Weather on April 21
Pomona, CA
55 Years of Data
Avg High
75°F
Avg Low
48°F
Warmest
2009
79°F avg
Coldest
2010
47°F avg
About This Date
April 21st in Pomona, CA typically brings pleasant spring weather, with average highs around 75°F and lows near 48°F — a 27°F daily swing. Over 53 years of records, the warmest April 21st was in 2009 (79°F average), while the coldest was 2010 (47°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 6% of April 21st dates historically, with the wettest April 21st recording 3.18" of rain. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for April 21st in Pomona, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 48° | 62° | — | — |
| 2024 | 81° | 52° | 66° | — | — |
| 2023 | 87° | 55° | 71° | — | — |
| 2022 | 68° | 44° | 56° | — | — |
| 2021 | 59° | 50° | 55° | — | — |
| 2020 | 71° | 51° | 61° | — | — |
| 2019 | 68° | 47° | 57° | — | — |
| 2018 | 85° | 50° | 67° | — | — |
| 2017 | 90° | 54° | 72° | — | — |
| 2016 | 83° | 53° | 68° | — | — |
| 2015 | 59° | 51° | 55° | — | — |
| 2014 | 86° | 52° | 69° | — | — |
| 2013 | 85° | 51° | 68° | — | — |
| 2012 | 88° | 55° | 71° | — | — |
| 2011 | 71° | 51° | 61° | — | — |
| 2010coldest | 57° | 38° | 47° | — | — |
| 2009warmest | 100° | 58° | 79° | — | — |
| 2008 | 69° | 42° | 56° | — | — |
| 2007 | 64° | 47° | 55° | — | — |
| 2006 | 73° | 55° | 64° | — | — |
| 2005 | 84° | 46° | 65° | — | — |
| 2004 | 72° | 53° | 62° | — | — |
| 2003 | 66° | 50° | 58° | — | — |
| 2002 | 68° | 42° | 55° | — | — |
| 2001 | 61° | 44° | 52° | — | — |
| 2000 | 62° | 50° | 56° | — | — |
| 1999 | 62° | 47° | 54° | — | — |
| 1998 | 95° | 50° | 73° | — | — |
| 1995 | 86° | 49° | 67° | — | — |
| 1994 | 72° | 51° | 61° | — | — |
| 1993 | 75° | 47° | 61° | — | — |
| 1992 | 76° | 45° | 60° | — | — |
| 1991 | 67° | 51° | 59° | — | — |
| 1990 | 72° | 52° | 62° | — | — |
| 1989 | 79° | 56° | 67° | — | — |
| 1988 | 62° | 40° | 51° | 0.25" | — |
| 1987 | 93° | 50° | 72° | — | — |
| 1986 | 88° | 50° | 69° | — | — |
| 1985 | 60° | 40° | 50° | — | — |
| 1984 | 83° | 42° | 62° | — | — |
| 1983 | 65° | 50° | 57° | 3.18" | — |
| 1982 | 83° | 45° | 64° | — | — |
| 1981 | 78° | 45° | 61° | — | — |
| 1980 | 70° | 52° | 61° | — | — |
| 1979 | 80° | 45° | 62° | — | — |
| 1978 | 69° | 46° | 58° | — | — |
| 1977 | 80° | 44° | 62° | — | — |
| 1976 | 86° | 49° | 67° | — | — |
| 1975 | 76° | 44° | 60° | — | — |
| 1974 | 69° | 41° | 55° | — | — |
| 1973 | 70° | 41° | 55° | — | — |
| 1972 | 71° | 45° | 58° | — | — |
| 1971 | 57° | 44° | 51° | 0.05" | — |
53 years of data from POMONA/FAIRPLEX