Weather on May 20
Hillsboro, OR
55 Years of Data
Avg High
68°F
Avg Low
46°F
Warmest
1978
68°F avg
Coldest
2022
47°F avg
About This Date
May 20th in Hillsboro, OR typically brings mild spring weather, with average highs around 68°F and lows near 46°F. Over 55 years of records, the warmest May 20th was in 1978 (68°F average), while the coldest was 2022 (47°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 20th dates historically, with the wettest May 20th recording 1.6" of rain. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Hillsboro, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 43° | 53° | — | — |
| 2024 | 69° | 37° | 53° | — | — |
| 2023 | 81° | 54° | 67° | — | — |
| 2022coldest | 59° | 35° | 47° | — | — |
| 2021 | 63° | 34° | 48° | 0.03" | — |
| 2020 | 62° | 50° | 56° | 0.05" | — |
| 2019 | 63° | 50° | 56° | 0.38" | — |
| 2018 | 71° | 51° | 61° | — | — |
| 2017 | 72° | 48° | 60° | — | — |
| 2016 | 66° | 42° | 54° | — | — |
| 2015 | 75° | 53° | 64° | — | — |
| 2014 | 73° | 44° | 59° | — | — |
| 2013 | 72° | 41° | 56° | — | — |
| 2012 | 62° | 52° | 57° | 0.53" | — |
| 2011 | 73° | 39° | 56° | — | — |
| 2010 | 57° | 44° | 51° | 0.89" | — |
| 2009 | 64° | 38° | 51° | — | — |
| 2008 | 63° | 50° | 56° | 0.61" | — |
| 2007 | 55° | 46° | 51° | 0.74" | — |
| 2006 | 74° | 52° | 63° | — | — |
| 2005 | 62° | 43° | 52° | 0.41" | — |
| 2004 | 69° | 51° | 60° | — | — |
| 2003 | 74° | 41° | 57° | — | — |
| 2002 | 59° | 49° | 54° | 0.53" | — |
| 2001 | 70° | 49° | 59° | — | — |
| 2000 | 78° | 56° | 67° | — | — |
| 1999 | 63° | 46° | 54° | — | — |
| 1998 | 58° | 52° | 55° | 1.6" | — |
| 1997 | 68° | 46° | 57° | — | — |
| 1996 | 65° | 44° | 54° | 0.38" | — |
| 1995 | 80° | 46° | 63° | — | — |
| 1994 | 64° | 51° | 58° | 1.57" | — |
| 1993 | 82° | 54° | 68° | 0.64" | — |
| 1992 | 71° | 41° | 56° | 0.3" | — |
| 1991 | 56° | 49° | 52° | 0.03" | — |
| 1990 | 66° | 48° | 57° | 0.28" | — |
| 1989 | 62° | 42° | 52° | — | — |
| 1988 | 68° | 42° | 55° | — | — |
| 1987 | 65° | 38° | 51° | — | — |
| 1986 | 74° | 51° | 62° | 0.94" | — |
| 1985 | 69° | 53° | 61° | — | — |
| 1984 | 60° | 42° | 51° | 0.23" | — |
| 1983 | 76° | 48° | 62° | — | — |
| 1982 | 71° | 37° | 54° | — | — |
| 1981 | 60° | 47° | 53° | — | — |
| 1980 | 71° | 47° | 59° | — | — |
| 1979 | 81° | 46° | 63° | — | — |
| 1978warmest | 86° | 50° | 68° | — | — |
| 1977 | 69° | 47° | 58° | — | — |
| 1976 | 65° | 44° | 54° | — | — |
| 1975 | 69° | 30° | 50° | — | — |
| 1974 | 62° | 43° | 52° | — | — |
| 1973 | 62° | 35° | 49° | — | — |
| 1972 | 76° | 57° | 66° | — | — |
| 1971 | 59° | 38° | 48° | 0.18" | — |
55 years of data from HILLSBORO