Weather on August 31
Pomona, CA
55 Years of Data
Avg High
91°F
Avg Low
61°F
Warmest
2017
94°F avg
Coldest
1992
65°F avg
About This Date
August 31st in Pomona, CA typically brings hot summer weather, with average highs around 91°F and lows near 61°F — a 30°F daily swing. Over 51 years of records, the warmest August 31st was in 2017 (94°F average), while the coldest was 1992 (65°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 31st dates historically. The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for August 31st in Pomona, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 98° | 67° | 82° | — | — |
| 2024 | 91° | 63° | 77° | — | — |
| 2023 | 89° | 67° | 78° | — | — |
| 2022 | 103° | 72° | 87° | — | — |
| 2021 | 77° | 62° | 70° | — | — |
| 2020 | 86° | 56° | 71° | — | — |
| 2019 | 94° | 65° | 79° | — | — |
| 2018 | 88° | 60° | 74° | — | — |
| 2017warmest | 107° | 80° | 94° | — | — |
| 2016 | 97° | 69° | 83° | — | — |
| 2015 | 87° | 60° | 74° | — | — |
| 2014 | 91° | 64° | 78° | — | — |
| 2013 | 92° | 73° | 82° | — | — |
| 2012 | 94° | 67° | 80° | — | — |
| 2011 | 89° | 59° | 74° | — | — |
| 2010 | 88° | 55° | 71° | — | — |
| 2009 | 104° | 50° | 77° | — | — |
| 2008 | 89° | 66° | 78° | — | — |
| 2007 | 105° | 74° | 89° | — | — |
| 2006 | 97° | 63° | 80° | — | — |
| 2005 | 91° | 61° | 76° | — | — |
| 2004 | 101° | 60° | 80° | — | — |
| 2003 | 94° | 63° | 78° | — | — |
| 2002 | 97° | 58° | 77° | — | — |
| 2001 | 87° | 56° | 71° | — | — |
| 2000 | 76° | 58° | 67° | — | — |
| 1999 | 89° | 53° | 71° | 0.03" | — |
| 1998 | 102° | 72° | 87° | — | — |
| 1993 | 87° | 59° | 73° | — | — |
| 1992coldest | 75° | 55° | 65° | — | — |
| 1991 | 93° | 56° | 74° | — | — |
| 1990 | 86° | 55° | 71° | — | — |
| 1989 | 87° | 50° | 69° | — | — |
| 1988 | 93° | 65° | 79° | — | — |
| 1987 | 90° | 54° | 72° | — | — |
| 1986 | 86° | 51° | 69° | — | — |
| 1985 | 97° | 61° | 79° | — | — |
| 1984 | 98° | 61° | 79° | — | — |
| 1983 | 95° | 56° | 75° | — | — |
| 1982 | 95° | 59° | 77° | — | — |
| 1981 | — | 62° | — | — | — |
| 1980 | 86° | 51° | 69° | — | — |
| 1979 | 84° | 57° | 71° | — | — |
| 1978 | 87° | 56° | 71° | — | — |
| 1977 | 84° | 64° | 74° | — | — |
| 1976 | 104° | 62° | 83° | — | — |
| 1975 | 89° | 52° | 70° | — | — |
| 1974 | 88° | 54° | 71° | — | — |
| 1973 | 80° | 57° | 69° | — | — |
| 1972 | 92° | 63° | 77° | — | — |
| 1971 | 87° | 54° | 70° | — | — |
51 years of data from POMONA/FAIRPLEX