Seattle Weather in April

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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 weather for Seattle. You can jump directly to data and descriptions for:

The temperature, precipitation and sunshine numbers here are historical averages based on climate data gathered at Seattle's Husky Stadium, located near downtown Seattle at the University of Washington on the shore of Lake Washington's Union Bay. The rest of the measurements are averages from the Seattle - Tacoma International Airport, located south of the city center.

temperature iconTemperature

60 °F April average high 16 °C
43 °F April average low 6 °C

In most years, Seattle averages a daily maximum temperature for April that's between 58 and 62 degrees Fahrenheit (14 to 17 degrees Celsius). The minimum temperature usually falls between 41 and 45 °F (5 to 7 °C).

The days at Seattle warm steadily during April. By the end of the month, the temperature has climbed around 5 °F (3 °C) above what it was at the start.

13 days 60 °F maximum or above (16 °C)
7 days 40 °F minimum or below (4 °C)

The temperature rises nearly every day during April to over 50 °F (10 °C) 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 only about once a decade during April.

precipitation iconRain

2.8 inches total April precipitation 71 millimetres
14 days of rain

Half the time, Seattle receives 2 to 3 inches (52 to 84 mm) of rainfall in April. One in four years has drier weather, while another one in four is wetter.

sunshine iconSun

47 % sunshine in April
5 days with 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.

humidity 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

wind iconWind

9.3 mph April wind speed average 15.0 kph

April is windier than most other months in Seattle.

lightning cloud 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.

Reference

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

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