Weather on August 18
Hillsboro, OR
55 Years of Data
Avg High
81°F
Avg Low
52°F
Warmest
2016
78°F avg
Coldest
1973
57°F avg
About This Date
August 18th in Hillsboro, OR typically brings warm summer weather, with average highs around 81°F and lows near 52°F — a 29°F daily swing. Over 55 years of records, the warmest August 18th was in 2016 (78°F average), while the coldest was 1973 (57°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 13% of August 18th dates historically, with the wettest August 18th recording 1.04" of rain. The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Hillsboro, OR? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 58° | 68° | — | — |
| 2024 | 76° | 56° | 66° | — | — |
| 2023 | 82° | 56° | 69° | — | — |
| 2022 | 89° | 64° | 77° | — | — |
| 2021 | 83° | 49° | 66° | — | — |
| 2020 | 85° | 59° | 72° | — | — |
| 2019 | 78° | 53° | 66° | — | — |
| 2018 | 89° | 47° | 68° | — | — |
| 2017 | 84° | 51° | 68° | — | — |
| 2016warmest | 102° | 54° | 78° | — | — |
| 2015 | 98° | 52° | 75° | — | — |
| 2014 | 92° | 55° | 73° | — | — |
| 2013 | 84° | 52° | 68° | — | — |
| 2012 | 80° | 58° | 69° | — | — |
| 2011 | 78° | 47° | 62° | — | — |
| 2010 | 77° | 50° | 64° | — | — |
| 2009 | 92° | 55° | 73° | — | — |
| 2008 | 69° | 60° | 65° | 0.61" | — |
| 2007 | 72° | 51° | 61° | 0.08" | — |
| 2006 | 96° | 51° | 74° | — | — |
| 2005 | 84° | 51° | 68° | — | — |
| 2004 | 89° | 55° | 72° | — | — |
| 2003 | 89° | 56° | 72° | — | — |
| 2002 | 82° | 53° | 68° | — | — |
| 2001 | 76° | 50° | 63° | — | — |
| 2000 | 70° | 46° | 58° | 0.18" | — |
| 1999 | 71° | 57° | 64° | — | — |
| 1998 | 73° | 53° | 63° | — | — |
| 1997 | 73° | 55° | 64° | — | — |
| 1996 | 72° | 47° | 59° | — | — |
| 1995 | 76° | 48° | 62° | — | — |
| 1994 | 81° | 50° | 65° | — | — |
| 1993 | 80° | 51° | 66° | — | — |
| 1992 | 93° | 57° | 75° | — | — |
| 1991 | 91° | 60° | 76° | — | — |
| 1990 | 69° | 56° | 62° | 0.41" | — |
| 1989 | 79° | 54° | 66° | — | — |
| 1988 | 71° | 45° | 58° | — | — |
| 1987 | 78° | 45° | 61° | — | — |
| 1986 | 89° | 49° | 69° | — | — |
| 1985 | 90° | 52° | 71° | — | — |
| 1984 | 82° | 49° | 65° | — | — |
| 1983 | 82° | 57° | 70° | — | — |
| 1982 | 83° | 50° | 66° | — | — |
| 1981 | 94° | 53° | 73° | — | — |
| 1980 | 76° | 53° | 64° | — | — |
| 1979 | 68° | 57° | 63° | 0.33" | — |
| 1978 | 76° | 53° | 64° | — | — |
| 1977 | 80° | 53° | 67° | — | — |
| 1976 | 78° | 46° | 62° | — | — |
| 1975 | 66° | 55° | 61° | 1.04" | — |
| 1974 | 67° | 56° | 61° | 0.38" | — |
| 1973coldest | 75° | 39° | 57° | — | — |
| 1972 | 80° | 46° | 63° | — | — |
| 1971 | 85° | 52° | 68° | — | — |
55 years of data from HILLSBORO