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

April weather forecast and climate
Unalaska, AK

April, like March, in Unalaska, Alaska, is another cold spring month, with average temperature varying between 31.5°F (-0.3°C) and 40.8°F (4.9°C).

Temperature

In April, the average high-temperature is relatively the same as in March - a still wintry 40.8°F (4.9°C). In April, the average low-temperature is 31.5°F (-0.3°C).

Rainfall

In Unalaska, in April, it is raining for 17 days, with typically 3.5" (87.9mm) of accumulated precipitation. Throughout the year, in Unalaska, there are 223 rainfall days, and 60.9" (1545.8mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Unalaska are January through May, October through December. In Unalaska, 6.6" (167.6mm) of snow is typically accumulated. Throughout the year, in Unalaska, 91.5" (2324.1mm) of snow is accumulated.

Ocean temperature

In Unalaska, Alaska, the average water temperature is 39°F (3.9°C).
Note: For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

Daylight

The average length of the day in Unalaska is 14.1h.

Sunshine

In Unalaska, the average sunshine in April is 7h.

UV index

In Unalaska, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In April, the average maximum UV index of 3 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in April in Unalaska?

In April, in Unalaska, Alaska, the average high-temperature is 40.8°F (4.9°C), and the average low-temperature is 31.5°F (-0.3°C).

How much does it rain in Unalaska in April?

In April, in Unalaska, Alaska, the rain falls for 17 days. Throughout April, 3.5" (87.9mm) of precipitation is accumulated.

How much does it snow in Unalaska in April?

During April, Unalaska regularly aggregates up to 6.6" (167.6mm) of snow.

How cold is the water in April in Unalaska?

In Unalaska, in April, the average water temperature is 39°F (3.9°C). 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 average length of the day in April in Unalaska?

In Unalaska, the average length of the day in April is 14.1h.

How long on average sun shines in April in Unalaska?

In Unalaska, Alaska, the average sunshine in April is 7h.

What is the UV index intensity in April in Unalaska?

In April, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.
Average temperature in April - Unalaska, AK
  • Average high temperature in April: 40.9°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 April: 31.4°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 April - Unalaska, AK
  • Average rainfall in April: 3.5"

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 April - Unalaska, AK
  • Average rainfall days in April: 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 April - Unalaska, AK
  • Average snowfall in April: 6.6"

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 April - Unalaska, AK
  • Average sea temperature in April: 39°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 April / Average sunshine in April - Unalaska, AK
  • Average daylight in April: 14.1h

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 April: 7h

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 April - Unalaska, AK
  • Average UV index in April: 3

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).