August weather forecast
Unalaska, AK

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Weather in August

Unalaska's weather in August retains much of its summer characteristics, with the temperature remaining similar to July's, although a slight increase in rainfall to 2.56" (65mm) is noticeable. The humidity diminishes allowing for slightly drier conditions than in July. Daylight hours reduce while the sunshine duration remains relatively high, maintaining a warm feel. The sea temperature hits a high making it perfect for braving the water. Wind speed sees a minor boost but remains within comfortable limits.

Temperature

Unalaska's August weather, with an average high temperature of 53.2°F (11.8°C) and an average low temperature of 49.6°F (9.8°C), tends to be the warmest of the year.

Humidity

In Unalaska, the average relative humidity in August is 90%.

Rainfall

In Unalaska, in August, it is raining for 17.8 days, with typically 2.56" (65mm) of accumulated precipitation. In Unalaska, during the entire year, the rain falls for 198.8 days and collects up to 33.78" (858mm) of precipitation.

Snowfall

June through September are months without snowfall.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 50.2°F (10.1°C).
Note: Navigating the 50.2°F (10.1°C) at 55.4°F (13°C) is no joy, and temperatures less than 50°F (10°C) can threaten breathing and cause a chilling shock, gauging personal stamina.

Daylight

The average length of the day in August is 14h and 46min.
On the first day of August, sunrise is at 7:21 am and sunset at 11:02 pm. On the last day of the month, sunrise is at 8:14 am and sunset at 9:57 pm AKDT.

Sunshine

The average sunshine in August is 5.5h.

UV index

The months with the highest UV index are July and August, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 3 in August converts into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.

Frequently asked questions

What part of the year is the hottest?

Unalaska's warmest month, August, registers temperatures that range from a high of 53.2°F (11.8°C) to a low of 49.6°F (9.8°C).

What is the temperature in August?

The high-temperature, in August, in Unalaska, is 53.2°F (11.8°C), while the low-temperature averages to 49.6°F (9.8°C).

What is the average humidity in August?

The average relative humidity in August is 90%.

How much does it rain in August?

In Unalaska, in August, it is raining for 17.8 days, with typically 2.56" (65mm) of accumulated precipitation.

When it does not snow?

June through September are months without snowfall.

What month is the ocean warmest?

August is the month with the warmest seawater, with an average ocean temperature of 50.2°F (10.1°C).

What is the ocean temperature in August?

In August, the average ocean temperature is 50.2°F (10.1°C). Swimming in 50.2°F (10.1°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.

How many hours of daylight does Unalaska have in August?

The average day length in August in Unalaska is 14h and 46min.

When are sunrise and sunset in August?

On the first day of August, sunrise is at 7:21 am and sunset at 11:02 pm. On the last day of the month, sunrise is at 8:14 am and sunset at 9:57 pm AKDT.

How long on average sun shines in August?

The average sunshine duration in August is 5.5h.

What are the months with the highest UV index?

July and August, with an average maximum UV index of 3, are months with the highest UV index in Unalaska.

What is the UV index reading in August?

In August, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Unalaska, AK

Average temperature in August - Unalaska, AK
  • Average high temperature in August: 53.2°F

The warmest month (with the highest average high temperature) is August (53.2°F).
The month with the lowest average high temperature is March (34.7°F).

  • Average low temperature in August: 49.6°F

The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is March (30.7°F).

Average pressure in August
Unalaska, AK

Average pressure in August - Unalaska, AK
  • Average pressure in August: 29.92"Hg

The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is January (29.5"Hg).

Average wind speed in August
Unalaska, AK

Average wind speed in August - Unalaska, AK
  • Average wind speed in August: 9.6mph

The windiest months (with the highest average wind speed) are November and December (16.5mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).

Average humidity in August
Unalaska, AK

Average humidity in August - Unalaska, AK
  • Average humidity in August: 90%

The month with the highest relative humidity is July (91%).
The months with the lowest relative humidity are November and December (80%).

Average rainfall in August
Unalaska, AK

Average rainfall in August - Unalaska, AK
  • Average rainfall in August: 2.56"

The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is July (1.85").

Average rainfall days in August
Unalaska, AK

Average rainfall days in August - Unalaska, AK
  • Average rainfall days in August: 17.8 days

The month with the highest number of rainy days is October (21.8 days).
The month with the least rainy days is February (11.1 days).

Average snowfall in August
Unalaska, AK

Average snowfall in August - Unalaska, AK
  • Average snowfall in August: 0"

The month with the highest snowfall is January (6.97").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Unalaska, AK

Average snowfall days in August - Unalaska, AK
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in August
Unalaska, AK

Average sea temperature in August - Unalaska, AK
  • Average sea temperature in August: 50.1°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 August /
Average sunshine in August
Unalaska, AK

Average daylight in August / Average sunshine in August - Unalaska, AK
  • Average daylight in August: 14h and 5min

The month with the longest days is June (Average daylight: 17h and 0min).
The month with the shortest days is December (Average daylight: 7h and 30min).

  • Average sunshine in August: 5h and 3min

The month with the most sunshine is June (Average sunshine: 5h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).

Average sunshine days in August
Unalaska, AK

Average sunshine days in August - Unalaska, AK
  • Average sunshine days in August: 9.7 days

The month with the most sunshine days is August (9.7 days).
The month with the least sunshine days is April (3.8 days).

Average UV index in August
Unalaska, AK

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

The months with the highest UV index are July and August (UV index 3).
The months with the lowest UV index are February, March, April and November (UV index 1).

Average cloud cover in August
Unalaska, AK

Average cloud cover in August - Unalaska, AK
  • Average cloud cover in August: 67

The month with the most cloud cover is July (Cloud cover 74).
The months with the least cloud cover are September and October (Cloud cover 66).

Average visibility in August
Unalaska, AK

Average visibility in August - Unalaska, AK
  • Average visibility in August: 6mi

The months with the highest visibility are May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April, July and December (5mi).

Unalaska, Alaska, USA

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