Weather on September 1
Hillsboro, OR
55 Years of Data
Avg High
79°F
Avg Low
50°F
Warmest
1987
77°F avg
Coldest
2000
52°F avg
About This Date
September 1st in Hillsboro, OR typically brings pleasant fall weather, with average highs around 79°F and lows near 50°F — a 29°F daily swing. Over 55 years of records, the warmest September 1st was in 1987 (77°F average), while the coldest was 2000 (52°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 22% of September 1st dates historically, with the wettest September 1st recording 1.93" of rain. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in Hillsboro, OR? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 54° | 67° | — | — |
| 2024 | 85° | 60° | 72° | — | — |
| 2023 | 81° | 60° | 70° | — | — |
| 2022 | 91° | 52° | 71° | — | — |
| 2021 | 79° | 42° | 60° | — | — |
| 2020 | 90° | 52° | 71° | — | — |
| 2019 | 83° | 57° | 70° | — | — |
| 2018 | 75° | 43° | 59° | — | — |
| 2017 | 96° | 52° | 74° | — | — |
| 2016 | 67° | 50° | 58° | 0.1" | — |
| 2015 | 75° | 55° | 65° | 0.1" | — |
| 2014 | 81° | 50° | 65° | — | — |
| 2013 | 83° | 56° | 69° | — | — |
| 2012 | 76° | 40° | 58° | — | — |
| 2011 | 78° | 41° | 60° | — | — |
| 2010 | 73° | 54° | 63° | 0.05" | — |
| 2009 | 77° | 55° | 66° | — | — |
| 2008 | 67° | 38° | 52° | — | — |
| 2007 | 82° | 44° | 63° | — | — |
| 2006 | 92° | 51° | 71° | — | — |
| 2005 | 86° | 49° | 67° | — | — |
| 2004 | 73° | 51° | 62° | 0.15" | — |
| 2003 | 86° | 46° | 66° | — | — |
| 2002 | 79° | 52° | 65° | — | — |
| 2001 | 77° | 56° | 66° | — | — |
| 2000coldest | 65° | 39° | 52° | 0.23" | — |
| 1999 | 75° | 38° | 56° | 0.03" | — |
| 1998 | 97° | 56° | 76° | — | — |
| 1997 | 80° | 54° | 67° | — | — |
| 1996 | 77° | 49° | 63° | — | — |
| 1995 | 91° | 55° | 73° | — | — |
| 1994 | 75° | 44° | 60° | — | — |
| 1993 | 88° | 48° | 68° | — | — |
| 1992 | 72° | 54° | 63° | — | — |
| 1991 | 67° | 41° | 54° | 0.99" | — |
| 1990 | 74° | 50° | 62° | — | — |
| 1989 | 73° | 56° | 64° | — | — |
| 1988 | 88° | 48° | 68° | — | — |
| 1987warmest | 101° | 53° | 77° | — | — |
| 1986 | 77° | 52° | 64° | — | — |
| 1985 | 76° | 46° | 61° | — | — |
| 1984 | 70° | 54° | 62° | 0.3" | — |
| 1983 | 76° | 56° | 66° | 0.53" | — |
| 1982 | 77° | 50° | 64° | — | — |
| 1981 | 79° | 47° | 63° | 0.05" | — |
| 1980 | 70° | 41° | 55° | — | — |
| 1979 | 80° | 59° | 70° | 0.18" | — |
| 1978 | 77° | 58° | 67° | — | — |
| 1977 | 80° | 44° | 62° | — | — |
| 1976 | 79° | 53° | 66° | — | — |
| 1975 | 64° | 46° | 55° | — | — |
| 1974 | 89° | 60° | 75° | — | — |
| 1973 | 78° | 37° | 58° | — | — |
| 1972 | 90° | 49° | 69° | — | — |
| 1971 | 66° | 53° | 60° | 1.93" | — |
55 years of data from HILLSBORO