May weather forecast and climate
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 average temperature varying between 47.5°F (8.6°C) and 35.2°F (1.8°C).

Temperature

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

Humidity

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

Rainfall

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

Snowfall

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

Ocean temperature

In Juneau, in May, the average water temperature is 44.2°F (6.8°C).
Note: Swimming in 44.2°F (6.8°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 May, the average length of the day in Juneau is 16.8h.

Sunshine

In Juneau, the average sunshine in May 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 value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in May in Juneau?

The average high-temperature, in May, is 47.5°F (8.6°C), while the average low-temperature is 35.2°F (1.8°C).

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?

In May, the average relative humidity in Juneau is 86%.

How many days does it rain in May in Juneau?

In Juneau, during May, the rain falls for 18.5 days and regularly aggregates up to 4.13" (105mm) of precipitation.

What is the driest month in Juneau?

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

What is the last month it snows in Juneau?

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

What is the ocean temperature in May in Juneau?

In Juneau, in May, the average water temperature is 44.2°F (6.8°C). Swimming in 44.2°F (6.8°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 Juneau have in May?

In May, the average length of the day in Juneau is 16.8h.

How long on average sun shines in May in Juneau?

The average sunshine in May in Juneau, Alaska, is 6.2h.

What are the months 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.

How high is the UV index in May in Juneau?

In Juneau, the average daily maximum UV index in May is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in May
Juneau, AK

Average temperature in May - Juneau, AK
  • Average high temperature in May: 8.6°C

The warmest month (with the highest average high temperature) is July (13.2°C).
Months with the lowest average high temperature are January and December (-3.5°C).

  • Average low temperature in May: 1.8°C

The month with the highest average low temperature is July (7.3°C).
The coldest month (with the lowest average low temperature) is February (-8.3°C).

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Average pressure in May
Juneau, AK

Average pressure in May - Juneau, AK
  • Average pressure in May: 1015.7mbar

The month with the highest atmospheric pressure is July (1016.8mbar).
The month with the lowest atmospheric pressure is November (1009.1mbar).

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Average wind speed in May
Juneau, AK

Average wind speed in May - Juneau, AK
  • Average wind speed in May: 6.6km/h

The windiest month (with the highest average wind speed) is January (11.1km/h).
The calmest month (with the lowest average wind speed) is June (5.9km/h).

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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: 105mm

The wettest month (with the highest rainfall) is October (251mm).
The driest month (with the least rainfall) is May (105mm).

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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: 84mm

The month with the highest snowfall is December (1595mm).
Months with the least snowfall are June, July, August and September (0mm).

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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).
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: 6.8°C

The best month for swimming (with the highest average sea temperature) is August (11.9°C).
The coldest month (with the lowest average sea temperature) is March (4.7°C).

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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: 16.8h

The month with the longest days is June (Average daylight: 18.2h).
The month with the shortest days is December (Average daylight: 6.5h).

  • Average sunshine in May: 6.2h

The month with the most sunshine is June (Average sunshine: 6.4h).
The month with the least sunshine is November (Average sunshine: 2.6h).

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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

Months with the highest UV index are May and July (UV index 3).
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

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: 7km

Months with the highest visibility are February, March, May, June, July, August, September, October and November (7km).
Months with the lowest visibility are January, April and December (6km).

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