Unalaska
Alaska, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Unalaska, AK

May, the last month of the spring, in Unalaska, is a frosty 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).

Temperature

In May, the average high-temperature is essentially the same as in April - a chilly 46°F (7.8°C). The average low-temperature, in Unalaska, is 36.7°F (2.6°C).

Rainfall

In Unalaska, during May, the rain falls for 17 days and regularly aggregates up to 4" (101.1mm) of precipitation. In Unalaska, during the entire year, the rain falls for 223 days and collects up to 60.9" (1545.8mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Unalaska. May is the last month it regularly snows in Unalaska. Throughout May, Unalaska aggregates 0.2" (5.1mm) of snow. Throughout the year, in Unalaska, 91.5" (2324.1mm) of snow is accumulated.

Ocean temperature

In Unalaska, Alaska, the average seawater temperature is 41.4°F (5.2°C).
Note: Swimming in 41.4°F (5.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In May, the average length of the day is 16h.

Sunshine

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

UV index

In Unalaska, Alaska, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Unalaska?

In May, in Unalaska, Alaska, the average high-temperature is 46°F (7.8°C), and the average low-temperature is 36.7°F (2.6°C).

How much does it rain in Unalaska in May?

In Unalaska, Alaska, during May, the rain falls for 17 days and regularly aggregates up to 4" (101.1mm) of precipitation.

What is the last month it snows in Unalaska?

May is the last month it regularly snows in Unalaska. Throughout May, Unalaska aggregates 0.2" (5.1mm) of snow.

How cold is the water in May in Unalaska?

In Unalaska, Alaska, the average seawater temperature in May is 41.4°F (5.2°C). Swimming in 41.4°F (5.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the average length of the day in May in Unalaska?

The average length of the day in May is 16h.

What is the month with the most sunshine in Unalaska?

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

How long on average sun shines in May in Unalaska?

In May, the average sunshine is 8h.

What is the UV index intensity in May in Unalaska?

The average daily maximum UV index in May in Unalaska is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.
Average temperature in May - Unalaska, AK
  • Average high temperature in May: 46.1°F

The warmest month (with the highest average high temperature) is August (58.9°F).
The month with the lowest average high temperature is January (36.8°F).

  • Average low temperature in May: 36.7°F

The month with the highest average low temperature is August (47.7°F).
The coldest month (with the lowest average low temperature) is February (27.6°F).

Average rainfall in May - Unalaska, AK
  • Average rainfall in May: 4"

The wettest month (with the highest rainfall) is December (7.9").
The driest month (with the lowest rainfall) is July (2.2").

Average rainfall days in May - Unalaska, AK
  • Average rainfall days in May: 17 days

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 in May - Unalaska, AK
  • Average snowfall in May: 0.2"

The month with the highest snowfall is January (23.8").
Months with the lowest snowfall are June, July, August and September (0").

Average sea temperature in May - Unalaska, AK
  • Average sea temperature in May: 41.4°F

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 in May / Average sunshine in May - Unalaska, AK
  • Average daylight in May: 16h

The month with the longest days is June (Average daylight: 17h).
The month with shortest days is December (Average daylight: 7.5h).

  • Average sunshine in May: 8h

Months with most sunshine are May and June (Average sunshine: 8h).
Months with least sunshine are November and December (Average sunshine: 5).

Average UV index in May - Unalaska, AK
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).