Seattle Temperatures: Averages by Month

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The numbers here tell you how hot and cold the weather usually is in Seattle, Washington during each month of the year.

The average high and low temperatures are listed below monthly and annually for Seattle, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 60, 70 or 80 °F each month in Seattle, scroll down farther. There are also monthly and yearly counts of days with cold weather.

All the numbers are averages, based on climate data gathered from 1981 to 2010 at Seattle's Husky Stadium, located near downtown Seattle at the University of Washington on the shore of Lake Washington's Union Bay.

Average Seattle temperatures
High °F Low °F   High °C Low °C
49 37 January   9   3
51 37 February 11   3
55 40 March 13   4
60 43 April 16   6
66 49 May 19   9
71 53 June 22 12
76 57 July 24 14
76 57 August 25 14
71 53 September 22 12
61 47 October 16   8
52 41 November 11   5
47 36 December   8   2
61 46 Year 16   8

Days of Hot Weather in Seattle

Sweltering weather is a rarity in Seattle. The city averages only two days a year of temperatures in the 90s Fahrenheit and normally doesn’t get any hotter than 100.

Nights are equally moderate with minimum temperatures dropping below 70 °F. Just ten times a year, on average does the daily low remain in the 60s.

June through to September are the months when Seattle is most likely to have days with highs in the 80s and lows in the 60s.

Days per month in Seattle of at least 60, 70 or 80 °F
  60 °F
16 °C
70 °F
21 °C
80 °F
27 °C
January     1   0   0
February     2   0   0
March     6   0   0
April   13   2   0
May   24   9   1
June   30 15   3
July   31 25   8
August   31 26   9
September   29 16   3
October   16   2   0
November     2   0   0
December     0   0   0
Year 184 93 24

How Often Seattle Has Cold Temperatures

Despite its northern US location, Seattle enjoys mild temperatures. The Pacific Ocean moderates the climate of this coastal city.

Seattle averages just one chilly day annually, normally in December. On this coldest day of the year the thermometer drops to 20 degrees F or less and the day's highest temperature doesn't break the freezing point.

Days per month on average in Seattle when the minimum temperature drops to 32 or 40 °F or below
  32 °F
0 °C
40 °F
4 °C
January   6 20
February   5 18
March   2 16
April   0   7
May   0   1
June   0   0
July   0   0
August   0   0
September   0   0
October   0   2
November   3 13
December   8 23
Year 23 99
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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