Weather on May 31
Hillsboro, OR
55 Years of Data
Avg High
72°F
Avg Low
48°F
Warmest
1986
77°F avg
Coldest
1988
51°F avg
About This Date
May 31st in Hillsboro, OR typically brings pleasant spring weather, with average highs around 72°F and lows near 48°F. Over 55 years of records, the warmest May 31st was in 1986 (77°F average), while the coldest was 1988 (51°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 31st dates historically, with the wettest May 31st recording 1.93" 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 31st 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 | 70° | 49° | 59° | — | — |
| 2024 | 79° | 42° | 60° | — | — |
| 2023 | 64° | 39° | 52° | — | — |
| 2022 | 76° | 45° | 60° | — | — |
| 2021 | 88° | 51° | 69° | — | — |
| 2020 | 65° | 47° | 56° | — | — |
| 2019 | 83° | 52° | 67° | — | — |
| 2018 | 63° | 46° | 54° | 0.03" | — |
| 2017 | 74° | 54° | 64° | 0.13" | — |
| 2016 | 88° | 47° | 67° | — | — |
| 2015 | 85° | 54° | 69° | — | — |
| 2014 | 76° | 44° | 60° | — | — |
| 2013 | 68° | 46° | 57° | — | — |
| 2012 | 70° | 59° | 64° | 0.03" | — |
| 2011 | 60° | 49° | 54° | 0.3" | — |
| 2010 | 69° | 50° | 60° | 0.38" | — |
| 2009 | 85° | 49° | 67° | — | — |
| 2008 | 69° | 46° | 58° | — | — |
| 2007 | 85° | 47° | 66° | — | — |
| 2006 | 69° | 51° | 60° | 0.05" | — |
| 2005 | 65° | 53° | 59° | 0.1" | — |
| 2004 | 64° | 45° | 54° | — | — |
| 2003 | 64° | 53° | 59° | 0.1" | — |
| 2002 | 74° | 47° | 60° | — | — |
| 2001 | 87° | 50° | 69° | — | — |
| 2000 | 62° | 48° | 55° | — | — |
| 1999 | 69° | 48° | 59° | — | — |
| 1998 | 82° | 54° | 68° | — | — |
| 1997 | 69° | 55° | 62° | 0.58" | — |
| 1996 | 72° | 48° | 60° | — | — |
| 1995 | 78° | 50° | 64° | — | — |
| 1994 | 74° | 45° | 59° | — | — |
| 1993 | 72° | 56° | 64° | 0.84" | — |
| 1992 | 81° | 53° | 67° | — | — |
| 1991 | 62° | 42° | 52° | 0.03" | — |
| 1990 | 64° | 45° | 54° | 0.23" | — |
| 1989 | 70° | 48° | 59° | — | — |
| 1988coldest | 62° | 40° | 51° | — | — |
| 1987 | 64° | 49° | 56° | 0.84" | — |
| 1986warmest | 93° | 60° | 77° | — | — |
| 1985 | 66° | 52° | 59° | 0.05" | — |
| 1984 | 66° | 42° | 54° | — | — |
| 1983 | 64° | 55° | 60° | 0.51" | — |
| 1982 | 79° | 45° | 62° | — | — |
| 1981 | 70° | 41° | 55° | 0.03" | — |
| 1980 | 71° | 44° | 58° | — | — |
| 1979 | 85° | 47° | 66° | — | — |
| 1978 | 80° | 41° | 61° | — | — |
| 1977 | 62° | 54° | 58° | 1.93" | — |
| 1976 | 59° | 44° | 52° | 0.3" | — |
| 1975 | 88° | 48° | 68° | — | — |
| 1974 | 78° | 42° | 60° | — | — |
| 1973 | 64° | 53° | 59° | — | — |
| 1972 | 69° | 51° | 60° | — | — |
| 1971 | 55° | 48° | 52° | — | — |
55 years of data from HILLSBORO