In March, Seattle experiences average highs of 11°C (52°F) and lows of 3°C (37°F). Expect around 18 rainy days and 8 hours of sunshine per day, with humidity averaging 65%.

Get the monthly weather forecast for Seattle, WA, including daily high/low, historical averages, to help you plan ahead.

March marks the beginning of spring in Seattle, with temperatures ranging from 39°F to 54°F (4°C to 12°C). Days continue to lengthen, with around 12 hours of daylight. While rain showers are still common, they begin to decrease, with an average of 3 inches (76 mm) of precipitation.

Discover the wet and cloudy March weather in Seattle, with detailed charts for temperature, rainfall, cloud cover, humidity, daylight, and wind.

March in Seattle brings low temperatures around 12°C during the day, dropping to 4°C at night, with quite a bit of rainfall expected, averaging around 124 mm for the month.

This page gives detailed information on the typical March 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.

The chart illustrates March temperature patterns in Seattle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.

Climate normals for Seattle, United States in March — average temperature, rainfall, sunshine hours, humidity, sea temperature and more.

The numbers here describe what the March weather in Seattle, Washington was like for every year since 2010. A series of tables gives March data by year for temperature, precipitation and snowfall. They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius.

It features all historical weather data series we have available, including the Seattle temperature history for March 2025. You can drill down from year to month and even day level reports by clicking on the graphs.