Weather on May 15
Hillsboro, OR
55 Years of Data
Avg High
68°F
Avg Low
45°F
Warmest
2006
72°F avg
Coldest
2001
24°F avg
About This Date
May 15th in Hillsboro, OR typically brings mild spring weather, with average highs around 68°F and lows near 45°F. Over 55 years of records, the warmest May 15th was in 2006 (72°F average), while the coldest was 2001 (24°F) — a 48°F range across recorded history. Rain or other precipitation has occurred on about 44% of May 15th dates historically, with the wettest May 15th recording 1.45" of rain. The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for May 15th in Hillsboro, OR? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 57° | 49° | 53° | 0.13" | — |
| 2024 | 82° | 51° | 67° | — | — |
| 2023 | 88° | 55° | 71° | — | — |
| 2022 | 67° | 54° | 60° | 1.45" | — |
| 2021 | 81° | 43° | 62° | — | — |
| 2020 | 67° | 50° | 58° | — | — |
| 2019 | 65° | 43° | 54° | 0.28" | — |
| 2018 | 71° | 54° | 62° | — | — |
| 2017 | 59° | 43° | 51° | 0.28" | — |
| 2016 | 60° | 53° | 57° | 0.94" | — |
| 2015 | 62° | 46° | 54° | 0.03" | — |
| 2014 | 81° | 52° | 66° | — | — |
| 2013 | 58° | 46° | 52° | 0.1" | — |
| 2012 | 79° | 46° | 62° | — | — |
| 2011 | 57° | 43° | 50° | 1.27" | — |
| 2010 | 74° | 44° | 59° | — | — |
| 2009 | 70° | 37° | 53° | — | — |
| 2008 | 86° | 49° | 67° | — | — |
| 2007 | 84° | 45° | 64° | — | — |
| 2006warmest | 94° | 50° | 72° | — | — |
| 2005 | 64° | 53° | 59° | 0.58" | — |
| 2004 | 59° | 50° | 55° | 0.03" | — |
| 2003 | 68° | 44° | 56° | — | — |
| 2002 | 63° | 40° | 51° | 0.03" | — |
| 2001coldest | 58° | -10° | 24° | 0.66" | — |
| 2000 | 72° | 55° | 63° | — | — |
| 1999 | 62° | 46° | 54° | — | — |
| 1998 | 59° | 47° | 53° | 0.28" | — |
| 1997 | 78° | 53° | 66° | — | — |
| 1996 | 62° | 49° | 55° | 0.28" | — |
| 1995 | 82° | 53° | 68° | — | — |
| 1994 | 68° | 50° | 59° | 0.05" | — |
| 1993 | 70° | 53° | 61° | — | — |
| 1992 | 79° | 45° | 62° | — | — |
| 1991 | 62° | 37° | 50° | — | — |
| 1990 | 59° | 40° | 49° | 0.51" | — |
| 1989 | 77° | 44° | 61° | — | — |
| 1988 | 66° | 47° | 56° | — | — |
| 1987 | 69° | 53° | 61° | — | — |
| 1986 | 63° | 37° | 50° | — | — |
| 1985 | 63° | 37° | 50° | — | — |
| 1984 | 58° | 39° | 48° | 0.53" | — |
| 1983 | 58° | 42° | 50° | 0.33" | — |
| 1982 | 72° | 42° | 57° | — | — |
| 1981 | 64° | 44° | 54° | 0.51" | — |
| 1980 | 62° | 46° | 54° | — | — |
| 1979 | 76° | 48° | 62° | — | — |
| 1978 | 61° | 43° | 52° | 0.38" | — |
| 1977 | 56° | 43° | 49° | 0.61" | — |
| 1976 | 78° | 39° | 59° | — | — |
| 1975 | 65° | 48° | 56° | — | — |
| 1974 | 53° | 37° | 45° | 0.25" | — |
| 1973 | 82° | 49° | 65° | — | — |
| 1972 | 65° | 49° | 57° | 0.08" | — |
| 1971 | 61° | 42° | 51° | 0.18" | — |
55 years of data from HILLSBORO