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.
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.
The warmest days on record are:
| 2 Jul 1942 | 107.2°F |
| 11 Aug 1981 | 106.9°F |
| 30 Jul 2009 | 106°F |
| 3 Sep 1988 | 105.1°F |
| 17 Aug 1977 | 104°F |
The warmest months on average were:
| July 1985 | 89.7°F |
| July 2009 | 89.4°F |
| August 1986 | 88.5°F |
| August 1981 | 87.4°F |
| July 1996 | 86.5°F |
The coldest days on record are:
| 31 Jan 1950 | -2°F |
| 2 Feb 1950 | -0.9°F |
| 26 Jan 1957 | 7°F |
| 17 Dec 1964 | 8.1°F |
| 6 Feb 1989 | 9°F |
The coldest months on average were:
| January 1949 | 22.6°F |
| January 1950 | 23.3°F |
| January 1937 | 23.7°F |
| January 1979 | 24.6°F |
| December 1985 | 25.5°F |
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.
The wettest days on record are:
| 1 March 2011 | 1.7 inches |
| 27 March 2005 | 1.6 inches |
| 10 March 1983 | 1.3 inches |
| 30 March 2012 | 1.3 inches |
| 12 March 2002 | 1.1 inches |
The wettest months on record are:
| November 2006 | 11.9 inches |
| December 1977 | 11.5 inches |
| November 1973 | 11.4 inches |
| January 2006 | 10.4 inches |
| November 1995 | 10.3 inches |
The driest months on record are:
| May 1938 | 0 inches |
| January 1944 | 0 inches |
| January 1950 | 0 inches |
| February 1961 | 0 inches |
| October 1936 | 0 inches |