Weather on May 31
Pomona, CA
55 Years of Data
Avg High
79°F
Avg Low
54°F
Warmest
2004
78°F avg
Coldest
2023
55°F avg
About This Date
May 31st in Pomona, CA typically brings pleasant spring weather, with average highs around 79°F and lows near 54°F — a 25°F daily swing. Over 53 years of records, the warmest May 31st was in 2004 (78°F average), while the coldest was 2023 (55°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 31st dates historically. The last decade has been 4.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.7°F cooler on this date compared to 20-30 years ago.
Planning for May 31st in Pomona, CA? Great weather for outdoor activities.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 65° | 78° | — | — |
| 2024 | 77° | 51° | 64° | — | — |
| 2023coldest | 58° | 52° | 55° | — | — |
| 2022 | 79° | 51° | 65° | — | — |
| 2021 | 83° | 51° | 67° | — | — |
| 2020 | 82° | 53° | 68° | — | — |
| 2019 | 75° | 49° | 62° | — | — |
| 2018 | 71° | 50° | 61° | — | — |
| 2017 | 67° | 57° | 62° | — | — |
| 2016 | 76° | 53° | 64° | — | — |
| 2015 | 80° | 52° | 66° | — | — |
| 2014 | 87° | 53° | 70° | — | — |
| 2013 | 85° | 55° | 70° | — | — |
| 2012 | 90° | 56° | 73° | — | — |
| 2011 | 84° | 50° | 67° | — | — |
| 2010 | 80° | 50° | 65° | — | — |
| 2009 | 76° | 59° | 67° | — | — |
| 2008 | — | 52° | — | — | — |
| 2007 | 79° | 54° | 66° | — | — |
| 2006 | 96° | 57° | 77° | — | — |
| 2005 | 85° | 55° | 70° | — | — |
| 2004warmest | 95° | 60° | 78° | — | — |
| 2003 | 85° | 59° | 72° | — | — |
| 2002 | 81° | 57° | 69° | — | — |
| 2001 | 90° | 57° | 73° | — | — |
| 2000 | 80° | 52° | 66° | — | — |
| 1999 | 76° | 47° | 61° | — | — |
| 1998 | 78° | 51° | 65° | — | — |
| 1995 | 82° | 54° | 68° | — | — |
| 1994 | 87° | 57° | 72° | — | — |
| 1993 | 84° | 60° | 72° | — | — |
| 1992 | 81° | 53° | 67° | — | — |
| 1991 | 68° | 50° | 59° | 0.25" | — |
| 1990 | 72° | 54° | 63° | — | — |
| 1989 | 83° | 50° | 66° | — | — |
| 1988 | 80° | 56° | 68° | — | — |
| 1987 | 88° | 49° | 68° | — | — |
| 1986 | 79° | 53° | 66° | — | — |
| 1985 | 74° | 52° | 63° | — | — |
| 1984 | 80° | 60° | 70° | — | — |
| 1983 | 64° | 57° | 61° | — | — |
| 1982 | 72° | 48° | 60° | — | — |
| 1981 | 82° | 62° | 72° | — | — |
| 1980 | 62° | 53° | 58° | — | — |
| 1979 | 74° | 51° | 62° | — | — |
| 1978 | 87° | 56° | 71° | — | — |
| 1977 | 85° | 54° | 69° | — | — |
| 1976 | 72° | 49° | 60° | — | — |
| 1975 | 85° | 52° | 68° | — | — |
| 1974 | 69° | 54° | 61° | — | — |
| 1973 | 77° | 53° | 65° | — | — |
| 1972 | 93° | 59° | 76° | — | — |
| 1971 | 64° | 53° | 59° | — | — |
53 years of data from POMONA/FAIRPLEX