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

With the onset of April, Seattle's average high-temperature experiences a slight rise, moving from March's fresh 50.5°F to a refreshing 56.5°F. In Seattle, April is marked by an average low-temperature of 40.5°F.

Humidity

The average relative humidity in April is 79%.

Rainfall

In April, the rain falls for 8.1 days. Throughout April, 0.39" of precipitation is accumulated. Throughout the year, in Seattle, there are 84.2 rainfall days, and 5.2" of precipitation is accumulated.

Snowfall

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

Ocean temperature

In Seattle, the average seawater temperature in April is 45.9°F.
Note: Navigating the 45.9°F at 55.4°F is no joy, and temperatures less than 50°F can threaten breathing and cause a chilling shock, gauging personal stamina.

Daylight

In April, the average length of the day in Seattle is 13h and 41min.
On the first day of the month, sunrise is at 6:47 am and sunset at 7:38 pm. On the last day of April, in Seattle, 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 of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In April, the maximum UV index of 3 suggests these recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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FAQ

What is the temperature in April in Seattle?

An average high-temperature, in April, in Seattle, is 56.5°F and the average low-temperature is 40.5°F.

What is the average humidity in April in Seattle?

The average relative humidity in April is 79%.

How much does it rain in Seattle in April?

In Seattle, in April, during 8.1 rainfall days, 0.39" of precipitation is typically 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, Washington, it doesn't snow. March is the latest month when it typically snows.

How cold is the water in April in Seattle?

In April, the average ocean temperature is 45.9°F. Swimming in 45.9°F is considered dangerous. Unprotected immersion in temperatures below 50°F causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Seattle have in April?

In April, the average day length in Seattle, Washington, 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 many hours of sunshine does Seattle have in April?

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

What is the UV index reading in April in Seattle?

In Seattle, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAprilMJJASOND
Mar
April
May
Average high temperature
50.5°F
56.5°F
64.8°F
Average low temperature
37.4°F
40.5°F
44.8°F
Average pressure
30.01"Hg
30.04"Hg
30.02"Hg
Average wind speed
5.3mph
4.7mph
4mph
Average max. wind speed
5.7mph
5.3mph
4.5mph
Average wind speed gusts
8.5mph
7.2mph
6mph
Average humidity
82%
79%
75%
Average rainfall
0.35"
0.39"
0.39"
Average rainfall days
8.9
8.1
7
Average snowfall
0.08"
0"
0"
Average snowfall days
0.5
0.1
0
Average sea temperature
45.8°F
45.8°F
46.6°F
Average daylight
11h 5min
13h 4min
15h 1min
Average sunshine
6h 2min
8h 1min
9h 1min
Average sunshine days
18.6
18.7
20.3
Average UV index
3
3
4
Average cloud cover
52%
49%
41%
Average visibility
5mi
6mi
6mi

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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