F (2.9°C) and an average high of 47.3°F (8.5°C). In Unalaska, in October, the average high-temperature is 47.3°F (8.5°C), and the average low-temperature is 37.2°F (2.9°C). Weather in October »

November, the last month of the autumn, in Unalaska, is another cold month, with average temperature fluctuating between 42.6°F (5.9°C) and 32.2°F (0.1°C). In November, the average high-temperature is 42.6°F (5.9°C), and the average low-temperature is 32.2°F (0.1°C). Weather in November »

December, the first month of the winter, in Unalaska, is also a cold month, with average temperature ranging between min. 30.4°F (-0.9°C) and max. 39°F (3.9°C). The average high-temperature, in December, is 39°F (3.9°C), while the average low-temperature is 30.4°F (-0.9°C). Weather in December »

What is the coldest month in Unalaska?

With an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 28°F (-2.2°C), January is the coldest month.

How many days does it rain in Unalaska?

Throughout the year, in Unalaska, Alaska, there are 223 rainfall days, and 60.9" (1545.8mm) of precipitation is accumulated.

When does it snow in Unalaska?

Months with snowfall in Unalaska are January through May, October through December.

How much does it snow in Unalaska?

In Unalaska, Alaska, during the entire year, snow aggregates up to 91.5" (2324.1mm).

When does it snow the most in Unalaska?

The month with the most snowfall in Unalaska is January when 23.8" (604.5mm) of snow is typically aggregated.

What is the month with the lowest UV index in Unalaska?

Months with the lowest UV index in Unalaska, Alaska, are January and December, with an average UV index of 0.

When is the ocean coldest in Unalaska?

February and March, with an average ocean temperature of 38.8°F (3.8°C), are months with the coldest seawater in Unalaska. For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

What is the month with the most sunshine in Unalaska?

Months with the most sunshine are May and June, with an average of 8h of sunshine.

When are the longest days in Unalaska?

The month with the longest days is June, with an average of 17h of daylight.

What is the driest month in Unalaska?

The month with the least rainfall is July when the rain falls for 13 days and typically collects 2.2" (55.6mm) of precipitation.

When is the highest UV index in Unalaska?

July is the month with the highest UV index in Unalaska, with an average UV index of 6.

What is the warmest month in Unalaska?

The warmest month in Unalaska is August, with an average high-temperature of 58.8°F (14.9°C) and an average low-temperature of 47.7°F (8.7°C).

When is the ocean warmest in Unalaska?

With an average ocean temperature of 50.2°F (10.1°C), August is the month with the warmest seawater in Unalaska. Swimming in 50.2°F (10.1°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the least sunshine in Unalaska?

Months with the least sunshine in Unalaska, Alaska, are November and December, with an average of 5h of sunshine.

What is the wettest month in Unalaska?

The month with the most rainfall in Unalaska is December when the rain falls for 23 days and typically aggregates up to 7.9" (200.4mm) of precipitation.

What is the month with the shortest days in Unalaska?

The month with the shortest days in Unalaska, Alaska, is December, with an average of 7.5h of daylight.
Average temperature - Unalaska, AK
Average rainfall - Unalaska, AK
Average rainfall days - Unalaska, AK

Months with the highest number of rainy days are October, November and December (23 days).
The month with the lowest number of rainy days is July (13 days).

Average snowfall - Unalaska, AK
Average sea temperature - Unalaska, AK

The best month for swimming (with the highest average sea temperature) is August (50.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

Average daylight / Average sunshine - Unalaska, AK
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