Weather on May 21
Portland, OR
55 Years of Data
Avg High
68°F
Avg Low
49°F
Warmest
1988
73°F avg
Coldest
2010
49°F avg
About This Date
May 21st in Portland, OR typically brings mild spring weather, with average highs around 68°F and lows near 49°F. Over 55 years of records, the warmest May 21st was in 1988 (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 40% of May 21st dates historically, with the wettest May 21st recording 1.4" of rain. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 49° | 58° | — | — |
| 2024 | 54° | 45° | 49° | 0.89" | — |
| 2023 | 65° | 54° | 59° | — | — |
| 2022 | 71° | 44° | 58° | — | — |
| 2021 | 65° | 44° | 54° | — | — |
| 2020 | 59° | 48° | 54° | 0.58" | — |
| 2019 | 63° | 49° | 56° | 0.18" | — |
| 2018 | 70° | 48° | 59° | — | — |
| 2017 | 82° | 55° | 69° | — | — |
| 2016 | 58° | 50° | 54° | 0.08" | — |
| 2015 | 73° | 58° | 65° | — | — |
| 2014 | 72° | 48° | 60° | — | — |
| 2013 | 58° | 44° | 51° | 1.4" | — |
| 2012 | 60° | 54° | 57° | 1.07" | — |
| 2011 | 62° | 50° | 56° | — | — |
| 2010coldest | 54° | 44° | 49° | 1.09" | — |
| 2009 | 74° | 47° | 60° | — | — |
| 2008 | 60° | 49° | 54° | 0.08" | — |
| 2007 | 60° | 45° | 52° | 0.13" | — |
| 2006 | 74° | 54° | 64° | 0.76" | — |
| 2005 | 61° | 44° | 52° | 0.43" | — |
| 2004 | 62° | 52° | 57° | — | — |
| 2003 | 76° | 52° | 64° | — | — |
| 2002 | 63° | 48° | 55° | 0.56" | — |
| 2001 | 85° | 50° | 67° | — | — |
| 2000 | 80° | 54° | 67° | 0.05" | — |
| 1999 | 67° | 47° | 57° | — | — |
| 1998 | 56° | 48° | 52° | 0.58" | — |
| 1997 | 69° | 48° | 59° | — | — |
| 1996 | 56° | 49° | 52° | 0.84" | — |
| 1995 | 79° | 51° | 65° | — | — |
| 1994 | 69° | 53° | 61° | — | — |
| 1993 | 64° | 55° | 60° | 0.2" | — |
| 1992 | 68° | 42° | 55° | — | — |
| 1991 | 62° | 51° | 57° | — | — |
| 1990 | 67° | 49° | 58° | 0.66" | — |
| 1989 | 59° | 48° | 54° | — | — |
| 1988warmest | 92° | 55° | 73° | — | — |
| 1987 | 74° | 49° | 61° | — | — |
| 1986 | 58° | 45° | 51° | 0.2" | — |
| 1985 | 78° | 48° | 63° | — | — |
| 1984 | 64° | 44° | 54° | — | — |
| 1983 | 73° | 51° | 62° | — | — |
| 1982 | 77° | 49° | 63° | — | — |
| 1981 | 58° | 51° | 54° | 0.15" | — |
| 1980 | 64° | 52° | 58° | 1.09" | — |
| 1979 | 85° | 52° | 68° | — | — |
| 1978 | 83° | 50° | 66° | — | — |
| 1977 | 67° | 53° | 60° | 0.03" | — |
| 1976 | 76° | 46° | 61° | — | — |
| 1975 | 65° | 42° | 53° | — | — |
| 1974 | 71° | 44° | 58° | — | — |
| 1973 | 74° | 44° | 59° | — | — |
| 1972 | 61° | 52° | 56° | 0.61" | — |
| 1971 | 73° | 44° | 59° | — | — |
55 years of data from PORTLAND KGW-TV