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 witnesses the warmest weather in August, with temperatures averaging a high of 57.9°F (14.4°C) and a low of 51.1°F (10.6°C).

Humidity

The most humid month is August, with an average relative humidity of 89%.

Rainfall

In Sitka, in August, it is raining for 21.8 days, with typically 6.18" (157mm) of accumulated precipitation. In Sitka, during the entire year, the rain falls for 243.6 days and collects up to 82.76" (2102mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in August is 15h and 7min.
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.

Sunshine

In August, the average sunshine is 5.9h.

UV index

In Sitka, Alaska, the average daily maximum UV index in August is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In August, the average maximum UV index of 3 translates into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Updated: Jun 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the hottest?

Sitka's August weather, with an average high temperature of 57.9°F (14.4°C) and an average low temperature of 51.1°F (10.6°C), tends to be the warmest of the year.

What is the average August temperature?

During August, Sitka experiences an average high-temperature of 57.9°F (14.4°C) and a low-temperature of 51.1°F (10.6°C).

What is the most humid month?

The most humid month is August, with an average relative humidity of 89%.

What is the average humidity in August?

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

How many days does it rain in August?

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

When it does not snow?

June through September are months without snowfall.

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

The average day length in August is 15h and 7min.

When are sunrise and sunset in August?

On the first day of August in Sitka, Alaska, 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?

The average sunshine duration in August is 5.9h.

What is the UV index intensity in August?

In August, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe 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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Sitka, Alaska, USA

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