May weather forecast
Juneau, AK

Blooming fireweed in Juneau, Alaska with snowy mountain peaks in the distance
Blooming fireweed in Juneau, Alaska with snowy mountain peaks in the distance

Weather in May

The last month of the spring, May, is a chilly month in Juneau, Alaska, with an average temperature ranging between min 35.2°F (1.8°C) and max 47.5°F (8.6°C).

Temperature

In May, the average high-temperature rises from a wintry 37°F (2.8°C) in April to a frosty 47.5°F (8.6°C). The average low-temperature, in Juneau, is 35.2°F (1.8°C).

Humidity

With an average relative humidity of 86%, May is the least humid month in Juneau.

Rainfall

May is the month with the least rainfall. Rain falls for 18.5 days and accumulates 4.13" (105mm) of precipitation.

Snowfall

Months with snowfall in Juneau are January through May, October through December. May is the last month it regularly snows. During 3.2 snowfall days, in May, Juneau aggregates 3.31" (84mm) of snow. In Juneau, Alaska, during the entire year, snow falls for 126.6 days and aggregates up to 290.12" (7369mm) of snow.

Ocean temperature

In Juneau, Alaska, the average water temperature is 44.2°F (6.8°C).
Note: Swimming in 44.2°F (6.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In May, the average length of the day is 16h and 50min.
On the first day of May in Juneau, sunrise is at 5:02 am and sunset at 8:47 pm. On the last day of the month, sunrise is at 4:02 am and sunset at 9:48 pm AKDT.

Sunshine

The average sunshine in May in Juneau is 6.2h.

UV index

May and July, with an average maximum UV index of 3, are months with the highest UV index in Juneau. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 3 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for the 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 least humid month in Juneau?

The least humid month in Juneau, Alaska, is May, with an average relative humidity of 86%.

What is the average humidity in May in Juneau?

The average relative humidity in May is 86%.

What is the driest month in Juneau?

May is the month with the least rainfall in Juneau. Rain falls for 18.5 days and accumulates 4.13" (105mm) of precipitation.

How many days does it rain in May in Juneau?

In Juneau, in May, during 18.5 rainfall days, 4.13" (105mm) of precipitation is typically accumulated.

What is the last month it snows in Juneau?

May is the last month it regularly snows in Juneau, Alaska. During 3.2 snowfall days, in May, Juneau aggregates 3.31" (84mm) of snow.

How cold is the water in May in Juneau?

In Juneau, Alaska, the average seawater temperature in May is 44.2°F (6.8°C). Swimming in 44.2°F (6.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

In May, the average day length is 16h and 50min.

When are sunrise and sunset in May in Juneau?

On the first day of May in Juneau, Alaska, sunrise is at 5:02 am and sunset at 8:47 pm. On the last day of the month, sunrise is at 4:02 am and sunset at 9:48 pm AKDT.

How many hours of sunshine does Juneau have in May?

The average sunshine duration in May is 6.2h.

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

May and July, with an average maximum UV index of 3, are months with the highest UV index in Juneau, Alaska.

How high is the UV index in May in Juneau?

The average daily maximum UV index in May in Juneau, Alaska, is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Juneau, AK

Average temperature in May - Juneau, AK
  • Average high temperature in May: 47.5°F

The warmest month (with the highest average high temperature) is July (55.8°F).
The months with the lowest average high temperature are January and December (25.7°F).

  • Average low temperature in May: 35.2°F

The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).

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Average pressure in May
Juneau, AK

Average pressure in May - Juneau, AK
  • Average pressure in May: 29.99"Hg

The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).

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Average wind speed in May
Juneau, AK

Average wind speed in May - Juneau, AK
  • Average wind speed in May: 4.1mph

The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).

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Average humidity in May
Juneau, AK

Average humidity in May - Juneau, AK
  • Average humidity in May: 86%

The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).

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Average rainfall in May
Juneau, AK

Average rainfall in May - Juneau, AK
  • Average rainfall in May: 4.13"

The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the least rainfall) is May (4.13").

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Average rainfall days in May
Juneau, AK

Average rainfall days in May - Juneau, AK
  • Average rainfall days in May: 18.5 days

The month with the highest number of rainy days is September (21.9 days).
The month with the least rainy days is February (4.8 days).

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Average snowfall in May
Juneau, AK

Average snowfall in May - Juneau, AK
  • Average snowfall in May: 3.31"

The month with the highest snowfall is December (62.8").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Juneau, AK

Average snowfall days in May - Juneau, AK
  • Average snowfall days in May: 3.2 days

The month with the highest number of snowfall days is January (21.9 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
Juneau, AK

Average sea temperature in May - Juneau, AK
  • Average sea temperature in May: 44.1°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is March (40.3°F).

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Average daylight in May /
Average sunshine in May
Juneau, AK

Average daylight in May / Average sunshine in May - Juneau, AK
  • Average daylight in May: 16h and 50min

The month with the longest days is June (Average daylight: 18h and 9min).
The month with the shortest days is December (Average daylight: 6h and 31min).

  • Average sunshine in May: 6h and 12min

The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).

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Average sunshine days in May
Juneau, AK

Average sunshine days in May - Juneau, AK
  • Average sunshine days in May: 10 days

The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).

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Average UV index in May
Juneau, AK

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

The months with the highest UV index are May and July (UV index 3).
The months with the lowest UV index are January, April, October, November and December (UV index 1).

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Average cloud cover in May
Juneau, AK

Average cloud cover in May - Juneau, AK
  • Average cloud cover in May: 61

The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).

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Average visibility in May
Juneau, AK

Average visibility in May - Juneau, AK
  • Average visibility in May: 4mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).

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