Weather on July 31
San Marcos, CA
55 Years of Data
Avg High
88°F
Avg Low
64°F
Warmest
1980
86°F avg
Coldest
2010
66°F avg
About This Date
July 31st in San Marcos, CA typically brings warm summer weather, with average highs around 88°F and lows near 64°F. Over 55 years of records, the warmest July 31st was in 1980 (86°F average), while the coldest was 2010 (66°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 5% of July 31st dates historically, with the wettest July 31st recording 0.97" of rain. The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for July 31st in San Marcos, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 62° | 76° | — | — |
| 2024 | 91° | 60° | 76° | — | — |
| 2023 | 87° | 72° | 79° | — | — |
| 2022 | 92° | 69° | 80° | — | — |
| 2021 | 90° | 65° | 77° | — | — |
| 2020 | 98° | 67° | 82° | — | — |
| 2019 | 87° | 63° | 75° | — | — |
| 2018 | 96° | 72° | 84° | — | — |
| 2017 | 88° | 67° | 77° | — | — |
| 2016 | 91° | 69° | 80° | — | — |
| 2015 | 91° | 68° | 80° | — | — |
| 2014 | 94° | 68° | 81° | — | — |
| 2013 | 80° | 61° | 70° | — | — |
| 2012 | 87° | 65° | 76° | — | — |
| 2011 | 85° | 65° | 75° | 0.23" | — |
| 2010coldest | 70° | 62° | 66° | — | — |
| 2009 | 76° | 68° | 72° | — | — |
| 2008 | 73° | 64° | 69° | — | — |
| 2007 | 90° | 63° | 76° | — | — |
| 2006 | 77° | 61° | 69° | 0.69" | — |
| 2005 | 90° | 67° | 78° | — | — |
| 2004 | 84° | 60° | 72° | — | — |
| 2003 | 76° | 67° | 71° | — | — |
| 2002 | 84° | 60° | 72° | — | — |
| 2001 | 82° | 61° | 71° | — | — |
| 2000 | 98° | 63° | 80° | — | — |
| 1999 | 86° | 59° | 73° | — | — |
| 1998 | 85° | 59° | 72° | — | — |
| 1997 | 91° | 58° | 74° | — | — |
| 1996 | 104° | 67° | 85° | — | — |
| 1995 | 90° | 63° | 76° | — | — |
| 1994 | 83° | 63° | 73° | — | — |
| 1993 | 95° | 61° | 78° | — | — |
| 1992 | 91° | 64° | 78° | — | — |
| 1991 | 74° | 63° | 68° | 0.97" | — |
| 1990 | 93° | 63° | 78° | — | — |
| 1989 | 89° | 62° | 76° | — | — |
| 1988 | 83° | 64° | 73° | — | — |
| 1987 | 92° | 59° | 75° | — | — |
| 1986 | 88° | 57° | 72° | — | — |
| 1985 | 85° | 63° | 74° | — | — |
| 1984 | 88° | 70° | 79° | — | — |
| 1983 | 89° | 62° | 76° | — | — |
| 1982 | 90° | 64° | 77° | — | — |
| 1981 | 85° | 62° | 73° | — | — |
| 1980warmest | 97° | 75° | 86° | — | — |
| 1979 | 97° | 61° | 79° | — | — |
| 1978 | 85° | 58° | 71° | — | — |
| 1977 | 91° | 64° | 78° | — | — |
| 1976 | 84° | 61° | 72° | — | — |
| 1975 | 85° | 61° | 73° | — | — |
| 1974 | 85° | 64° | 74° | — | — |
| 1973 | 88° | 59° | 73° | — | — |
| 1972 | 100° | 68° | 84° | — | — |
| 1971 | 90° | 59° | 74° | — | — |
55 years of data from ESCONDIDO #2