Portland Temperatures: Averages by Month





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

The average high and low temperatures are listed below monthly and annually for Portland, 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 70, 80 or 90 °F each month in Portland, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for Portland, 2010 to 2019
High °F Low °F   High °C Low °C
46 36 January 8 2
49 37 February 10 3
56 40 March 13 4
62 43 April 17 6
70 49 May 21 9
75 53 June 24 12
82 57 July 28 14
83 58 August 28 15
75 54 September 24 12
64 47 October 18 8
52 41 November 11 5
45 36 December 7 2
63 46 Year 17 8
30-year temperature averages for Portland, 1991 to 2020
High °F Low °F   High °C Low °C
46 37 January 8 3
51 37 February 10 3
56 40 March 14 4
62 43 April 17 6
69 48 May 21 9
74 53 June 23 12
82 57 July 28 14
82 57 August 28 14
76 53 September 24 12
64 46 October 18 8
52 41 November 11 5
46 36 December 8 2
63 46 Year 17 8

Days of Hot Weather in Portland

Portland has seen 90-degree weather show up as early as May and as late as September. On average one day in summer spikes into the 100s F (38 °C).

Days with temperature highs in the 80s generally show up here from May to September. Occasionally, Portland also has a day that hot in April or October.

Days per month in Portland of at least 70, 80 or 90 °F
  70 °F
21 °C
80 °F
27 °C
90 °F
32 °C
January 0 0 0
February 0 0 0
March 1 0 0
April 6 1 0
May 13 5 1
June 20 8 2
July 29 19 6
August 29 19 6
September 22 10 2
October 6 1 0
November 0 0 0
December 0 0 0
Year 127 63 16

How Often Portland Has Cold Temperatures

Chilly nights at Portland, when the thermometer dips below freezing, can occur from November to April. On the coldest nights, it can drop to 20 °F (-7 °C) or below at Portland. But weather that cold only shows up here on an average of once a year.

Typically Portland has a couple of days each year when the daytime temperature doesn't climb above freezing.

 

Days per month on average in Portland when the minimum temperature drops to 40, 32 °F or below
  32 °F
0 °C
40 °F
4 °C
January 8 23
February 7 20
March 3 18
April 1 9
May 0 2
June 0 0
July 0 0
August 0 0
September 0 0
October 0 5
November 3 14
December 8 25
Year 29 116
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Portland Weather
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