Weather on August 15
Hillsboro, OR
55 Years of Data
Avg High
83°F
Avg Low
54°F
Warmest
2023
85°F avg
Coldest
2009
57°F avg
About This Date
August 15th in Hillsboro, OR typically brings warm summer weather, with average highs around 83°F and lows near 54°F — a 29°F daily swing. Over 55 years of records, the warmest August 15th was in 2023 (85°F average), while the coldest was 2009 (57°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 13% of August 15th dates historically, with the wettest August 15th recording 2.26" of rain. The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
Planning for August 15th in Hillsboro, OR? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 64° | 70° | 0.41" | — |
| 2024 | 78° | 59° | 69° | — | — |
| 2023warmest | 103° | 67° | 85° | — | — |
| 2022 | 90° | 52° | 71° | — | — |
| 2021 | 96° | 60° | 78° | — | — |
| 2020 | 100° | 55° | 78° | — | — |
| 2019 | 83° | 54° | 68° | — | — |
| 2018 | 91° | 57° | 74° | — | — |
| 2017 | 83° | 47° | 65° | — | — |
| 2016 | 88° | 53° | 70° | — | — |
| 2015 | 77° | 56° | 66° | — | — |
| 2014 | 79° | 62° | 70° | — | — |
| 2013 | 77° | 63° | 70° | 0.05" | — |
| 2012 | 95° | 53° | 74° | — | — |
| 2011 | 78° | 53° | 66° | — | — |
| 2010 | 98° | 54° | 76° | — | — |
| 2009coldest | 67° | 48° | 57° | — | — |
| 2008 | 103° | 61° | 82° | — | — |
| 2007 | 88° | 53° | 70° | — | — |
| 2006 | 76° | 49° | 62° | — | — |
| 2005 | 92° | 55° | 73° | — | — |
| 2004 | 87° | 59° | 73° | — | — |
| 2003 | 75° | 54° | 64° | 0.03" | — |
| 2002 | 90° | 52° | 71° | — | — |
| 2001 | 78° | 54° | 66° | — | — |
| 2000 | 75° | 43° | 59° | — | — |
| 1999 | 74° | 50° | 62° | — | — |
| 1998 | 75° | 59° | 67° | — | — |
| 1997 | 79° | 56° | 67° | — | — |
| 1996 | 85° | 53° | 69° | — | — |
| 1995 | 83° | 51° | 67° | — | — |
| 1994 | 79° | 52° | 65° | — | — |
| 1993 | 68° | 57° | 63° | 0.23" | — |
| 1992 | 93° | 54° | 73° | — | — |
| 1991 | 89° | 55° | 72° | — | — |
| 1990 | 83° | 52° | 67° | — | — |
| 1989 | 76° | 48° | 62° | — | — |
| 1988 | 70° | 53° | 61° | — | — |
| 1987 | 70° | 53° | 61° | — | — |
| 1986 | 92° | 55° | 73° | — | — |
| 1985 | 91° | 51° | 71° | — | — |
| 1984 | 80° | 48° | 64° | — | — |
| 1983 | 85° | 52° | 68° | — | — |
| 1982 | 73° | 44° | 59° | — | — |
| 1981 | 92° | 55° | 73° | — | — |
| 1980 | 73° | 44° | 59° | — | — |
| 1979 | 83° | 57° | 70° | 1.6" | — |
| 1978 | 72° | 60° | 66° | 0.94" | — |
| 1977 | 95° | 54° | 74° | — | — |
| 1976 | 63° | 53° | 58° | 2.26" | — |
| 1975 | 82° | 52° | 67° | — | — |
| 1974 | 82° | 47° | 64° | — | — |
| 1973 | 77° | 46° | 62° | — | — |
| 1972 | 74° | 53° | 63° | — | — |
| 1971 | 83° | 60° | 71° | — | — |
55 years of data from HILLSBORO