Weather on May 15
Portland, OR
55 Years of Data
Avg High
68°F
Avg Low
50°F
Warmest
2023
77°F avg
Coldest
1974
46°F avg
About This Date
May 15th in Portland, OR typically brings mild spring weather, with average highs around 68°F and lows near 50°F. Over 55 years of records, the warmest May 15th was in 2023 (77°F average), while the coldest was 1974 (46°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 49% of May 15th dates historically, with the wettest May 15th recording 1.78" of rain. The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for May 15th in Portland, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 57° | 50° | 54° | 0.18" | — |
| 2024 | 80° | 54° | 67° | — | — |
| 2023warmest | 89° | 65° | 77° | — | — |
| 2022 | 67° | 55° | 61° | 0.56" | — |
| 2021 | 78° | 51° | 65° | — | — |
| 2020 | 68° | 51° | 60° | 0.3" | — |
| 2019 | 63° | 51° | 57° | 0.23" | — |
| 2018 | 70° | 55° | 62° | — | — |
| 2017 | 59° | 44° | 52° | 0.71" | — |
| 2016 | 56° | 52° | 54° | 1.6" | — |
| 2015 | 60° | 50° | 55° | — | — |
| 2014 | 82° | 60° | 71° | — | — |
| 2013 | 58° | 50° | 54° | 0.08" | — |
| 2012 | 77° | 51° | 64° | — | — |
| 2011 | 57° | 47° | 52° | 1.57" | — |
| 2010 | 75° | 50° | 63° | — | — |
| 2009 | 72° | 44° | 58° | — | — |
| 2008 | 85° | 56° | 70° | — | — |
| 2007 | 85° | 54° | 69° | — | — |
| 2006 | 94° | 51° | 72° | — | — |
| 2005 | 65° | 57° | 61° | 1.09" | — |
| 2004 | 59° | 52° | 55° | 0.08" | — |
| 2003 | 57° | 44° | 51° | 0.15" | — |
| 2002 | 62° | 46° | 54° | — | — |
| 2001 | 58° | 49° | 53° | 0.91" | — |
| 2000 | 69° | 49° | 59° | 0.18" | — |
| 1999 | 57° | 45° | 51° | 0.03" | — |
| 1998 | 56° | 45° | 50° | 0.23" | — |
| 1997 | 77° | 60° | 69° | — | — |
| 1996 | 62° | 51° | 57° | 1.78" | — |
| 1995 | 79° | 56° | 67° | — | — |
| 1994 | 61° | 50° | 55° | 0.18" | — |
| 1993 | 79° | 51° | 65° | — | — |
| 1992 | 74° | 47° | 60° | — | — |
| 1991 | 66° | 46° | 56° | — | — |
| 1990 | 62° | 48° | 55° | — | — |
| 1989 | 78° | 51° | 65° | — | — |
| 1988 | 75° | 49° | 62° | 0.03" | — |
| 1987 | 63° | 52° | 57° | — | — |
| 1986 | 64° | 48° | 56° | — | — |
| 1985 | 80° | 45° | 62° | — | — |
| 1984 | 59° | 47° | 53° | 0.13" | — |
| 1983 | 59° | 44° | 52° | 0.64" | — |
| 1982 | 74° | 46° | 60° | — | — |
| 1981 | 59° | 44° | 52° | 0.74" | — |
| 1980 | 59° | 48° | 54° | 0.03" | — |
| 1979 | 78° | 51° | 65° | — | — |
| 1978 | 61° | 47° | 54° | 0.53" | — |
| 1977 | 57° | 45° | 51° | 0.25" | — |
| 1976 | 81° | 48° | 64° | — | — |
| 1975 | 66° | 50° | 58° | — | — |
| 1974coldest | 52° | 40° | 46° | 0.84" | — |
| 1973 | 81° | 58° | 69° | — | — |
| 1972 | 61° | 54° | 57° | 0.2" | — |
| 1971 | 61° | 46° | 53° | 0.13" | — |
55 years of data from PORTLAND KGW-TV