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 1981 to 2010 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, 1981 to 2010
High °F Low °F   High °C Low °C
47 36 January 8 2
51 37 February 11 3
57 39 March 14 4
62 43 April 16 6
69 48 May 20 9
73 52 June 23 11
81 56 July 27 13
81 57 August 27 14
75 52 September 24 11
64 46 October 18 8
52 41 November 11 5
45 35 December 7 2
63 45 Year 17 7

Days of Hot Weather in Portland

Most of Portland's 90-degree weather is confined to July and August. Although extremely unusual, a hot summer day can spike into the 100s F.

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 5 1 0
May 12 4 1
June 19 7 1
July 28 16 5
August 29 16 5
September 22 9 1
October 5 1 0
November 0 0 0
December 0 0 0
Year 121 53 12

How Often Portland Has Cold Temperatures

Chilly nights when the thermometer dips below freezing can occur from November to March. For a couple of days each year on average, Portland's daytime temperature doesn't climb above freezing.

On the coldest nights, it can drop to 20 °F (-7 °C) or below at Portland. But weather that cold doesn't happen here every year.

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 24
February 6 20
March 3 18
April 0 9
May 0 2
June 0 0
July 0 0
August 0 0
September 0 0
October 0 5
November 2 14
December 8 26
Year 26 118
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. 1981-2010 U.S. Climate Normals. (Data Access. FTP.)

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