Weather on September 4
Hillsboro, OR
55 Years of Data
Avg High
80°F
Avg Low
50°F
Warmest
2003
76°F avg
Coldest
2015
54°F avg
About This Date
September 4th in Hillsboro, OR typically brings warm fall weather, with average highs around 80°F and lows near 50°F — a 30°F daily swing. Over 55 years of records, the warmest September 4th was in 2003 (76°F average), while the coldest was 2015 (54°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 16% of September 4th dates historically. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
Planning for September 4th in Hillsboro, OR? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 60° | 75° | — | — |
| 2024 | 94° | 48° | 71° | — | — |
| 2023 | 67° | 51° | 59° | — | — |
| 2022 | 85° | 50° | 67° | — | — |
| 2021 | 87° | 47° | 67° | — | — |
| 2020 | 88° | 54° | 71° | — | — |
| 2019 | 82° | 52° | 67° | — | — |
| 2018 | 84° | 43° | 63° | — | — |
| 2017 | 93° | 58° | 75° | — | — |
| 2016 | 69° | 42° | 56° | — | — |
| 2015coldest | 68° | 39° | 54° | — | — |
| 2014 | 83° | 45° | 64° | — | — |
| 2013 | 75° | 59° | 67° | 0.03" | — |
| 2012 | 86° | 48° | 67° | — | — |
| 2011 | 90° | 46° | 68° | — | — |
| 2010 | 69° | 53° | 61° | — | — |
| 2009 | 76° | 54° | 65° | — | — |
| 2008 | 79° | 46° | 62° | — | — |
| 2007 | 74° | 54° | 64° | 0.41" | — |
| 2006 | 89° | 52° | 70° | — | — |
| 2005 | 72° | 48° | 60° | — | — |
| 2004 | 71° | 51° | 61° | — | — |
| 2003warmest | 95° | 58° | 76° | — | — |
| 2002 | 73° | 45° | 59° | — | — |
| 2001 | 69° | 49° | 59° | — | — |
| 2000 | 71° | 42° | 57° | 0.03" | — |
| 1999 | 80° | 47° | 63° | — | — |
| 1998 | 89° | 55° | 72° | — | — |
| 1997 | 81° | 56° | 68° | — | — |
| 1996 | 66° | 49° | 57° | 0.38" | — |
| 1995 | 75° | 57° | 66° | 0.08" | — |
| 1994 | 76° | 47° | 61° | — | — |
| 1993 | 87° | 52° | 69° | — | — |
| 1992 | 79° | 48° | 63° | — | — |
| 1991 | 88° | 49° | 68° | — | — |
| 1990 | 84° | 51° | 68° | — | — |
| 1989 | 77° | 45° | 61° | — | — |
| 1988 | 91° | 54° | 72° | — | — |
| 1987 | 79° | 50° | 64° | — | — |
| 1986 | 90° | 54° | 72° | — | — |
| 1985 | 77° | 44° | 61° | — | — |
| 1984 | 85° | 45° | 65° | — | — |
| 1983 | 73° | 52° | 62° | — | — |
| 1982 | 67° | 57° | 62° | 0.15" | — |
| 1981 | 82° | 48° | 65° | — | — |
| 1980 | 77° | 42° | 60° | — | — |
| 1979 | 71° | 54° | 62° | 0.08" | — |
| 1978 | 62° | 54° | 58° | 0.25" | — |
| 1977 | 76° | 58° | 67° | 0.3" | — |
| 1976 | 79° | 50° | 64° | — | — |
| 1975 | 86° | 44° | 65° | — | — |
| 1974 | 74° | 59° | 66° | — | — |
| 1973 | 97° | 50° | 73° | — | — |
| 1972 | 83° | 51° | 67° | — | — |
| 1971 | 79° | 44° | 61° | — | — |
55 years of data from HILLSBORO