Weather on May 20
Portland, OR
55 Years of Data
Avg High
67°F
Avg Low
49°F
Warmest
1978
73°F avg
Coldest
2010
49°F avg
About This Date
May 20th in Portland, OR typically brings mild spring weather, with average highs around 67°F and lows near 49°F. Over 55 years of records, the warmest May 20th was in 1978 (73°F average), while the coldest was 2010 (49°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 38% of May 20th dates historically, with the wettest May 20th recording 1.63" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 20th in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 62° | 48° | 55° | 0.1" | — |
| 2024 | 66° | 42° | 54° | — | — |
| 2023 | 80° | 56° | 68° | — | — |
| 2022 | 60° | 42° | 51° | — | — |
| 2021 | 59° | 42° | 51° | 0.13" | — |
| 2020 | 59° | 50° | 55° | 0.08" | — |
| 2019 | 62° | 51° | 57° | 0.03" | — |
| 2018 | 69° | 55° | 62° | — | — |
| 2017 | 71° | 53° | 62° | — | — |
| 2016 | 65° | 48° | 56° | — | — |
| 2015 | 74° | 53° | 63° | — | — |
| 2014 | 73° | 50° | 62° | — | — |
| 2013 | 73° | 47° | 60° | — | — |
| 2012 | 65° | 55° | 60° | 0.18" | — |
| 2011 | 74° | 45° | 59° | — | — |
| 2010coldest | 55° | 42° | 49° | 1.57" | — |
| 2009 | 65° | 42° | 53° | — | — |
| 2008 | 69° | 51° | 60° | 0.61" | — |
| 2007 | 54° | 48° | 51° | 0.74" | — |
| 2006 | 74° | 55° | 64° | — | — |
| 2005 | 62° | 48° | 55° | 0.66" | — |
| 2004 | 69° | 51° | 60° | — | — |
| 2003 | 66° | 51° | 59° | — | — |
| 2002 | 58° | 51° | 54° | 0.3" | — |
| 2001 | 71° | 42° | 57° | — | — |
| 2000 | 78° | 52° | 65° | — | — |
| 1999 | 60° | 46° | 53° | — | — |
| 1998 | 56° | 50° | 53° | 1.63" | — |
| 1997 | 68° | 49° | 58° | — | — |
| 1996 | 65° | 45° | 55° | 0.08" | — |
| 1995 | 79° | 52° | 65° | — | — |
| 1994 | 61° | 53° | 57° | — | — |
| 1993 | 73° | 51° | 62° | 0.48" | — |
| 1992 | 63° | 48° | 55° | — | — |
| 1991 | 66° | 51° | 59° | — | — |
| 1990 | 60° | 48° | 54° | 0.18" | — |
| 1989 | 69° | 47° | 58° | — | — |
| 1988 | 76° | 47° | 61° | — | — |
| 1987 | 70° | 46° | 58° | — | — |
| 1986 | 58° | 49° | 53° | 0.41" | — |
| 1985 | 62° | 54° | 58° | — | — |
| 1984 | 57° | 46° | 52° | 0.23" | — |
| 1983 | 80° | 52° | 66° | — | — |
| 1982 | 78° | 52° | 65° | — | — |
| 1981 | 61° | 51° | 56° | 0.33" | — |
| 1980 | 79° | 52° | 65° | — | — |
| 1979 | 82° | 55° | 69° | — | — |
| 1978warmest | 89° | 57° | 73° | — | — |
| 1977 | 68° | 49° | 58° | — | — |
| 1976 | 66° | 46° | 56° | — | — |
| 1975 | 69° | 37° | 53° | — | — |
| 1974 | 62° | 46° | 54° | 0.3" | — |
| 1973 | 61° | 45° | 53° | 0.15" | — |
| 1972 | 74° | 53° | 63° | 0.36" | — |
| 1971 | 59° | 44° | 52° | 0.18" | — |
55 years of data from PORTLAND KGW-TV