Seattle Weather in April

April is a month of moderate weather for Seattle, Washington. As spring progresses, the city becomes sunnier and drier, yet the temperatures remain mild.

This page gives detailed information on the typical April temperature, precipitation, sun, humidity, wind and storms for Seattle. The weather measurements are averages based on climate data gathered at Seattle — Tacoma International Airport, located south of the city center.

Temperature Weather iconTemperature

59 °F April average high 15 °C
43 °F April average low 6 °C
11 days 60 °F max. or more (16 °C)
9 days 40 °F min. or less (4 °C)

The temperature rises nearly every day during April to over 50 degrees Fahrenheit (10 degrees Celsius) in Seattle. The city averages 2 days this month when the thermometer reaches into the 70s °F (over 21 °C). Temperatures above 80 °F (27 °C) rarely occur here during April.

The thermometer dips to freezing during April only about once a decade .

Rainy Weather iconRain

3.2 in total precipitation 81 mm
15 days of rain

Half the time, Seattle receives 1.9 to 4.3 inches (49 to 108 mm) of rainfall in April. One in four years has drier weather, while another one in four is wetter.

Sunny Weather iconSun

47 % sunshine
5 days clear skies

The sun's rays reach the ground in Seattle during 47 percent of daylight hours on average in April, for a total of 193 hours in the month. Typically on 5 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in April at Seattle lasts for 13 hours and 40 minutes a day on average. The shortest day of the month is the 1st with 12 hours and 52 minutes of daylight. By the end of the month, the days have lengthened to 14:27 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

71 % April average humidity

The relative humidity in Seattle during April usually peaks at 83 percent in the morning then drops to 57 percent by late afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 79 83 82 71 60 57 65 74

Windy Weather iconWind

9.3 mph April wind speed average 15.0 kph

April is windier than most other months in Seattle.

Stormy Weather iconStorms

2 days rainfall of 0.5 inches (13 mm) or more
1 day with thunderstorms in April

April is one of the months when Seattle is most likely to have a thunderstorm. Still, thunder and lightning don't happen here every year during April.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

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