Weather on March 31
Hillsboro, OR
55 Years of Data
Avg High
58°F
Avg Low
38°F
Warmest
2000
62°F avg
Coldest
2008
40°F avg
About This Date
March 31st in Hillsboro, OR typically brings cool spring weather, with average highs around 58°F and lows near 38°F. Over 56 years of records, the warmest March 31st was in 2000 (62°F average), while the coldest was 2008 (40°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 57% of March 31st dates historically, with the wettest March 31st recording 1.24" of rain. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for March 31st in Hillsboro, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 57° | 34° | 45° | — | — |
| 2025 | 51° | 37° | 44° | 0.38" | — |
| 2024 | 65° | 35° | 50° | — | — |
| 2023 | 51° | 41° | 46° | 0.66" | — |
| 2022 | 55° | 37° | 46° | — | — |
| 2021 | 71° | 28° | 50° | — | — |
| 2020 | 52° | 39° | 45° | 0.2" | — |
| 2019 | 69° | 35° | 52° | — | — |
| 2018 | 64° | 39° | 52° | — | — |
| 2017 | 59° | 34° | 46° | — | — |
| 2016 | 75° | 40° | 57° | — | — |
| 2015 | 53° | 41° | 47° | 1.09" | — |
| 2014 | 57° | 32° | 45° | 0.15" | — |
| 2013 | 73° | 41° | 57° | — | — |
| 2012 | 54° | 39° | 46° | 1.24" | — |
| 2011 | 61° | 44° | 52° | — | — |
| 2010 | 50° | 33° | 42° | — | — |
| 2009 | 51° | 38° | 44° | 0.08" | — |
| 2008coldest | 49° | 30° | 40° | — | — |
| 2007 | 56° | 36° | 46° | 0.48" | — |
| 2006 | 60° | 40° | 50° | 0.89" | — |
| 2005 | 61° | 39° | 50° | — | — |
| 2004 | 53° | 32° | 43° | 0.03" | — |
| 2003 | 72° | 46° | 59° | 0.08" | — |
| 2002 | 60° | 40° | 50° | — | — |
| 2001 | 59° | 41° | 50° | 0.1" | — |
| 2000warmest | 75° | 48° | 62° | — | — |
| 1999 | 55° | 33° | 44° | — | — |
| 1998 | 55° | 40° | 47° | 0.03" | — |
| 1997 | 50° | 35° | 43° | 0.58" | — |
| 1996 | 53° | 44° | 49° | 0.94" | — |
| 1995 | 61° | 37° | 49° | 0.03" | — |
| 1994 | 60° | 48° | 54° | 0.61" | — |
| 1993 | 59° | 41° | 50° | 0.25" | — |
| 1992 | 69° | 44° | 57° | — | — |
| 1991 | 69° | 35° | 52° | — | — |
| 1990 | 67° | 42° | 54° | — | — |
| 1989 | 49° | 38° | 43° | 0.25" | — |
| 1988 | 56° | 37° | 46° | — | — |
| 1987 | 72° | 34° | 53° | — | — |
| 1986 | 57° | 33° | 45° | 0.03" | — |
| 1985 | 56° | 44° | 50° | 0.2" | — |
| 1984 | 64° | 35° | 50° | 0.13" | — |
| 1983 | 60° | 41° | 51° | 0.64" | — |
| 1982 | 51° | 34° | 42° | 0.64" | — |
| 1981 | 54° | 43° | 48° | 0.3" | — |
| 1980 | 56° | 39° | 47° | 0.18" | — |
| 1979 | 53° | 40° | 46° | 0.08" | — |
| 1978 | 66° | 36° | 51° | — | — |
| 1977 | 56° | 42° | 49° | — | — |
| 1976 | 49° | 35° | 42° | 0.61" | — |
| 1975 | 52° | 34° | 43° | 0.1" | — |
| 1974 | 51° | 43° | 47° | 0.89" | — |
| 1973 | 49° | 36° | 42° | 0.51" | — |
| 1972 | 55° | 36° | 45° | 0.08" | — |
| 1971 | 51° | 35° | 43° | — | — |
56 years of data from HILLSBORO