April weather forecast
Seattle, WA

Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington

Weather in April

April in Seattle, Washington, is a moderate spring month, with an average temperature varying between 56.5°F (13.6°C) and 40.5°F (4.7°C).

Temperature

In Seattle, the average high-temperature in April slightly increases from a fresh 50.5°F (10.3°C) in March to a mild 56.5°F (13.6°C). In Seattle, the average low-temperature is 40.5°F (4.7°C).

Humidity

The average relative humidity in April in Seattle is 79%.

Rainfall

In Seattle, in April, during 8.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In Seattle, during the entire year, the rain falls for 84.2 days and collects up to 5.2" (132mm) of precipitation.

Snowfall

In Seattle, snow does not fall through October and December.

Ocean temperature

In Seattle, the average seawater temperature in April is 45.9°F (7.7°C).
Note: Swimming in 45.9°F (7.7°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 April, the average length of the day is 13h and 41min.
On the first day of April in Seattle, Washington, sunrise is at 6:47 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:53 am and sunset at 8:19 pm PDT.

Sunshine

In Seattle, the average sunshine in April is 8.1h.

UV index

In Seattle, the average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 3 in April interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
[Resources]

FAQ

What is the temperature in April in Seattle?

The average high-temperature, in April, in Seattle, is 56.5°F (13.6°C), while the average low-temperature is 40.5°F (4.7°C).

What is the average humidity in April in Seattle?

In Seattle, the average relative humidity in April is 79%.

How many days does it rain in April in Seattle?

In April, in Seattle, Washington, the rain falls for 8.1 days. Throughout April, 0.39" (10mm) of precipitation is accumulated.

When it does not snow in Seattle?

April through October and December are months without snowfall.

Does it snow in Seattle in April?

In April, in Seattle, it doesn't snow. March is the latest month when it typically snows.

How cold is the water in April in Seattle?

In Seattle, in April, the average water temperature is 45.9°F (7.7°C). Swimming in 45.9°F (7.7°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 Seattle?

In Seattle, the average day length in April is 13h and 41min.

When are sunrise and sunset in April in Seattle?

In April, on the first day of the month, sunrise is at 6:47 am and sunset at 7:38 pm. On the last day of the month, in Seattle, Washington, sunrise is at 5:53 am and sunset at 8:19 pm PDT.

How long on average sun shines in April in Seattle?

In April, the average sunshine duration is 8.1h.

How high is the UV index in April in Seattle?

In April, the average daily maximum UV index in Seattle, Washington, is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Seattle, WA

Average temperature in April - Seattle, WA
  • Average high temperature in April: 56.5°F

The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).

  • Average low temperature in April: 40.5°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).

[Resources]

Average pressure in April
Seattle, WA

Average pressure in April - Seattle, WA
  • Average pressure in April: 30.04"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

[Resources]

Average wind speed in April
Seattle, WA

Average wind speed in April - Seattle, WA
  • Average wind speed in April: 4.7mph

The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).

[Resources]

Average humidity in April
Seattle, WA

Average humidity in April - Seattle, WA
  • Average humidity in April: 79%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).

[Resources]

Average rainfall in April
Seattle, WA

Average rainfall in April - Seattle, WA
  • Average rainfall in April: 0.39"

The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").

[Resources]

Average rainfall days in April
Seattle, WA

Average rainfall days in April - Seattle, WA
  • Average rainfall days in April: 8.1 days

The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).

[Resources]

Average snowfall in April
Seattle, WA

Average snowfall in April - Seattle, WA
  • Average snowfall in April: 0"

The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").

[Resources]

Average snowfall days in April
Seattle, WA

Average snowfall days in April - Seattle, WA
  • Average snowfall days in April: 0.1 days

The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

[Resources]

Average sea temperature in April
Seattle, WA

Average sea temperature in April - Seattle, WA
  • Average sea temperature in April: 45.8°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 February (45.3°F).

[Resources]

Average daylight in April /
Average sunshine in April
Seattle, WA

Average daylight in April / Average sunshine in April - Seattle, WA
  • Average daylight in April: 13h and 41min

The month with the longest days is June (Average daylight: 15h and 55min).
The month with the shortest days is December (Average daylight: 8h and 31min).

  • Average sunshine in April: 8h and 6min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

[Resources]

Average sunshine days in April
Seattle, WA

Average sunshine days in April - Seattle, WA
  • Average sunshine days in April: 18.7 days

The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).

[Resources]

Average UV index in April
Seattle, WA

Average UV index in April - Seattle, WA
  • Average UV index in April: 3

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

[Resources]

Average cloud cover in April
Seattle, WA

Average cloud cover in April - Seattle, WA
  • Average cloud cover in April: 49

The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).

[Resources]

Average visibility in April
Seattle, WA

Average visibility in April - Seattle, WA
  • Average visibility in April: 6mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location