Seattle Weather Forecast

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Seattle Washington Weather Forecast

Seattle enjoys a mild and comfortable maritime climate year-round, making it a welcoming destination for tourists who prefer much more moderate temperatures than cities to the east.

Seattle rarely experiences extreme temperatures, with cool summers and mild winters. Tourists won’t have to contend with scorching heat or bitter cold but changing weather conditions and occasional rain, makes pack clothing suitable for layering, including waterproof jackets and comfortable shoes wise.

7 Day Outlook for Seattle

SEATTLE WEATHER

Seasonal Weather for Seattle Washington

Here’s a detailed overview of the average weather conditions in Seattle, Washington, for each season, including temperature ranges, humidity, UV reports, precipitation, sunshine days, pollution, storms, winds, and the frequency of days with temperatures over 90 degrees Fahrenheit:

Spring Forecast (March to May):

  • Temperature Range: Spring in Seattle is mild and gradually warms up. Highs typically range from 53°F (12°C) in March to 63°F (17°C) in May, while nighttime lows range from 39°F (4°C) to 48°F (9°C).
  • Humidity: Humidity levels are moderate in spring, creating comfortable conditions.
  • UV Reports: UV levels are generally low in spring, but sun protection is still advisable on sunny days.
  • Precipitation: Spring is the start of Seattle’s drier season, but it’s still relatively wet. Average monthly rainfall ranges from 2 to 3 inches.
  • Sunshine Days: Seattle begins to see more sunshine in spring, but it also experiences cloudy days.
  • Air Quality/Pollution: Air quality is generally good in Seattle, with minimal pollution.
  • Storms: While spring can bring occasional rain showers and gusty winds, severe storms are infrequent.
  • Winds: Breezy conditions may occur near the coast.
  • Days Over 90 Degrees: Days over 90 degrees Fahrenheit are extremely rare in spring in Seattle, with mild and comfortable temperatures.

Summer (June to August):

  • Temperature Range: Summers in Seattle are mild and pleasant. Highs typically range from 67°F (19°C) to 75°F (24°C), with nighttime lows between 51°F (11°C) and 56°F (13°C).
  • Humidity: Humidity levels are moderate during the summer, contributing to comfortable coastal weather.
  • UV Reports: UV levels are moderate to low in Seattle during the summer, so sun protection is advisable.
  • Precipitation: Summer is the driest season in Seattle, with average monthly rainfall ranging from minimal to around 1 inch.
  • Sunshine Days: Seattle enjoys a good amount of sunshine during the summer months, providing opportunities for outdoor activities.
  • Air Quality/Pollution: Air quality is generally good in the summer, with minimal pollution.
  • Storms: Summer typically brings minimal storms, with occasional rain showers.
  • Winds: Breezy conditions continue near the coast during the summer.
  • Days Over 90 Degrees: Days over 90 degrees Fahrenheit are rare in Seattle, with cool and comfortable summer temperatures.

Fall Season (September to November):

  • Temperature Range: Fall in Seattle is mild and gradually cools down. Highs range from 67°F (19°C) in September to 53°F (12°C) in November, while nighttime lows range from 49°F (9°C) to 41°F (5°C).
  • Humidity: Humidity levels remain moderate in fall, creating pleasant weather.
  • UV Reports: UV levels decrease in the fall, but sun protection is still advisable on sunny days.
  • Precipitation: Fall marks the return of wetter weather, with average monthly rainfall ranging from 2 to 4 inches.
  • Sunshine Days: Fall offers a mix of sunny and overcast days.
  • Air Quality/Pollution: Air quality is generally good in the fall, with minimal pollution.
  • Storms: Fall can bring occasional rain showers and gusty winds, but severe storms are infrequent.
  • Winds: Breezy conditions may occur, especially near the coast.
  • Days Over 90 Degrees: Days over 90 degrees Fahrenheit are extremely rare in fall, with mild and comfortable temperatures.

Winter (December to February):

  • Temperature Range: Winters in Seattle are cool and damp. Highs typically range from 45°F (7°C) to 49°F (9°C), while nighttime lows range from 36°F (2°C) to 38°F (3°C).
  • Humidity: Humidity levels are moderate in winter, creating cool and damp conditions.
  • UV Reports: UV levels are low in winter, but sun protection is still advisable on sunny days.
  • Precipitation: Winter is the wettest season in Seattle, with average monthly rainfall ranging from 4 to 6 inches. Snowfall is rare but possible.
  • Sunshine Days: Seattle experiences more overcast days in winter, with fewer sunny days.
  • Air Quality/Pollution: Air quality is generally good in the winter, with minimal pollution.
  • Storms: Winter can bring rain showers, occasional storms, and gusty winds.
  • Winds: Breezy conditions may occur, especially near the coast.
  • Days Over 90 Degrees: Days over 90 degrees Fahrenheit are extremely rare in winter in Seattle.

Seattle’s weather offers tourists a maritime climate with mild temperatures and moderate humidity throughout the year. Summers are the driest and sunniest, making it an ideal time for outdoor exploration.

See more on this Winter’s weather outlook with reports from NOAA, Accuweather, and Farmer’s Almanac.

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