Ketchikan
Alaska, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Ketchikan, AK

Beautiful and colorful houses along the iconic waterfront boardwalk on Creek Street in Ketchikan, Alaska
Beautiful and colorful houses along the iconic waterfront boardwalk on Creek Street in Ketchikan, Alaska
The last month of the spring, May, is a fresh month in Ketchikan, Alaska, with temperature in the range of an average high of 55°F (12.8°C) and an average low of 41.7°F (5.4°C).

Temperature

In Ketchikan, the average high-temperature slightly increases, from a frosty 49.3°F (9.6°C) in April, to a fresh 55°F (12.8°C). In Ketchikan, the average low-temperature is 41.7°F (5.4°C).

Rainfall

In Ketchikan, it is raining for 17 days, with typically 9.3" (235mm) of accumulated precipitation. In Ketchikan, Alaska, during the entire year, the rain falls for 229 days and collects up to 153.2" (3892.3mm) of precipitation.

Snowfall

Months with snowfall in Ketchikan are January through May, October through December. May is the last month it regularly snows. Throughout May, Ketchikan aggregates 0.1" (2.5mm) of snow. Throughout the year, in Ketchikan, 39.5" (1003.2mm) of snow is accumulated.

Ocean temperature

In May, the average ocean temperature in Ketchikan is 48°F (8.9°C).
Note: Swimming in 48°F (8.9°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The average length of the day in May is 16.3h.

Sunshine

With an average of 6h of sunshine, May has the most sunshine of the year in Ketchikan.

UV index

In May, the average daily maximum UV index in Ketchikan is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Ketchikan?

The average high-temperature, in May, is 55°F (12.8°C), while the average low-temperature is 41.7°F (5.4°C).

How many days does it rain in May in Ketchikan?

In Ketchikan, Alaska, during May, the rain falls for 17 days and regularly aggregates up to 9.3" (235mm) of precipitation.

What is the last month it snows in Ketchikan?

May is the last month it regularly snows in Ketchikan. Throughout May, Ketchikan aggregates 0.1" (2.5mm) of snow.

What is the ocean temperature in May in Ketchikan?

In May, the average ocean temperature in Ketchikan 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.

How many hours of daylight does Ketchikan have in May?

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

What month has the most sunshine in Ketchikan?

May has the most sunshine of the year, with an average of 6h of sunshine.

How long on average sun shines in May in Ketchikan?

The average sunshine in May in Ketchikan, Alaska, is 6h.

What is the UV index intensity in May in Ketchikan?

The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in May - Ketchikan, AK
  • Average high temperature in May: 55.1°F

The warmest month (with the highest average high temperature) is August (64.5°F).
The month with the lowest average high temperature is January (38.4°F).

  • Average low temperature in May: 41.8°F

The month with the highest average low temperature is August (52.1°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).

Average rainfall in May - Ketchikan, AK
  • Average rainfall in May: 9.3"

The wettest month (with the highest rainfall) is October (22.2").
Driest months (with the lowest rainfall) are June and July (7.4").

Average rainfall days in May - Ketchikan, AK
  • Average rainfall days in May: 17 days

The month with the highest number of rainy days is October (24 days).
The month with the lowest number of rainy days is July (15 days).

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

The month with the highest snowfall is January (13.3").
Months with the lowest snowfall are June, July, August and September (0").

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).

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 shortest days is December (Average daylight: 7.2h).

  • Average sunshine in May: 6h

The month with most sunshine is May (Average sunshine: 6h).
The month with least sunshine is December (Average sunshine: 1h).

Average UV index in May - Ketchikan, AK
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).