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

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
May, the last month of the spring, in Juneau, is a mild month, with average temperature varying between 40.6°F (4.8°C) and 56.7°F (13.7°C).

Temperature

In May, the average high-temperature marginally rises, from a chilly 48.4°F (9.1°C) in April, to a moderate 56.7°F (13.7°C). The average low-temperature, in Juneau, is 40.6°F (4.8°C).

Humidity

The least humid month is May, with an average relative humidity of 76.3%.

Rainfall

In Juneau, in May, it is raining for 16.3 days, with typically 3.4" (86.4mm) of accumulated precipitation. In Juneau, Alaska, during the entire year, the rain falls for 229.8 days and collects up to 62.3" (1581.6mm) of precipitation.

Snowfall

In May, it doesn't snow. April is the latest month when it typically snows. In Juneau, Alaska, during the entire year, snow aggregates up to 86.7" (2202mm).

Ocean temperature

In May, the average ocean temperature is 44.2°F (6.8°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.

Daylight

The average length of the day in Juneau, Alaska, is 16.8h.

Sunshine

With an average of 7.5h of sunshine, May has the most sunshine of the year.

UV index

In May, the average daily maximum UV index in Juneau is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
The average daily UV index of 4 in May transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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.

What is the temperature in May in Juneau?

The average high-temperature, in May, in Juneau, is 56.7°F (13.7°C), while the average low-temperature is 40.6°F (4.8°C).

What is the least humid month in Juneau?

The least humid month in Juneau is May, with an average relative humidity of 76.3%.

What is the average humidity in May in Juneau?

In Juneau, Alaska, the average relative humidity in May is 76.3%.

How many days does it rain in May in Juneau?

In May, in Juneau, Alaska, the rain falls for 16.3 days. Throughout May, 3.4" (86.4mm) of precipitation is accumulated.

Does it snow in Juneau in May?

In May, in Juneau, Alaska, it doesn't snow. April is the latest month when it typically snows.

How cold is the water in May in Juneau?

In Juneau, in May, the average water temperature is 44.2°F (6.8°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 Juneau?

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

What month has the most sunshine in Juneau?

The month with the most sunshine is May, with an average of 7.5h of sunshine.

How many hours of sunshine does Juneau have in May?

The average sunshine in May is 7.5h.

What is the UV index reading in May in Juneau?

In Juneau, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in May - Juneau, AK
  • Average high temperature in May: 13.7°C

The warmest month (with the highest average high temperature) is July (17.7°C).
The month with the lowest average high temperature is January (0.4°C).

  • Average low temperature in May: 4.8°C

The month with the highest average low temperature is July (10°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

Average humidity in May - Juneau, AK
  • Average humidity in May: 76.3%

The month with the highest relative humidity is September (87.9%).
The month with the lowest relative humidity is May (76.3%).

Average rainfall in May - Juneau, AK
  • Average rainfall in May: 86.4mm

The wettest month (with the highest rainfall) is September (219.5mm).
The driest month (with the lowest rainfall) is April (74.7mm).

Average rainfall days in May - Juneau, AK
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is October (23.9 days).
The month with the lowest number of rainy days is June (15.8 days).

Average snowfall in May - Juneau, AK
  • Average snowfall in May: 0mm

The month with the highest snowfall is January (703.6mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in May - Juneau, AK
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (10.6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

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).

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 shortest days is December (Average daylight: 6.5h).

  • Average sunshine in May: 7.5h

The month with most sunshine is May (Average sunshine: 7.5h).
The month with least sunshine is December (Average sunshine: 1.3h).

Average UV index in May - Juneau, AK
  • Average UV index in May: 4

Months with the highest UV index are June and July (UV index 5).
Months with the lowest UV index are January, November and December (UV index 0).