April weather forecast
Seattle, WA

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

Weather in April

April’s warmer temperatures and lower humidity make it a pleasant time for outdoor activities in Seattle. Temperatures typically begin to show a consistent rise, signaling a move away from the winter chill. The reduction in cloud cover accompanying the change in seasons often creates breathtaking sunrise and sunset views from the city’s many vantage points. Rainfall also tends to decrease, turning the city’s famous drizzle into a rare event. Seattleites eagerly welcome the increased sunshine, a delightful change from the long winter period.

Temperature

Seattle experiences a minor temperature shift with the start of April, with average high-temperatures moving from a cool 50.5°F (10.3°C) in March to a mild 56.5°F (13.6°C). Seattle, in April, witnesses an average low-temperature of 40.5°F (4.7°C).

Humidity

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

Rainfall

In Seattle, in April, it is raining for 8.1 days, with typically 0.39" (10mm) of accumulated precipitation. 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 in April through October and December.

Ocean temperature

In Seattle, Washington, the average seawater temperature in April is 45.9°F (7.7°C).
Note: In 45.9°F (7.7°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).

Daylight

In Seattle, the average length of the day in April is 13h and 41min.
On the first day of April in Seattle, sunrise is at 6:45 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:20 pm PDT.

Sunshine

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

UV index

In April, the average daily maximum UV index in Seattle is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 3 during April translates into the following directions:
Act with care - The suggestion to avoid sunburn is emphasized. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What are April temperatures 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 Seattle, in April, during 8.1 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

When it does not snow in Seattle?

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

Does it snow in Seattle in April?

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

What is the ocean temperature in April in Seattle?

In Seattle, Washington, in April, the average water temperature is 45.9°F (7.7°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 April in Seattle?

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

What time are sunrise and sunset in April in Seattle?

In April, on the first day of the month, sunrise is at 6:45 am and sunset at 7:39 pm. On the last day of the month, in Seattle, sunrise is at 5:52 am and sunset at 8:20 pm PDT.

How many hours of sunshine does Seattle have in April?

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

How high is the UV index in April in Seattle?

The average daily maximum UV index in April in Seattle is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in April: 8h and 1min

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).

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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).

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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).

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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).

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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).

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Seattle, Washington, USA

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