Weather on May 18
Portland, OR
55 Years of Data
Avg High
68°F
Avg Low
49°F
Warmest
2008
72°F avg
Coldest
1974
49°F avg
About This Date
May 18th 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 18th was in 2008 (72°F average), while the coldest was 1974 (49°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 44% of May 18th dates historically, with the wettest May 18th recording 2.44" 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 18th in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 48° | 54° | 0.03" | — |
| 2024 | 59° | 47° | 53° | 0.56" | — |
| 2023 | 84° | 60° | 72° | — | — |
| 2022 | 61° | 46° | 53° | 0.46" | — |
| 2021 | 59° | 49° | 54° | 0.15" | — |
| 2020 | 59° | 51° | 55° | 0.69" | — |
| 2019 | 72° | 50° | 61° | 0.28" | — |
| 2018 | 66° | 52° | 59° | — | — |
| 2017 | 70° | 45° | 57° | — | — |
| 2016 | 73° | 52° | 62° | — | — |
| 2015 | 76° | 51° | 63° | — | — |
| 2014 | 61° | 52° | 56° | 2.44" | — |
| 2013 | 62° | 49° | 55° | 0.48" | — |
| 2012 | 65° | 41° | 53° | — | — |
| 2011 | 71° | 45° | 58° | — | — |
| 2010 | 64° | 53° | 59° | 0.58" | — |
| 2009 | 80° | 51° | 66° | 0.3" | — |
| 2008warmest | 86° | 57° | 72° | — | — |
| 2007 | 73° | 48° | 61° | 0.03" | — |
| 2006 | 84° | 52° | 68° | — | — |
| 2005 | 67° | 52° | 59° | 1.6" | — |
| 2004 | 68° | 55° | 62° | — | — |
| 2003 | 62° | 37° | 50° | — | — |
| 2002 | 65° | 47° | 56° | 0.46" | — |
| 2001 | 64° | 42° | 53° | — | — |
| 2000 | 70° | 49° | 59° | 0.25" | — |
| 1999 | 59° | 51° | 55° | 0.41" | — |
| 1998 | 65° | 49° | 57° | — | — |
| 1997 | 81° | 53° | 67° | — | — |
| 1996 | 60° | 52° | 56° | 0.99" | — |
| 1995 | 64° | 49° | 56° | — | — |
| 1994 | 68° | 49° | 58° | — | — |
| 1993 | 80° | 60° | 70° | — | — |
| 1992 | 74° | 54° | 64° | — | — |
| 1991 | 53° | 46° | 50° | 0.99" | — |
| 1990 | 59° | 48° | 54° | 0.08" | — |
| 1989 | 58° | 43° | 50° | 0.58" | — |
| 1988 | 62° | 47° | 54° | 0.25" | — |
| 1987 | 61° | 44° | 52° | — | — |
| 1986 | 69° | 54° | 61° | — | — |
| 1985 | 73° | 50° | 62° | — | — |
| 1984 | 73° | 48° | 61° | — | — |
| 1983 | 70° | 50° | 60° | — | — |
| 1982 | 60° | 40° | 50° | 0.18" | — |
| 1981 | 63° | 53° | 58° | 0.86" | — |
| 1980 | 78° | 53° | 66° | — | — |
| 1979 | 72° | 52° | 62° | — | — |
| 1978 | 80° | 49° | 64° | — | — |
| 1977 | 61° | 47° | 54° | — | — |
| 1976 | 70° | 44° | 57° | — | — |
| 1975 | 66° | 53° | 60° | — | — |
| 1974coldest | 52° | 46° | 49° | 0.64" | — |
| 1973 | 74° | 51° | 62° | — | — |
| 1972 | 63° | 46° | 54° | 0.25" | — |
| 1971 | 66° | 47° | 56° | — | — |
55 years of data from PORTLAND KGW-TV