Weather on July 18
San Mateo, CA
55 Years of Data
Avg High
73°F
Avg Low
56°F
Warmest
1984
72°F avg
Coldest
1980
58°F avg
About This Date
July 18th in San Mateo, CA typically brings pleasant summer weather, with average highs around 73°F and lows near 56°F. Over 55 years of records, the warmest July 18th was in 1984 (72°F average), while the coldest was 1980 (58°F) — a 14°F range across recorded history. Rain or other precipitation has occurred on about 2% of July 18th dates historically. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for July 18th in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 57° | 62° | — | — |
| 2024 | 70° | 55° | 62° | — | — |
| 2023 | 70° | 57° | 63° | — | — |
| 2022 | 71° | 57° | 64° | — | — |
| 2021 | 74° | 55° | 64° | — | — |
| 2020 | 75° | 58° | 66° | — | — |
| 2019 | 78° | 58° | 68° | — | — |
| 2018 | 71° | 55° | 63° | — | — |
| 2017 | 67° | 55° | 61° | — | — |
| 2016 | 69° | 56° | 62° | — | — |
| 2015 | 76° | 59° | 67° | — | — |
| 2014 | 74° | 62° | 68° | — | — |
| 2013 | 69° | 54° | 61° | — | — |
| 2012 | 68° | 57° | 63° | — | — |
| 2011 | 75° | 56° | 65° | — | — |
| 2010 | 68° | 56° | 62° | — | — |
| 2009 | 73° | 54° | 63° | — | — |
| 2008 | 64° | 53° | 59° | — | — |
| 2007 | 73° | 61° | 67° | 0.03" | — |
| 2006 | 83° | 58° | 70° | — | — |
| 2005 | 72° | 57° | 64° | — | — |
| 2004 | 77° | 63° | 70° | — | — |
| 2003 | 74° | 54° | 64° | — | — |
| 2002 | 69° | 55° | 62° | — | — |
| 2001 | 72° | 54° | 63° | — | — |
| 2000 | 69° | 56° | 62° | — | — |
| 1999 | 71° | 50° | 61° | — | — |
| 1998 | 87° | 56° | 71° | — | — |
| 1997 | 72° | 56° | 64° | — | — |
| 1996 | 72° | 53° | 62° | — | — |
| 1995 | 73° | 54° | 63° | — | — |
| 1994 | 72° | 54° | 63° | — | — |
| 1993 | 72° | 54° | 63° | — | — |
| 1992 | 74° | 62° | 68° | — | — |
| 1991 | 72° | 56° | 64° | — | — |
| 1990 | 72° | 59° | 65° | — | — |
| 1989 | 73° | 57° | 65° | — | — |
| 1988 | 83° | 56° | 69° | — | — |
| 1987 | 68° | 54° | 61° | — | — |
| 1986 | 66° | 53° | 60° | — | — |
| 1985 | 71° | 53° | 62° | — | — |
| 1984warmest | 84° | 59° | 72° | — | — |
| 1983 | 71° | 56° | 63° | — | — |
| 1982 | 68° | 55° | 62° | — | — |
| 1981 | 68° | 51° | 60° | — | — |
| 1980coldest | 63° | 54° | 58° | — | — |
| 1979 | 69° | 53° | 61° | — | — |
| 1978 | 88° | 54° | 71° | — | — |
| 1977 | 75° | 53° | 64° | — | — |
| 1976 | 75° | 52° | 63° | — | — |
| 1975 | 75° | 53° | 64° | — | — |
| 1974 | 75° | 58° | 66° | — | — |
| 1973 | 72° | 55° | 63° | — | — |
| 1972 | 75° | 52° | 63° | — | — |
| 1971 | 79° | 52° | 65° | — | — |
55 years of data from BURLINGAME