Weather on August 20
Hillsboro, OR
55 Years of Data
Avg High
80°F
Avg Low
53°F
Warmest
2016
80°F avg
Coldest
1985
57°F avg
About This Date
August 20th in Hillsboro, OR typically brings warm summer weather, with average highs around 80°F and lows near 53°F — a 27°F daily swing. Over 55 years of records, the warmest August 20th was in 2016 (80°F average), while the coldest was 1985 (57°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 13% of August 20th dates historically, with the wettest August 20th recording 2.87" of rain. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Hillsboro, OR? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 55° | 69° | — | — |
| 2024 | 77° | 54° | 65° | — | — |
| 2023 | 89° | 52° | 70° | — | — |
| 2022 | 80° | 60° | 70° | — | — |
| 2021 | 73° | 59° | 66° | — | — |
| 2020 | 83° | 58° | 70° | 0.43" | — |
| 2019 | 85° | 50° | 67° | — | — |
| 2018 | 84° | 56° | 70° | — | — |
| 2017 | 84° | 48° | 66° | — | — |
| 2016warmest | 101° | 59° | 80° | — | — |
| 2015 | 81° | 56° | 68° | — | — |
| 2014 | 79° | 55° | 67° | — | — |
| 2013 | 83° | 46° | 64° | — | — |
| 2012 | 79° | 50° | 64° | — | — |
| 2011 | 95° | 51° | 73° | — | — |
| 2010 | 76° | 40° | 58° | — | — |
| 2009 | 85° | 56° | 70° | — | — |
| 2008 | 70° | 57° | 63° | 0.33" | — |
| 2007 | 68° | 62° | 65° | 0.51" | — |
| 2006 | 94° | 51° | 72° | — | — |
| 2005 | 89° | 50° | 70° | — | — |
| 2004 | 89° | 54° | 71° | — | — |
| 2003 | 88° | 45° | 66° | — | — |
| 2002 | 79° | 49° | 64° | 0.08" | — |
| 2001 | 73° | 48° | 61° | — | — |
| 2000 | 74° | 40° | 57° | — | — |
| 1999 | 84° | 50° | 67° | — | — |
| 1998 | 86° | 58° | 72° | — | — |
| 1997 | 68° | 60° | 64° | 0.84" | — |
| 1996 | 71° | 48° | 60° | — | — |
| 1995 | 90° | 52° | 71° | — | — |
| 1994 | 77° | 54° | 65° | — | — |
| 1993 | 86° | 59° | 73° | 0.13" | — |
| 1992 | 88° | 46° | 67° | — | — |
| 1991 | 93° | 53° | 73° | — | — |
| 1990 | 78° | 55° | 67° | — | — |
| 1989 | 74° | 53° | 63° | — | — |
| 1988 | 79° | 44° | 61° | — | — |
| 1987 | 85° | 51° | 68° | — | — |
| 1986 | 82° | 51° | 67° | — | — |
| 1985coldest | 65° | 49° | 57° | — | — |
| 1984 | 76° | 46° | 61° | — | — |
| 1983 | 80° | 51° | 66° | — | — |
| 1982 | 84° | 52° | 68° | — | — |
| 1981 | 68° | 58° | 63° | — | — |
| 1980 | 82° | 42° | 62° | — | — |
| 1979 | 76° | 56° | 66° | — | — |
| 1978 | 65° | 60° | 62° | 2.87" | — |
| 1977 | 72° | 55° | 63° | — | — |
| 1976 | 72° | 58° | 65° | — | — |
| 1975 | 72° | 54° | 63° | — | — |
| 1974 | 70° | 61° | 65° | — | — |
| 1973 | 77° | 42° | 60° | — | — |
| 1972 | 78° | 55° | 67° | — | — |
| 1971 | 79° | 59° | 69° | — | — |
55 years of data from HILLSBORO