Weather on March 21
Hillsboro, OR
55 Years of Data
Avg High
57°F
Avg Low
38°F
Warmest
1986
56°F avg
Coldest
2012
36°F avg
About This Date
March 21st in Hillsboro, OR typically brings cool spring weather, with average highs around 57°F and lows near 38°F. Over 56 years of records, the warmest March 21st was in 1986 (56°F average), while the coldest was 2012 (36°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 54% of March 21st dates historically, with the wettest March 21st recording 2.72" of rain. The last decade has been 2.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.1°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Hillsboro, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Cooling Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 57° | 38° | 47° | — | — |
| 2025 | 48° | 41° | 45° | 1.98" | — |
| 2024 | 61° | 45° | 53° | 0.2" | — |
| 2023 | 63° | 37° | 50° | — | — |
| 2022 | 51° | 42° | 47° | 1.24" | — |
| 2021 | 49° | 39° | 44° | 0.2" | — |
| 2020 | 61° | 31° | 46° | — | — |
| 2019 | 57° | 42° | 50° | 0.2" | — |
| 2018 | 53° | 32° | 43° | 0.58" | — |
| 2017 | 59° | 44° | 52° | 0.56" | — |
| 2016 | 51° | 44° | 48° | 0.53" | — |
| 2015 | 60° | 42° | 51° | 0.58" | — |
| 2014 | 56° | 30° | 43° | — | — |
| 2013 | 50° | 34° | 42° | 0.23" | — |
| 2012coldest | 39° | 32° | 36° | 1.4" | — |
| 2011 | 51° | 36° | 43° | 0.1" | — |
| 2010 | 57° | 45° | 51° | 0.23" | — |
| 2009 | 53° | 34° | 43° | — | — |
| 2008 | 48° | 31° | 40° | 0.03" | — |
| 2007 | 54° | 28° | 41° | — | — |
| 2006 | 51° | 42° | 47° | 0.41" | — |
| 2005 | 51° | 29° | 40° | 0.1" | — |
| 2004 | 70° | 39° | 54° | — | — |
| 2003 | 58° | 46° | 52° | 0.69" | — |
| 2002 | 57° | 37° | 47° | — | — |
| 2001 | 62° | 29° | 45° | — | — |
| 2000 | 64° | 47° | 55° | — | — |
| 1999 | 61° | 47° | 54° | 0.03" | — |
| 1998 | 59° | 52° | 55° | 2.72" | — |
| 1997 | 61° | 37° | 49° | — | — |
| 1996 | 55° | 39° | 47° | 0.41" | — |
| 1995 | 48° | 36° | 42° | 0.43" | — |
| 1994 | 52° | 35° | 43° | 1.02" | — |
| 1993 | 61° | 41° | 51° | — | — |
| 1992 | 70° | 40° | 55° | — | — |
| 1991 | 58° | 38° | 48° | 0.13" | — |
| 1990 | 65° | 39° | 52° | — | — |
| 1989 | 58° | 33° | 45° | 0.71" | — |
| 1988 | 58° | 44° | 51° | — | — |
| 1987 | 56° | 36° | 46° | — | — |
| 1986warmest | 70° | 43° | 56° | 0.25" | — |
| 1985 | 56° | 34° | 45° | 0.94" | — |
| 1984 | 59° | 43° | 51° | 0.71" | — |
| 1983 | 62° | 36° | 49° | — | — |
| 1982 | 52° | 30° | 41° | — | — |
| 1981 | 56° | 32° | 44° | — | — |
| 1980 | 53° | 36° | 44° | 0.15" | — |
| 1979 | 66° | 32° | 49° | — | — |
| 1978 | 72° | 38° | 55° | — | — |
| 1977 | 60° | 35° | 48° | — | — |
| 1976 | 59° | 35° | 47° | — | — |
| 1975 | 45° | 40° | 42° | 0.81" | — |
| 1974 | 67° | 33° | 50° | — | — |
| 1973 | 56° | 39° | 47° | — | — |
| 1972 | 59° | 48° | 54° | 1.22" | — |
| 1971 | 57° | 34° | 45° | — | — |
56 years of data from HILLSBORO