Weather on October 31
Hillsboro, OR
55 Years of Data
Avg High
56°F
Avg Low
39°F
Warmest
1987
59°F avg
Coldest
2003
35°F avg
About This Date
October 31st in Hillsboro, OR typically brings cool fall weather, with average highs around 56°F and lows near 39°F. Over 55 years of records, the warmest October 31st was in 1987 (59°F average), while the coldest was 2003 (35°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 58% of October 31st dates historically, with the wettest October 31st recording 4.98" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for October 31st in Hillsboro, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 56° | 36° | 46° | 0.69" | — |
| 2024 | 50° | 43° | 46° | 0.71" | — |
| 2023 | 61° | 30° | 46° | — | — |
| 2022 | 56° | 47° | 51° | 2.11" | — |
| 2021 | 61° | 48° | 54° | — | — |
| 2020 | 62° | 30° | 46° | — | — |
| 2019 | 55° | 24° | 40° | — | — |
| 2018 | 56° | 48° | 52° | 0.2" | — |
| 2017 | 63° | 30° | 47° | — | — |
| 2016 | 55° | 49° | 52° | 0.61" | — |
| 2015 | 63° | 49° | 56° | 3.35" | — |
| 2014 | 58° | 45° | 51° | 2.16" | — |
| 2013 | 60° | 42° | 51° | — | — |
| 2012 | 58° | 52° | 55° | 0.91" | — |
| 2011 | 56° | 32° | 44° | 0.08" | — |
| 2010 | 55° | 39° | 47° | 0.03" | — |
| 2009 | 59° | 40° | 49° | 0.25" | — |
| 2008 | 60° | 50° | 55° | 0.94" | — |
| 2007 | 56° | 27° | 42° | — | — |
| 2006 | 53° | 20° | 37° | — | — |
| 2005 | 57° | 51° | 54° | 2.77" | — |
| 2004 | 54° | 34° | 44° | 0.1" | — |
| 2003coldest | 45° | 26° | 35° | — | — |
| 2002 | 48° | 25° | 36° | — | — |
| 2001 | 54° | 46° | 50° | 2.11" | — |
| 2000 | 54° | 34° | 44° | — | — |
| 1999 | 56° | 40° | 48° | — | — |
| 1998 | 52° | 41° | 46° | 0.51" | — |
| 1997 | 67° | 47° | 57° | 0.18" | — |
| 1996 | 60° | 32° | 46° | — | — |
| 1995 | 54° | 28° | 41° | — | — |
| 1994 | 54° | 40° | 47° | 4.98" | — |
| 1993 | 66° | 38° | 52° | 0.38" | — |
| 1992 | 54° | 46° | 50° | 1.09" | — |
| 1991 | 50° | 29° | 39° | — | — |
| 1990 | 53° | 47° | 50° | 1.32" | — |
| 1989 | 55° | 30° | 43° | — | — |
| 1988 | 67° | 43° | 55° | — | — |
| 1987warmest | 65° | 53° | 59° | 0.76" | — |
| 1986 | 56° | 50° | 53° | 0.43" | — |
| 1985 | 55° | 34° | 44° | 0.13" | — |
| 1984 | 50° | 36° | 43° | 0.05" | — |
| 1983 | 60° | 46° | 53° | 0.46" | — |
| 1982 | 56° | 43° | 49° | — | — |
| 1981 | 56° | 43° | 49° | 0.05" | — |
| 1980 | 55° | 39° | 47° | 0.18" | — |
| 1979 | 49° | 37° | 43° | 1.19" | — |
| 1978 | 62° | 29° | 45° | — | — |
| 1977 | 55° | 43° | 49° | — | — |
| 1976 | 60° | 46° | 53° | 0.97" | — |
| 1975 | 58° | 36° | 47° | — | — |
| 1974 | 59° | 41° | 50° | 0.33" | — |
| 1973 | 60° | 43° | 51° | 0.74" | — |
| 1972 | 48° | 31° | 39° | — | — |
| 1971 | 49° | 40° | 44° | — | — |
55 years of data from HILLSBORO