Weather on October 18
San Mateo, CA
55 Years of Data
Avg High
71°F
Avg Low
53°F
Warmest
1974
72°F avg
Coldest
1971
53°F avg
About This Date
October 18th in San Mateo, CA typically brings pleasant fall weather, with average highs around 71°F and lows near 53°F. Over 55 years of records, the warmest October 18th was in 1974 (72°F average), while the coldest was 1971 (53°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 4% of October 18th 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 October 18th in San Mateo, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 56° | 66° | — | — |
| 2024 | 73° | 57° | 65° | — | — |
| 2023 | 86° | 58° | 72° | — | — |
| 2022 | 78° | 57° | 68° | — | — |
| 2021 | 61° | 51° | 56° | — | — |
| 2020 | 83° | 58° | 70° | — | — |
| 2019 | 68° | 55° | 62° | — | — |
| 2018 | 69° | 49° | 59° | — | — |
| 2017 | 63° | 48° | 55° | — | — |
| 2016 | 69° | 56° | 62° | — | — |
| 2015 | 69° | 60° | 65° | — | — |
| 2014 | 79° | 65° | 72° | — | — |
| 2013 | 68° | 51° | 60° | — | — |
| 2012 | 86° | 58° | 72° | — | — |
| 2011 | 66° | 56° | 61° | — | — |
| 2010 | 67° | 54° | 60° | — | — |
| 2009 | 64° | 57° | 61° | — | — |
| 2008 | 66° | 52° | 59° | — | — |
| 2007 | 70° | 52° | 61° | — | — |
| 2006 | 73° | 50° | 62° | — | — |
| 2005 | 68° | 60° | 64° | — | — |
| 2004 | 66° | 51° | 59° | — | — |
| 2003 | 69° | 55° | 62° | — | — |
| 2002 | 64° | 55° | 60° | — | — |
| 2001 | 71° | 53° | 62° | — | — |
| 2000 | 64° | 54° | 59° | — | — |
| 1999 | 70° | 50° | 60° | — | — |
| 1998 | 70° | 48° | 59° | — | — |
| 1997 | 64° | 50° | 57° | — | — |
| 1996 | 63° | 51° | 57° | 0.2" | — |
| 1995 | 79° | 52° | 65° | — | — |
| 1994 | 67° | 47° | 57° | — | — |
| 1993 | 68° | 50° | 59° | — | — |
| 1992 | 69° | 56° | 62° | — | — |
| 1991 | 77° | 54° | 65° | — | — |
| 1990 | 70° | 54° | 62° | — | — |
| 1989 | 82° | 54° | 68° | — | — |
| 1988 | 85° | 56° | 70° | — | — |
| 1987 | 74° | 51° | 62° | — | — |
| 1986 | 69° | 51° | 60° | — | — |
| 1985 | 66° | 50° | 58° | — | — |
| 1984 | 64° | 45° | 54° | — | — |
| 1983 | 72° | 54° | 63° | — | — |
| 1982 | 73° | 47° | 60° | — | — |
| 1981 | 73° | 49° | 61° | — | — |
| 1980 | 67° | 46° | 56° | — | — |
| 1979 | 67° | 57° | 62° | 0.18" | — |
| 1978 | 71° | 57° | 64° | — | — |
| 1977 | 67° | 48° | 57° | — | — |
| 1976 | 75° | 47° | 61° | — | — |
| 1975 | 66° | 48° | 57° | — | — |
| 1974warmest | 90° | 54° | 72° | — | — |
| 1973 | 73° | 48° | 61° | — | — |
| 1972 | 70° | 52° | 61° | — | — |
| 1971coldest | 64° | 41° | 53° | — | — |
55 years of data from BURLINGAME