Weather on May 21
Pomona, CA
55 Years of Data
Avg High
76°F
Avg Low
53°F
Warmest
2000
80°F avg
Coldest
1975
51°F avg
About This Date
May 21st in Pomona, CA typically brings pleasant spring weather, with average highs around 76°F and lows near 53°F. Over 53 years of records, the warmest May 21st was in 2000 (80°F average), while the coldest was 1975 (51°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 21st dates historically. 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 May 21st in Pomona, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 58° | 74° | — | — |
| 2024 | 73° | 50° | 62° | — | — |
| 2023 | 81° | 57° | 69° | — | — |
| 2022 | 69° | 54° | 61° | — | — |
| 2021 | 70° | 50° | 60° | — | — |
| 2020 | 83° | 51° | 67° | — | — |
| 2019 | 60° | 50° | 55° | — | — |
| 2018 | 57° | 54° | 55° | — | — |
| 2017 | 91° | 62° | 77° | — | — |
| 2016 | 67° | 48° | 57° | — | — |
| 2015 | 66° | 52° | 59° | — | — |
| 2014 | 74° | 50° | 62° | — | — |
| 2013 | 87° | 54° | 70° | — | — |
| 2012 | 92° | 58° | 75° | — | — |
| 2011 | 80° | 52° | 66° | — | — |
| 2010 | 73° | 49° | 61° | — | — |
| 2009 | 94° | 56° | 75° | — | — |
| 2008 | 77° | 59° | 68° | — | — |
| 2007 | 61° | 56° | 58° | 0.08" | — |
| 2006 | 60° | 54° | 57° | — | — |
| 2005 | 96° | 59° | 78° | — | — |
| 2004 | 70° | 58° | 64° | — | — |
| 2003 | 98° | 58° | 78° | — | — |
| 2002 | 64° | 49° | 56° | — | — |
| 2001 | 79° | 57° | 68° | — | — |
| 2000warmest | 96° | 64° | 80° | — | — |
| 1999 | 65° | 51° | 58° | — | — |
| 1998 | 72° | 52° | 62° | — | — |
| 1995 | 80° | 50° | 65° | — | — |
| 1994 | 81° | 46° | 63° | — | — |
| 1993 | 76° | 57° | 66° | — | — |
| 1992 | 70° | 48° | 59° | — | — |
| 1991 | 62° | 55° | 59° | — | — |
| 1990 | 76° | 42° | 59° | — | — |
| 1989 | 85° | 52° | 68° | — | — |
| 1988 | 94° | 54° | 74° | — | — |
| 1987 | 70° | 45° | 57° | — | — |
| 1986 | 74° | 56° | 65° | — | — |
| 1985 | 80° | 54° | 67° | — | — |
| 1984 | 78° | 60° | 69° | — | — |
| 1983 | 83° | 52° | 67° | — | — |
| 1982 | 67° | 60° | 63° | — | — |
| 1981 | 74° | 44° | 59° | — | — |
| 1980 | 67° | 54° | 60° | 0.1" | — |
| 1979 | 69° | 55° | 62° | — | — |
| 1978 | 84° | 53° | 69° | — | — |
| 1977 | 82° | 47° | 64° | — | — |
| 1976 | 78° | 54° | 66° | — | — |
| 1975coldest | 59° | 42° | 51° | — | — |
| 1974 | 77° | 51° | 64° | — | — |
| 1973 | 65° | 55° | 60° | — | — |
| 1972 | 63° | 41° | 52° | — | — |
| 1971 | 79° | 52° | 65° | — | — |
53 years of data from POMONA/FAIRPLEX