August weather forecast and climate
Ketchikan, AK

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

The last month of the summer, August, is also an enjoyable month in Ketchikan, Alaska, with temperature in the range of an average low of 52°F (11.1°C) and an average high of 60.8°F (16°C).

Temperature

July and August, with an average high-temperature of 60.8°F (16°C), are the warmest months.

Humidity

In Ketchikan, the average relative humidity is 87%.

Rainfall

In August, in Ketchikan, the rain falls for 18.6 days. Throughout August, 7.01" (178mm) of precipitation is accumulated. Throughout the year, in Ketchikan, there are 221.8 rainfall days, and 80" (2032mm) of precipitation is accumulated.

Snowfall

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

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: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

The average length of the day in Ketchikan is 14.9h.

Sunshine

The average sunshine in Ketchikan is 7h.

UV index

July and August, with an average maximum UV index of 4, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 4 in August transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the warmest month in Ketchikan?

Warmest months are July and August, with an average high-temperature of 60.8°F (16°C).

What is the temperature in August in Ketchikan?

In August, in Ketchikan, the average high-temperature is 60.8°F (16°C), and the average low-temperature is 52°F (11.1°C).

What is the average humidity in August in Ketchikan?

The average relative humidity in August is 87%.

How many days does it rain in August in Ketchikan?

In Ketchikan, Alaska, in August, it is raining for 18.6 days, with typically 7.01" (178mm) of accumulated precipitation.

When it does not snow in Ketchikan?

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

What is the month with the warmest ocean in Ketchikan?

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

How cold is the water 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.

How many hours of daylight does Ketchikan have in August?

The average length of the day in August in Ketchikan is 14.9h.

How long on average sun shines in August in Ketchikan?

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

When is the highest UV index in Ketchikan?

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

How high is the UV index in August in Ketchikan?

In Ketchikan, the average daily maximum UV index in August is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

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"

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

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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").
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).
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: 14.9h

The month with the longest days is June (Average daylight: 17.4h).
The month with the shortest days is December (Average daylight: 7.2h).

  • Average sunshine in August: 7h

The month with the most sunshine is May (Average sunshine: 7.2h).
The month with the least sunshine is January (Average sunshine: 3h).

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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

Months with the highest UV index are July and August (UV index 4).
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

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

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