August weather forecast
Ketchikan, AK

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Beautiful and colorful houses along the waterfront boardwalk on Creek Street in Ketchikan, Alaska
Beautiful and colorful houses along the waterfront boardwalk on Creek Street in Ketchikan, Alaska

Weather in August

August in Ketchikan maintains the summer spirit, with temperatures identical to July, fluctuating between 52°F (11.1°C) and 60.8°F (16°C). Despite rainfall becoming considerably heavier, 7.01" (178mm) compared to July, the warmth persists. Although the daylight hours reduce to 14.9, the ambiance remains largely bright and congenial. This period witnesses enriching weather that justifies its place as a haven for nature enthusiasts.

Temperature

Ketchikan's temperatures tend to hit their maximum during July and August, with an average high-temperature of 60.8°F (16°C).

Humidity

The average relative humidity in August is 87%.

Rainfall

In August, in Ketchikan, the rain falls for 18.6 days. Throughout August, 7.01" (178mm) of precipitation is accumulated. In Ketchikan, during the entire year, the rain falls for 221.8 days and collects up to 80" (2032mm) of precipitation.

Snowfall

June through October are months without snowfall in Ketchikan.

Ocean temperature

The month with the warmest seawater in Ketchikan is August, with an average ocean temperature of 55.9°F (13.3°C).
Note: Swimming in 55.9°F (13.3°C) poses a severe threat. Even short exposure to 55.4°F (13°C) is chilling, and going below 50°F (10°C) can cause breathing irregularities and intense cold shock, based on one's stamina.

Daylight

The average length of the day in August is 14h and 55min.
On the first day of the month, sunrise is at 4:55 am and sunset at 8:50 pm. On the last day of August, in Ketchikan, sunrise is at 5:52 am and sunset at 7:41 pm AKDT.

Sunshine

In August, the average sunshine in Ketchikan is 7h.

UV index

The months with the highest UV index in Ketchikan are July and August, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The daily high UV index of 4 in August translates into this advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. When the Sun is at its strongest around midday, find shade and limit exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

What is the warmest month in Ketchikan?

Ketchikan witnesses its peak temperatures during July and August, when the average high-temperature reaches 60.8°F (16°C).

What are August temperatures in Ketchikan?

The high-temperature, in August, in Ketchikan, is 60.8°F (16°C), while the low-temperature averages to 52°F (11.1°C).

What is the average humidity in August in Ketchikan?

The average relative humidity in August in Ketchikan, Alaska, is 87%.

How much does it rain in Ketchikan in August?

In Ketchikan, during August, the rain falls for 18.6 days and regularly aggregates up to 7.01" (178mm) of precipitation.

When it does not snow in Ketchikan?

In Ketchikan, Alaska, snow does not fall in June through October.

What month is the ocean warmest in Ketchikan?

August is the month with the warmest seawater in Ketchikan, with an average ocean temperature of 55.9°F (13.3°C).

What is the ocean temperature in August in Ketchikan?

In August, the average ocean temperature in Ketchikan is 55.9°F (13.3°C). Swimming in 55.9°F (13.3°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.

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

In Ketchikan, Alaska, the average day length in August is 14h and 55min.

When is the sunrise / sunset in August in Ketchikan?

In August, on the first day of the month, sunrise is at 4:55 am and sunset at 8:50 pm. On the last day of the month, in Ketchikan, sunrise is at 5:52 am and sunset at 7:41 pm AKDT.

How long on average sun shines in August in Ketchikan?

The average sunshine duration in August in Ketchikan, Alaska, is 7h.

What is the month with the highest UV index in Ketchikan?

The months with the highest UV index are July and August, with an average maximum UV index of 4.

How high is the UV index in August in Ketchikan?

The average daily maximum UV index in August in Ketchikan, Alaska, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
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
Ketchikan, AK

Average temperature in August - Ketchikan, AK
  • Average high temperature in August: 60.8°F

The warmest months (with the highest average high temperature) are July and August (60.8°F).
The month with the lowest average high temperature is December (35.8°F).

  • Average low temperature in August: 52°F

The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is February (30.6°F).

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Average pressure in August
Ketchikan, AK

Average pressure in August - Ketchikan, AK
  • Average pressure in August: 30"Hg

The month with the highest atmospheric pressure is July (30.06"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).

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Average wind speed in August
Ketchikan, AK

Average wind speed in August - Ketchikan, AK
  • Average wind speed in August: 5.3mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

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Average humidity in August
Ketchikan, AK

Average humidity in August - Ketchikan, AK
  • Average humidity in August: 87%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (82%).

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Average rainfall in August
Ketchikan, AK

Average rainfall in August - Ketchikan, AK
  • Average rainfall in August: 7.01"

The wettest month (with the highest rainfall) is January (9.69").
The driest month (with the least rainfall) is May (3.46").

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Average rainfall days in August
Ketchikan, AK

Average rainfall days in August - Ketchikan, AK
  • Average rainfall days in August: 18.6 days

The month with the highest number of rainy days is November (21.4 days).
The month with the least rainy days is February (14.2 days).

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Average snowfall in August
Ketchikan, AK

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

The month with the highest snowfall is February (13.11").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in August
Ketchikan, AK

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

The month with the highest number of snowfall days is March (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in August
Ketchikan, AK

Average sea temperature in August - Ketchikan, AK
  • Average sea temperature in August: 55.9°F

The best month for swimming (with the highest average sea temperature) is August (55.9°F).
The coldest month (with the lowest average sea temperature) is March (42.5°F).

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

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

The month with the longest days is June (Average daylight: 17h and 24min).
The month with the shortest days is December (Average daylight: 7h and 12min).

  • Average sunshine in August: 7h and 0min

The month with the most sunshine is May (Average sunshine: 7h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

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Average sunshine days in August
Ketchikan, AK

Average sunshine days in August - Ketchikan, AK
  • Average sunshine days in August: 11.4 days

The month with the most sunshine days is July (11.9 days).
The month with the least sunshine days is November (5.6 days).

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Average UV index in August
Ketchikan, AK

Average UV index in August - Ketchikan, AK
  • Average UV index in August: 4

The months with the highest UV index are July and August (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
Ketchikan, AK

Average cloud cover in August - Ketchikan, AK
  • Average cloud cover in August: 57

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 55).

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Average visibility in August
Ketchikan, AK

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

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

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Ketchikan, Alaska, USA

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