Weather on May 31
Portland, OR
55 Years of Data
Avg High
72°F
Avg Low
52°F
Warmest
1986
77°F avg
Coldest
1976
51°F avg
About This Date
May 31st in Portland, OR typically brings pleasant spring weather, with average highs around 72°F and lows near 52°F. Over 55 years of records, the warmest May 31st was in 1986 (77°F average), while the coldest was 1976 (51°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 31st dates historically, with the wettest May 31st recording 3.81" of rain. The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for May 31st in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 56° | 63° | — | — |
| 2024 | 77° | 48° | 63° | — | — |
| 2023 | 66° | 46° | 56° | — | — |
| 2022 | 78° | 50° | 64° | — | — |
| 2021 | 85° | 57° | 71° | — | — |
| 2020 | 64° | 50° | 57° | 0.03" | — |
| 2019 | 80° | 54° | 67° | — | — |
| 2018 | 62° | 48° | 55° | 0.23" | — |
| 2017 | 73° | 52° | 62° | — | — |
| 2016 | 88° | 56° | 72° | — | — |
| 2015 | 83° | 56° | 69° | — | — |
| 2014 | 75° | 50° | 63° | — | — |
| 2013 | 69° | 49° | 59° | — | — |
| 2012 | 70° | 57° | 63° | 0.08" | — |
| 2011 | 62° | 49° | 55° | 0.13" | — |
| 2010 | 71° | 55° | 63° | 0.61" | — |
| 2009 | 87° | 57° | 72° | — | — |
| 2008 | 71° | 51° | 61° | — | — |
| 2007 | 86° | 54° | 70° | — | — |
| 2006 | 73° | 53° | 63° | 0.08" | — |
| 2005 | 64° | 55° | 60° | 0.53" | — |
| 2004 | 64° | 51° | 58° | — | — |
| 2003 | 73° | 54° | 63° | — | — |
| 2002 | 71° | 48° | 60° | — | — |
| 2001 | 94° | 56° | 75° | — | — |
| 2000 | 57° | 47° | 52° | — | — |
| 1999 | 69° | 52° | 60° | 0.08" | — |
| 1998 | 82° | 51° | 67° | — | — |
| 1997 | 68° | 57° | 63° | 3.81" | — |
| 1996 | 72° | 46° | 59° | — | — |
| 1995 | 77° | 50° | 64° | — | — |
| 1994 | 69° | 54° | 61° | 0.3" | — |
| 1993 | 67° | 57° | 62° | 2.03" | — |
| 1992 | 88° | 57° | 72° | — | — |
| 1991 | 67° | 45° | 56° | — | — |
| 1990 | 64° | 49° | 56° | 0.28" | — |
| 1989 | 79° | 51° | 65° | — | — |
| 1988 | 58° | 51° | 54° | 0.1" | — |
| 1987 | 60° | 47° | 53° | 0.51" | — |
| 1986warmest | 92° | 62° | 77° | — | — |
| 1985 | 60° | 53° | 57° | 0.05" | — |
| 1984 | 64° | 46° | 55° | — | — |
| 1983 | 63° | 54° | 58° | 0.23" | — |
| 1982 | 74° | 53° | 63° | — | — |
| 1981 | 75° | 48° | 62° | — | — |
| 1980 | 69° | 52° | 60° | — | — |
| 1979 | 86° | 55° | 71° | — | — |
| 1978 | 81° | 53° | 67° | — | — |
| 1977 | 64° | 54° | 59° | 1.96" | — |
| 1976coldest | 58° | 45° | 51° | 0.76" | — |
| 1975 | 90° | 56° | 73° | — | — |
| 1974 | 79° | 47° | 63° | — | — |
| 1973 | 67° | 49° | 58° | — | — |
| 1972 | 69° | 54° | 61° | — | — |
| 1971 | 54° | 50° | 52° | 0.46" | — |
55 years of data from PORTLAND KGW-TV