Weather on March 21
Pomona, CA
55 Years of Data
Avg High
69°F
Avg Low
47°F
Warmest
1993
74°F avg
Coldest
1973
45°F avg
About This Date
March 21st in Pomona, CA typically brings mild spring weather, with average highs around 69°F and lows near 47°F. Over 53 years of records, the warmest March 21st was in 1993 (74°F average), while the coldest was 1973 (45°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 9% of March 21st dates historically, with the wettest March 21st recording 3.56" of rain. The last decade has been 4.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.3°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Pomona, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 86° | 61° | 73° | — | — |
| 2025 | 76° | 48° | 62° | — | — |
| 2024 | 71° | 46° | 59° | — | — |
| 2023 | 52° | 43° | 47° | — | — |
| 2022 | 76° | 45° | 60° | — | — |
| 2021 | 64° | 42° | 53° | — | — |
| 2020 | 64° | 43° | 53° | — | — |
| 2019 | 56° | 45° | 50° | — | — |
| 2018 | 65° | 53° | 59° | — | — |
| 2017 | 63° | 50° | 56° | — | — |
| 2016 | 68° | 48° | 58° | — | — |
| 2015 | 78° | 50° | 64° | — | — |
| 2014 | 69° | 47° | 58° | — | — |
| 2013 | 73° | 46° | 60° | — | — |
| 2012 | 81° | 45° | 63° | — | — |
| 2011 | 57° | 44° | 51° | — | — |
| 2010 | 79° | 52° | 65° | — | — |
| 2009 | 54° | 53° | 53° | — | — |
| 2008 | 83° | 44° | 63° | — | — |
| 2007 | 63° | 50° | 56° | 0.18" | — |
| 2006 | 59° | 41° | 50° | — | — |
| 2005 | 71° | 49° | 60° | — | — |
| 2004 | 86° | 53° | 70° | — | — |
| 2003 | 81° | 50° | 65° | — | — |
| 2002 | 83° | 49° | 66° | — | — |
| 2001 | 73° | 50° | 62° | — | — |
| 2000 | 68° | 46° | 57° | — | — |
| 1999 | 64° | 37° | 51° | — | — |
| 1995 | 61° | 44° | 52° | — | — |
| 1994 | 75° | 46° | 61° | — | — |
| 1993warmest | 78° | 69° | 74° | — | — |
| 1992 | 57° | 46° | 52° | 3.56" | — |
| 1991 | 60° | 38° | 49° | — | — |
| 1990 | 85° | 47° | 66° | — | — |
| 1989 | 84° | 45° | 64° | — | — |
| 1988 | 80° | 55° | 68° | — | — |
| 1987 | 54° | 36° | 45° | 0.97" | — |
| 1986 | 88° | 48° | 68° | — | — |
| 1985 | 65° | 40° | 52° | — | — |
| 1984 | 75° | 55° | 65° | — | — |
| 1983 | 59° | 46° | 53° | — | — |
| 1982 | 72° | 37° | 54° | — | — |
| 1981 | 65° | 42° | 53° | — | — |
| 1980 | 64° | 46° | 55° | — | — |
| 1979 | 56° | 47° | 51° | — | — |
| 1978 | 68° | 55° | 62° | 0.13" | — |
| 1977 | 70° | 48° | 59° | — | — |
| 1976 | 79° | 46° | 62° | — | — |
| 1975 | 64° | 43° | 53° | — | — |
| 1974 | 59° | 49° | 54° | — | — |
| 1973coldest | 56° | 35° | 45° | 0.25" | — |
| 1972 | 68° | 49° | 58° | — | — |
| 1971 | 69° | 47° | 58° | — | — |
53 years of data from POMONA/FAIRPLEX