Weather on May 20
Portland, OR
55 Years of Data
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 56 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.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 68° | 50° | 59° | — | — |
| 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" | — |
Portland, OR Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Portland, OR Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Portland, OR Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Portland, OR
Portland, OR has no months that meet our "pleasant" threshold — every season has tradeoffs.