Portland, OR Climate

Summary Graph

The summary climate graph for Portland, OR shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Portland, OR.

Temperature

The warmest month in Portland International, Portland, Oregon is August with an average high temperature of 81.4°F. The hottest day on record was July 2 1942 when the temperature hit 107.2°F. During January the overnight temperature drops to an average of 34.0°F with the lowest temperature of -2.0°F being recorded on January 31 1950.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

2 Jul 1942107.2°F
11 Aug 1981106.9°F
30 Jul 2009106°F
3 Sep 1988105.1°F
17 Aug 1977104°F

The warmest months on average were:

July 198589.7°F
July 200989.4°F
August 198688.5°F
August 198187.4°F
July 199686.5°F

The coldest days on record are:

31 Jan 1950-2°F
2 Feb 1950-0.9°F
26 Jan 19577°F
17 Dec 19648.1°F
6 Feb 19899°F

The coldest months on average were:

January 194922.6°F
January 195023.3°F
January 193723.7°F
January 197924.6°F
December 198525.5°F

Rain

The wettest month in Portland, OR is December with an average of 3.6 inches of rain falling on 20 to 21 days. The driest month in Portland, OR is July with an average of 0.5 inches of rain falling on 5 to 6 days.

Wettest Days

The wettest days on record are:

27 September 19962.5 inches
20 September 19822 inches
8 September 20101.5 inches
10 September 19851.5 inches
26 September 19861.4 inches

Wettest Months

The wettest months on record are:

November 200611.9 inches
December 197711.5 inches
November 197311.4 inches
January 200610.4 inches
November 199510.3 inches

Driest Months

The driest months on record are:

May 19380 inches
January 19440 inches
January 19500 inches
February 19610 inches
October 19360 inches