August weather forecastUnalaska, AK
August
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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: 14h and 48min
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 30min
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: 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: 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: 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: 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).
