Climate & Temperature > Usa > Seattle, Washington

Seattle, Washington Climate Guide to the Average Weather & Temperatures with Graphs Elucidating Sunshine and Rainfall Data & Information about Wind Speeds & Humidity:

  • Seattle, Washington, Usa latitude & longitude; 47°32'N 122°18'W.
  • Altitude; 4 m (13 ft).
  • The average temperature in Seattle, Washington, Usa is 11.5 °C (53 °F).
  • The range of average monthly temperatures is 13.5 °C.
  • The warmest average max/ high temperature is 24 °C (75 °F) in July & August.
  • The coolest average min/ low temperature is 2 °C (36 °F) in January.
  • Seattle, Washington receives on average 919 mm (36.2 in) of precipitation annually or 77 mm (3.0 in) each month.
  • On balance there are 150 days annually on which greater than 0.1 mm (0.004 in) of precipitation (rain, sleet, snow or hail) occurrs or 12.5 days on an average month.
  • The month with the driest weather is July when on balance 17 mm (0.7 in) of rain, sleet, hail or snow falls across 5 days.
  • The month with the wettest weather is December when on balance 145 mm (5.7 in) of rain, sleet, hail or snow falls across 19 days.
  • Mean relative humidity for an average year is recorded as 70.0% and on a monthly basis it ranges from 60% in May to 81% in December.
  • There is an average range of hours of sunshine in Seattle, Washington of between 1.9 hours per day in December and 10.2 hours per day in July.
  • On balance there are 2044 sunshine hours annually and approximately 5.6 sunlight hours for each day.

Seattle, Washington Climate Graph (Metric | Imperial units)

Seattle, Washington Climate Graph

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Seattle, Washington Weather Averages

  Average Minimum Temperatures in Seattle, Washington, Usa (°C) Average Maximum Temperature in Seattle, Washington, Usa (°C) Seattle, Washington Average Temperature (°C) Average Sea Temp (°C) Average Precipitation/ Rainfall (mm) Wet Days (>0.1 mm) Average Sunlight Hours/ Day Relative Humidity (%) Average Wind Speed in Seattle, Washington (Beaufort) Average Number of Days with Frost  
Weather in Seattle, Washington in January 2 8 5 - 139 19 2.0 78 2 - Average Temperature in Seattle, Washington in January
Weather in Seattle, Washington in February 3 9 6 - 107 15 3.6 75 2 - Average Temperature in Seattle, Washington in February
Weather in Seattle, Washington in March 4 12 8 - 90 16 5.3 69.0 3 - Average Temperature in Seattle, Washington in March
Weather in Seattle, Washington in April 6 15 11 - 55 12 6.9 61 3 - Average Temperature in Seattle, Washington in April
Weather in Seattle, Washington in May 9 19 14 - 40 11 7.6 60 2 - Average Temperature in Seattle, Washington in May
Weather in Seattle, Washington in June 11 21 16 - 36 9 7.8 61 2 - Average Temperature in Seattle, Washington in June
Weather in Seattle, Washington in July 13 24 19 - 17 5 10.2 61 2 - Average Temperature in Seattle, Washington in July
Weather in Seattle, Washington in August 13 24 18.5 - 19 5 8.1 67 2 - Average Temperature in Seattle, Washington in August
Weather in Seattle, Washington in September 11 21 16 - 46 8 6.5 70 2 - Average Temperature in Seattle, Washington in September
Weather in Seattle, Washington in October 8 16 12 - 88 14 4.4 77 2 - Average Temperature in Seattle, Washington in October
Weather in Seattle, Washington in November 5 11 8 - 137 17 2.8 80 2 - Average Temperature in Seattle, Washington in November
Weather in Seattle, Washington in December 3 9 6 - 145 19 1.9 81 2 - Average Temperature in Seattle, Washington in December

Seattle, Washington Climograph/ Climate Chart (imperial)

Seattle, Washington Temperature Chart

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Seattle, Washington Temperatures in Farenheit

  Average Minimum Temperatures in Seattle, Washington, Usa (°F) Average Maximum Temperature in Seattle, Washington, Usa (°F) Average Temperature (°F) Average Sea Temp (°F) Average Precipitation/ Rainfall (in) Wet Days (>0.004 in) Average Sunlight Hours/ Day Relative Humidity (%) Average Wind Speed (Beaufort) Average Number of Days with Frost  
Temperatures in Seattle, Washington in January 36 46 41 - 5.5 19 2.0 78 2 - Climate in Seattle, Washington in January
Temperatures in Seattle, Washington in February 37 48 43 - 4.2 15 3.6 75 2 - Climate in Seattle, Washington in February
Temperatures in Seattle, Washington in March 39 54 46 - 3.5 16 5.3 69 3 - Climate in Seattle, Washington in March
Temperatures in Seattle, Washington in April 43 59 51 - 2.2 12 6.9 61 3 - Climate in Seattle, Washington in April
Temperatures in Seattle, Washington in May 48 66 57 - 1.6 11 7.6 60 2 - Climate in Seattle, Washington in May
Temperatures in Seattle, Washington in June 52 70 61 - 1.4 9 7.8 61 2 - Climate in Seattle, Washington in June
Temperatures in Seattle, Washington in July 55 75 65 - 0.7 5 10.2 61 2 - Climate in Seattle, Washington in July
Temperatures in Seattle, Washington in August 55 75 65 - 0.7 5 8.1 67 2 - Climate in Seattle, Washington in August
Temperatures in Seattle, Washington in September 52 70 61 - 1.8 8 6.5 70 2 - Climate in Seattle, Washington in September
Temperatures in Seattle, Washington in October 46 61 54 - 3.5 14 4.4 77 2 - Climate in Seattle, Washington in October
Temperatures in Seattle, Washington in November 41 52 46 - 5.4 17 2.8 80 2 - Climate in Seattle, Washington in November
Temperatures in Seattle, Washington in December 37 48 43 - 5.7 19 1.9 81 2 - Climate in Seattle, Washington in December

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Climate & Temperature > Usa > Seattle, Washington

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