August weather forecast
Sitka, AK

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The glacial carved Three Sisters Mountains in Sitka, Alaska
The glacial carved Three Sisters Mountains in Sitka, Alaska

Weather in August

The Sitka weather in August experiences minor changes from July. Albeit the temperatures may be similar, an increase in rainfall taking up to 6.18" (157mm) is noted. Daylight hours begin to reduce, signifying the shortening of summer days. Humidity and wind speeds remain fairly constant, maintaining a stable summer climate. Hence, August carries forward the tradition of a mild Alaskan summer with a slight increase in rainfall.

Temperature

Sitka's August weather reaches an average high of 57.9°F (14.4°C) and an average low of 51.1°F (10.6°C), making it the warmest month.

Humidity

August is the most humid month in Sitka, with an average relative humidity of 89%.

Rainfall

In Sitka, in August, during 21.8 rainfall days, 6.18" (157mm) of precipitation is typically accumulated. Throughout the year, in Sitka, there are 243.6 rainfall days, and 82.76" (2102mm) of precipitation is accumulated.

Snowfall

In Sitka, snow does not fall in June through September.

Daylight

In August, the average length of the day in Sitka is 15h and 7min.
On the first day of the month, sunrise is at 5:01 am and sunset at 9:13 pm. On the last day of August, in Sitka, sunrise is at 6:03 am and sunset at 7:59 pm AKDT.

Sunshine

In August, the average sunshine in Sitka is 5.9h.

UV index

In August, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: A daily maximum UV index of 3 in August translates into the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What is the warmest month in Sitka?

August, with average temperatures reaching a high of 57.9°F (14.4°C) and a low of 51.1°F (10.6°C), is the warmest month in Sitka.

What is the temperature in August in Sitka?

The high-temperature in Sitka during August is 57.9°F (14.4°C) and the low-temperature is 51.1°F (10.6°C).

What is the most humid month in Sitka?

With an average relative humidity of 89%, August is the most humid month in Sitka.

What is the average humidity in August in Sitka?

In Sitka, the average relative humidity in August is 89%.

How many days does it rain in August in Sitka?

In Sitka, in August, during 21.8 rainfall days, 6.18" (157mm) of precipitation is typically accumulated.

When it does not snow in Sitka?

June through September are months without snowfall.

What is the average length of the day in August in Sitka?

In Sitka, Alaska, the average day length in August is 15h and 7min.

When are sunrise and sunset in August in Sitka?

On the first day of August, sunrise is at 5:01 am and sunset at 9:13 pm. On the last day of the month, sunrise is at 6:03 am and sunset at 7:59 pm AKDT.

How many hours of sunshine does Sitka have in August?

In August, the average sunshine duration is 5.9h.

How high is the UV index in August in Sitka?

In August, the average daily maximum UV index in Sitka is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
Sitka, AK

Average temperature in August - Sitka, AK
  • Average high temperature in August: 57.9°F

The warmest month (with the highest average high temperature) is August (57.9°F).
The month with the lowest average high temperature is January (34.7°F).

  • Average low temperature in August: 51.1°F

The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is February (29.7°F).

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Average pressure in August
Sitka, AK

Average pressure in August - Sitka, AK
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is July (30.05"Hg).
The month with the lowest atmospheric pressure is November (29.72"Hg).

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Average wind speed in August
Sitka, AK

Average wind speed in August - Sitka, AK
  • Average wind speed in August: 5.8mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).

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Average humidity in August
Sitka, AK

Average humidity in August - Sitka, AK
  • Average humidity in August: 89%

The month with the highest relative humidity is August (89%).
The months with the lowest relative humidity are February and March (83%).

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Average rainfall in August
Sitka, AK

Average rainfall in August - Sitka, AK
  • Average rainfall in August: 6.18"

The wettest month (with the highest rainfall) is November (10.16").
The driest month (with the least rainfall) is May (3.82").

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Average rainfall days in August
Sitka, AK

Average rainfall days in August - Sitka, AK
  • Average rainfall days in August: 21.8 days

The month with the highest number of rainy days is October (23.5 days).
The month with the least rainy days is February (14.6 days).

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Average snowfall in August
Sitka, AK

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

The month with the highest snowfall is March (17.72").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in August
Sitka, AK

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

The month with the highest number of snowfall days is March (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in August /
Average sunshine in August
Sitka, AK

Average daylight in August / Average sunshine in August - Sitka, AK
  • Average daylight in August: 15h and 1min

The month with the longest days is June (Average daylight: 17h and 48min).
The month with the shortest days is December (Average daylight: 6h and 48min).

  • Average sunshine in August: 5h and 5min

The month with the most sunshine is May (Average sunshine: 6h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).

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Average sunshine days in August
Sitka, AK

Average sunshine days in August - Sitka, AK
  • Average sunshine days in August: 7.4 days

The month with the most sunshine days is May (8.8 days).
The month with the least sunshine days is June (4.8 days).

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Average UV index in August
Sitka, AK

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

The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in August
Sitka, AK

Average cloud cover in August - Sitka, AK
  • Average cloud cover in August: 65

The month with the most cloud cover is January (Cloud cover 72).
The months with the least cloud cover are February, May and September (Cloud cover 60).

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Average visibility in August
Sitka, AK

Average visibility in August - Sitka, AK
  • Average visibility in August: 5mi

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

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Sitka, Alaska, USA

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