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

April 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
April is a frosty spring month in Juneau, Alaska, with average temperature fluctuating between 33.3°F (0.7°C) and 48.4°F (9.1°C).

Temperature

In Juneau, the average high-temperature slightly increases, from a cold 39.6°F (4.2°C) in March, to a frosty 48.4°F (9.1°C). In April, the average low-temperature is 33.3°F (0.7°C).

Humidity

The average relative humidity in April is 76.8%.

Rainfall

The month with the least rainfall in Juneau is April when the rain falls for 17 days and typically collects 2.9" (74.7mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. April is the last month it regularly snows. During 1.3 snowfall days, Juneau aggregates 1.1" (27.9mm) of snow. Throughout the year, there are 43.1 snowfall days, and 86.7" (2202mm) of snow is accumulated.

Ocean temperature

In Juneau, the average water temperature is 41.4°F (5.2°C).
Note: Swimming in 41.4°F (5.2°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

The average length of the day in Juneau is 14.5h.

Sunshine

In April, the average sunshine is 6.1h.

UV index

The average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In April, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.

What is the temperature in April in Juneau?

In April, in Juneau, Alaska, the average high-temperature is 48.4°F (9.1°C), and the average low-temperature is 33.3°F (0.7°C).

What is the average humidity in April in Juneau?

In April, the average relative humidity in Juneau is 76.8%.

How much does it rain in Juneau in April?

In April, in Juneau, the rain falls for 17 days. Throughout April, 2.9" (74.7mm) of precipitation is accumulated.

What is the driest month in Juneau?

April is the month with the least rainfall in Juneau. Rain falls for 17 days and accumulates 2.9" (74.7mm) of precipitation.

What is the last month it snows in Juneau?

April is the last month it regularly snows in Juneau. During 1.3 snowfall days, in April, Juneau aggregates 1.1" (27.9mm) of snow.

What is the ocean temperature in April in Juneau?

In Juneau, Alaska, the average seawater temperature in April is 41.4°F (5.2°C). Swimming in 41.4°F (5.2°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 April in Juneau?

The average length of the day in April is 14.5h.

How long on average sun shines in April in Juneau?

The average sunshine in April is 6.1h.

How high is the UV index in April in Juneau?

The average daily maximum UV index in April in Juneau is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.
Average temperature in April - Juneau, AK
  • Average high temperature in April: 9.1°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 April: 0.7°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 April - Juneau, AK
  • Average humidity in April: 76.8%

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 April - Juneau, AK
  • Average rainfall in April: 74.7mm

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 April - Juneau, AK
  • Average rainfall days in April: 17 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 April - Juneau, AK
  • Average snowfall in April: 27.9mm

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 April - Juneau, AK
  • Average snowfall days in April: 1.3 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 April - Juneau, AK
  • Average sea temperature in April: 5.2°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 April / Average sunshine in April - Juneau, AK
  • Average daylight in April: 14.5h

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 April: 6.1h

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

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).