Weather on August 31
Hillsboro, OR
55 Years of Data
Avg High
77°F
Avg Low
51°F
Warmest
1998
78°F avg
Coldest
2008
52°F avg
About This Date
August 31st in Hillsboro, OR typically brings pleasant summer weather, with average highs around 77°F and lows near 51°F — a 26°F daily swing. Over 55 years of records, the warmest August 31st was in 1998 (78°F average), while the coldest was 2008 (52°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 24% of August 31st dates historically, with the wettest August 31st recording 1.9" 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 August 31st in Hillsboro, OR? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 83° | 53° | 68° | — | — |
| 2024 | 99° | 54° | 76° | — | — |
| 2023 | 64° | 59° | 62° | 1.9" | — |
| 2022 | 91° | 60° | 76° | — | — |
| 2021 | 67° | 45° | 56° | — | — |
| 2020 | 76° | 55° | 65° | — | — |
| 2019 | 83° | 52° | 67° | — | — |
| 2018 | 76° | 54° | 65° | — | — |
| 2017 | 83° | 57° | 70° | — | — |
| 2016 | 67° | 53° | 60° | 0.53" | — |
| 2015 | 73° | 57° | 65° | — | — |
| 2014 | 77° | 53° | 65° | — | — |
| 2013 | 87° | 51° | 69° | — | — |
| 2012 | 76° | 48° | 62° | — | — |
| 2011 | 68° | 48° | 58° | — | — |
| 2010 | 64° | 47° | 55° | 0.23" | — |
| 2009 | 81° | 54° | 67° | — | — |
| 2008coldest | 66° | 38° | 52° | 0.23" | — |
| 2007 | 76° | 53° | 64° | — | — |
| 2006 | 81° | 44° | 62° | — | — |
| 2005 | 81° | 50° | 65° | — | — |
| 2004 | 88° | 55° | 71° | — | — |
| 2003 | 85° | 49° | 67° | — | — |
| 2002 | 83° | 47° | 65° | — | — |
| 2001 | 80° | 55° | 68° | — | — |
| 2000 | 68° | 49° | 58° | — | — |
| 1999 | 65° | 43° | 54° | 0.03" | — |
| 1998warmest | 100° | 55° | 78° | — | — |
| 1997 | 82° | 54° | 68° | 0.3" | — |
| 1996 | 75° | 53° | 64° | — | — |
| 1995 | 89° | 53° | 71° | — | — |
| 1994 | 81° | 48° | 64° | — | — |
| 1993 | 85° | 49° | 67° | — | — |
| 1992 | 79° | 54° | 66° | — | — |
| 1991 | 67° | 49° | 58° | 0.99" | — |
| 1990 | 76° | 50° | 63° | — | — |
| 1989 | 68° | 54° | 61° | — | — |
| 1988 | 76° | 48° | 62° | — | — |
| 1987 | 98° | 53° | 76° | — | — |
| 1986 | 71° | 57° | 64° | — | — |
| 1985 | 71° | 44° | 58° | 0.03" | — |
| 1984 | 76° | 50° | 63° | 0.03" | — |
| 1983 | 73° | 56° | 64° | 0.18" | — |
| 1982 | 72° | 50° | 61° | — | — |
| 1981 | 75° | 44° | 60° | — | — |
| 1980 | 63° | 53° | 58° | 0.25" | — |
| 1979 | 79° | 58° | 68° | 0.2" | — |
| 1978 | 71° | 59° | 65° | — | — |
| 1977 | 74° | 49° | 61° | — | — |
| 1976 | 87° | 52° | 69° | — | — |
| 1975 | 68° | 47° | 57° | — | — |
| 1974 | 81° | 62° | 71° | — | — |
| 1973 | 69° | 42° | 56° | — | — |
| 1972 | 85° | 46° | 65° | — | — |
| 1971 | 67° | 54° | 60° | 0.43" | — |
55 years of data from HILLSBORO