May 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 May

May in Ketchikan is characterized by pleasanter temperatures and the manifestation of spring in its full glory. The range of temperatures expands, from 43.5°F (6.4°C) to 53.4°F (11.9°C), instilling warmth in the air. Traces of snowfall, recorded at 0.08" (2mm), indicate the vanishing remnants of winter. Daylight stretches for an impressive 16.3 hours, accentuating the city's scenic beauty. May proposes an introduction to the charm of Alaskan summers.

Temperature

Ketchikan's May weather indicates a minor ascent in high-temperatures, adjusting from a chilly 46°F (7.8°C) in April to a cool 53.4°F (11.9°C). Ketchikan cools down to an average low-temperature of 43.5°F (6.4°C) throughout the month of May.

Humidity

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

Rainfall

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

Snowfall

Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, 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 May, the average ocean temperature in Ketchikan is 48°F (8.9°C).
Note: Swimming at temperatures less than 50°F (10°C) in 48°F (8.9°C) is feasible with the right swimsuit; if not, expect cold shock and breathlessness. A quick swim at 55.4°F (13°C) without adequate warmth can be discomforting.

Daylight

The average length of the day in May in Ketchikan, Alaska, is 16h and 15min.
On the first day of May in Ketchikan, sunrise is at 5:02 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 4:12 am and sunset at 9:16 pm AKDT.

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 May is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A typical high UV index of 3 in May suggests the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
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Frequently asked questions

What is the average May temperature in Ketchikan?

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

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

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.

How many days does it rain in May in Ketchikan?

In Ketchikan, Alaska, in May, it is raining for 17.1 days, with typically 3.46" (88mm) of accumulated 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 ocean temperature in May in Ketchikan?

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

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

In May, the average day length in Ketchikan, Alaska, is 16h and 15min.

When are sunrise and sunset in May in Ketchikan?

On the first day of May, sunrise is at 5:02 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 4:12 am and sunset at 9:16 pm AKDT.

What month has the most sunshine in Ketchikan?

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

How many hours of sunshine does Ketchikan have in May?

The average sunshine duration in May 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, Alaska, is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to 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 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"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 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").
The 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).
The 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: 16h and 2min

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 May: 7h and 1min

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 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

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 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

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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