May 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 May

The last month of the spring, May, is a fresh month in Ketchikan, Alaska, with average temperature fluctuating between 43.5°F (6.4°C) and 53.4°F (11.9°C).

Temperature

In May, the average high-temperature marginally rises, from a frosty 46°F (7.8°C) in April, to a fresh 53.4°F (11.9°C). In Ketchikan, in May, the average low-temperature is 43.5°F (6.4°C).

Humidity

May is the least humid month in Ketchikan, with an average relative humidity of 82%.

Rainfall

May is the month with the least rainfall. Rain falls for 17.1 days and accumulates 3.46" (88mm) of precipitation.

Snowfall

Months with snowfall in Ketchikan are January through May, November and December. May is the last month it regularly snows in Ketchikan. During 0.1 snowfall days, Ketchikan aggregates 0.08" (2mm) of snow. Throughout the year, there are 40.7 snowfall days, and 48.35" (1228mm) of snow is accumulated.

Ocean temperature

In Ketchikan, the average seawater temperature is 48°F (8.9°C).
Note: Swimming in 48°F (8.9°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.

Daylight

In Ketchikan, the average length of the day is 16.3h.

Sunshine

The month with the most sunshine in Ketchikan is May, with an average of 7.2h of sunshine.

UV index

The average daily maximum UV index in Ketchikan, Alaska, is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 3 in May transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in May in Ketchikan?

In May, the average high-temperature is 53.4°F (11.9°C), and the average low-temperature is 43.5°F (6.4°C).

What is the least humid month in Ketchikan?

With an average relative humidity of 82%, May is the least humid month in Ketchikan.

What is the average humidity in May in Ketchikan?

In Ketchikan, Alaska, the average relative humidity in May is 82%.

How many days does it rain in May in Ketchikan?

In Ketchikan, during May, the rain falls for 17.1 days and regularly aggregates up to 3.46" (88mm) of precipitation.

What is the driest month in Ketchikan?

The month with the least rainfall is May when the rain falls for 17.1 days and typically collects 3.46" (88mm) of precipitation.

What is the last month it snows in Ketchikan?

May is the last month it regularly snows in Ketchikan. During 0.1 snowfall days, in May, Ketchikan aggregates 0.08" (2mm) of snow.

What is the water temperature in May in Ketchikan?

In Ketchikan, in May, the average water temperature is 48°F (8.9°C). 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.

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

In Ketchikan, Alaska, the average length of the day in May is 16.3h.

What month has the most sunshine in Ketchikan?

With an average of 7.2h of sunshine, May has the most sunshine of the year in Ketchikan.

How many hours of sunshine does Ketchikan have in May?

In May, the average sunshine in Ketchikan, Alaska, is 7.2h.

How high is the UV index in May in Ketchikan?

The average daily maximum UV index in May in Ketchikan is 3. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in May
Ketchikan, AK

Average temperature in May - Ketchikan, AK
  • Average high temperature in May: 53.4°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 May: 43.5°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 May
Ketchikan, AK

Average pressure in May - Ketchikan, AK
  • Average pressure in May: 30.01"

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 May
Ketchikan, AK

Average wind speed in May - Ketchikan, AK
  • Average wind speed in May: 5.5mph

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 May
Ketchikan, AK

Average humidity in May - Ketchikan, AK
  • Average humidity in May: 82%

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 May
Ketchikan, AK

Average rainfall in May - Ketchikan, AK
  • Average rainfall in May: 3.46"

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 May
Ketchikan, AK

Average rainfall days in May - Ketchikan, AK
  • Average rainfall days in May: 17.1 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 May
Ketchikan, AK

Average snowfall in May - Ketchikan, AK
  • Average snowfall in May: 0.08"

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 May
Ketchikan, AK

Average snowfall days in May - Ketchikan, AK
  • Average snowfall days in May: 0.1 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 May
Ketchikan, AK

Average sea temperature in May - Ketchikan, AK
  • Average sea temperature in May: 48.1°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 May /
Average sunshine in May
Ketchikan, AK

Average daylight in May / Average sunshine in May - Ketchikan, AK
  • Average daylight in May: 16.3h

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 May: 7.2h

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 May
Ketchikan, AK

Average sunshine days in May - Ketchikan, AK
  • Average sunshine days in May: 11.8 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 May
Ketchikan, AK

Average UV index in May - Ketchikan, AK
  • Average UV index in May: 3

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 May
Ketchikan, AK

Average cloud cover in May - Ketchikan, AK
  • Average cloud cover in May: 55

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 May
Ketchikan, AK

Average visibility in May - Ketchikan, AK
  • Average visibility in May: 6mi

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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