Weather on May 18
Hillsboro, OR
55 Years of Data
Avg High
68°F
Avg Low
46°F
Warmest
2023
70°F avg
Coldest
2003
44°F avg
About This Date
May 18th in Hillsboro, OR typically brings mild spring weather, with average highs around 68°F and lows near 46°F. Over 55 years of records, the warmest May 18th was in 2023 (70°F average), while the coldest was 2003 (44°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 47% of May 18th dates historically, with the wettest May 18th recording 1.4" 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 Hillsboro, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 59° | 45° | 52° | — | — |
| 2024 | 61° | 42° | 51° | — | — |
| 2023warmest | 84° | 56° | 70° | — | — |
| 2022 | 61° | 46° | 53° | 0.23" | — |
| 2021 | 63° | 41° | 52° | 0.15" | — |
| 2020 | 61° | 48° | 54° | 0.46" | — |
| 2019 | 70° | 50° | 60° | 0.79" | — |
| 2018 | 66° | 48° | 57° | — | — |
| 2017 | 70° | 42° | 56° | — | — |
| 2016 | 73° | 49° | 61° | — | — |
| 2015 | 77° | 47° | 62° | — | — |
| 2014 | 65° | 52° | 58° | 1.3" | — |
| 2013 | 57° | 44° | 51° | 0.81" | — |
| 2012 | 65° | 34° | 49° | — | — |
| 2011 | 71° | 39° | 55° | — | — |
| 2010 | 65° | 52° | 58° | 0.08" | — |
| 2009 | 79° | 48° | 63° | 0.51" | — |
| 2008 | 85° | 50° | 67° | — | — |
| 2007 | 72° | 40° | 56° | 0.23" | — |
| 2006 | 85° | 47° | 66° | — | — |
| 2005 | 65° | 51° | 58° | 1.12" | — |
| 2004 | 68° | 52° | 60° | 0.03" | — |
| 2003coldest | 55° | 33° | 44° | 0.18" | — |
| 2002 | 66° | 49° | 57° | — | — |
| 2001 | 63° | 40° | 51° | — | — |
| 2000 | 74° | 58° | 66° | 0.2" | — |
| 1999 | 61° | 44° | 52° | 0.23" | — |
| 1998 | 67° | 51° | 59° | 0.03" | — |
| 1997 | 80° | 50° | 65° | — | — |
| 1996 | 64° | 48° | 56° | 0.38" | — |
| 1995 | 65° | 42° | 53° | — | — |
| 1994 | 62° | 48° | 55° | 0.15" | — |
| 1993 | 87° | 51° | 69° | — | — |
| 1992 | 84° | 47° | 65° | — | — |
| 1991 | 52° | 47° | 49° | 1.4" | — |
| 1990 | 58° | 46° | 52° | 0.03" | — |
| 1989 | 62° | 42° | 52° | 0.89" | — |
| 1988 | 59° | 46° | 53° | 0.1" | — |
| 1987 | 63° | 37° | 50° | — | — |
| 1986 | 77° | 51° | 64° | — | — |
| 1985 | 79° | 46° | 62° | — | — |
| 1984 | 68° | 44° | 56° | — | — |
| 1983 | 66° | 48° | 57° | — | — |
| 1982 | 62° | 42° | 52° | 0.15" | — |
| 1981 | 61° | 50° | 55° | 0.79" | — |
| 1980 | 77° | 45° | 61° | — | — |
| 1979 | 71° | 41° | 56° | — | — |
| 1978 | 79° | 42° | 60° | — | — |
| 1977 | 60° | 45° | 52° | — | — |
| 1976 | 69° | 36° | 52° | — | — |
| 1975 | 65° | 51° | 58° | — | — |
| 1974 | 54° | 40° | 47° | 0.28" | — |
| 1973 | 75° | 50° | 63° | — | — |
| 1972 | 61° | 44° | 52° | 0.15" | — |
| 1971 | 63° | 42° | 52° | 0.05" | — |
55 years of data from HILLSBORO