Weather on August 31
Hillsboro, OR
55 Years of Data
About This Date
August 31st in Hillsboro, OR typically brings pleasant summer weather, with average highs around 77°F and lows near 51°F — a 26°F daily swing. Over 56 years of records, the warmest August 31st was in 1998 (78°F average), while the coldest was 2008 (52°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 23% of August 31st dates historically, with the wettest August 31st recording 0.75" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for August 31st in Hillsboro, OR? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 51° | 69° | — | — |
| 2025 | 83° | 53° | 68° | — | — |
| 2024 | 99° | 54° | 76° | — | — |
| 2023 | 64° | 59° | 62° | 0.75" | — |
| 2022 | 91° | 60° | 76° | — | — |
| 2021 | 67° | 45° | 56° | — | — |
| 2020 | 76° | 55° | 65° | — | — |
| 2019 | 83° | 52° | 67° | — | — |
| 2018 | 76° | 54° | 65° | — | — |
| 2017 | 83° | 57° | 70° | — | — |
| 2016 | 67° | 53° | 60° | 0.21" | — |
| 2015 | 73° | 57° | 65° | — | — |
| 2014 | 77° | 53° | 65° | — | — |
| 2013 | 87° | 51° | 69° | — | — |
| 2012 | 76° | 48° | 62° | — | — |
| 2011 | 68° | 48° | 58° | — | — |
| 2010 | 64° | 47° | 55° | 0.09" | — |
| 2009 | 81° | 54° | 67° | — | — |
| 2008coldest | 66° | 38° | 52° | 0.09" | — |
| 2007 | 76° | 53° | 64° | — | — |
| 2006 | 81° | 44° | 62° | — | — |
| 2005 | 81° | 50° | 65° | — | — |
| 2004 | 88° | 55° | 71° | — | — |
| 2003 | 85° | 49° | 67° | — | — |
| 2002 | 83° | 47° | 65° | — | — |
| 2001 | 80° | 55° | 68° | — | — |
| 2000 | 68° | 49° | 58° | — | — |
| 1999 | 65° | 43° | 54° | 0.01" | — |
| 1998warmest | 100° | 55° | 78° | — | — |
| 1997 | 82° | 54° | 68° | 0.12" | — |
| 1996 | 75° | 53° | 64° | — | — |
| 1995 | 89° | 53° | 71° | — | — |
| 1994 | 81° | 48° | 64° | — | — |
| 1993 | 85° | 49° | 67° | — | — |
| 1992 | 79° | 54° | 66° | — | — |
| 1991 | 67° | 49° | 58° | 0.39" | — |
| 1990 | 76° | 50° | 63° | — | — |
| 1989 | 68° | 54° | 61° | — | — |
| 1988 | 76° | 48° | 62° | — | — |
| 1987 | 98° | 53° | 76° | — | — |
| 1986 | 71° | 57° | 64° | — | — |
| 1985 | 71° | 44° | 58° | 0.01" | — |
| 1984 | 76° | 50° | 63° | 0.01" | — |
| 1983 | 73° | 56° | 64° | 0.07" | — |
| 1982 | 72° | 50° | 61° | — | — |
| 1981 | 75° | 44° | 60° | — | — |
| 1980 | 63° | 53° | 58° | 0.1" | — |
| 1979 | 79° | 58° | 68° | 0.08" | — |
| 1978 | 71° | 59° | 65° | — | — |
| 1977 | 74° | 49° | 61° | — | — |
| 1976 | 87° | 52° | 69° | — | — |
| 1975 | 68° | 47° | 57° | — | — |
| 1974 | 81° | 62° | 71° | — | — |
| 1973 | 69° | 42° | 56° | — | — |
| 1972 | 85° | 46° | 65° | — | — |
| 1971 | 67° | 54° | 60° | 0.17" | — |
Hillsboro, OR Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Hillsboro, OR Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Hillsboro, OR Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Hillsboro, OR
Most pleasant months in Hillsboro, OR: May, June, July, August, September.
What to expect on August 31st
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
August 31st outlook →