Weather on March 21
Portland, OR
55 Years of Data
Avg High
57°F
Avg Low
42°F
Warmest
2004
63°F avg
Coldest
2012
36°F avg
About This Date
March 21st in Portland, OR typically brings cool spring weather, with average highs around 57°F and lows near 42°F. Over 56 years of records, the warmest March 21st was in 2004 (63°F average), while the coldest was 2012 (36°F) — a 27°F range across recorded history. Precipitation has occurred on 55% of recorded March 21st dates, with snow falling 2% of the time. The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Portland, OR? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 57° | 41° | 49° | — | — |
| 2025 | 48° | 45° | 46° | 2.49" | — |
| 2024 | 61° | 51° | 56° | — | — |
| 2023 | 61° | 40° | 50° | — | — |
| 2022 | 50° | 42° | 46° | 1.68" | — |
| 2021 | 48° | 42° | 45° | 0.46" | — |
| 2020 | 59° | 41° | 50° | — | — |
| 2019 | 60° | 48° | 54° | — | — |
| 2018 | 54° | 39° | 46° | 0.51" | — |
| 2017 | 58° | 45° | 51° | 0.71" | — |
| 2016 | 51° | 45° | 48° | 0.53" | — |
| 2015 | 59° | 49° | 54° | 0.81" | — |
| 2014 | 55° | 36° | 45° | — | — |
| 2013 | 49° | 37° | 43° | 0.2" | — |
| 2012coldest | 39° | 33° | 36° | 1.83" | 1" |
| 2011 | 53° | 44° | 49° | 0.2" | — |
| 2010 | 58° | 49° | 53° | 0.05" | — |
| 2009 | 52° | 39° | 45° | 0.03" | — |
| 2008 | 50° | 33° | 42° | — | — |
| 2007 | 55° | 34° | 44° | — | — |
| 2006 | 51° | 43° | 47° | 0.25" | — |
| 2005 | 55° | 39° | 47° | 0.05" | — |
| 2004warmest | 73° | 53° | 63° | — | — |
| 2003 | 53° | 45° | 49° | 1.3" | — |
| 2002 | 47° | 39° | 43° | — | — |
| 2001 | 61° | 40° | 50° | — | — |
| 2000 | 61° | 48° | 54° | 0.05" | — |
| 1999 | 60° | 47° | 53° | 0.2" | — |
| 1998 | 58° | 48° | 53° | 1.35" | — |
| 1997 | 62° | 37° | 50° | — | — |
| 1996 | 54° | 39° | 46° | 0.08" | — |
| 1995 | 46° | 37° | 42° | 0.81" | — |
| 1994 | 48° | 37° | 43° | 0.51" | — |
| 1993 | 66° | 45° | 55° | — | — |
| 1992 | 69° | 42° | 56° | — | — |
| 1991 | 51° | 41° | 46° | 0.43" | — |
| 1990 | 66° | 44° | 55° | — | — |
| 1989 | 53° | 42° | 48° | 0.13" | — |
| 1988 | 54° | 46° | 50° | 0.13" | — |
| 1987 | 61° | 43° | 52° | — | — |
| 1986 | 58° | 46° | 52° | 0.66" | — |
| 1985 | 50° | 35° | 43° | 1.12" | — |
| 1984 | 52° | 43° | 47° | 0.25" | — |
| 1983 | 57° | 47° | 52° | 0.2" | — |
| 1982 | 62° | 34° | 48° | — | — |
| 1981 | 59° | 40° | 49° | 0.23" | — |
| 1980 | 57° | 40° | 48° | — | — |
| 1979 | 67° | 39° | 53° | — | — |
| 1978 | 72° | 46° | 59° | — | — |
| 1977 | 62° | 40° | 51° | — | — |
| 1976 | 61° | 39° | 50° | — | — |
| 1975 | 45° | 37° | 41° | 0.71" | — |
| 1974 | 66° | 37° | 52° | — | — |
| 1973 | 57° | 40° | 48° | — | — |
| 1972 | 60° | 51° | 56° | 1.5" | — |
| 1971 | 62° | 39° | 51° | — | — |
56 years of data from PORTLAND KGW-TV