Weather on June 18
San Mateo, CA
55 Years of Data
Avg High
73°F
Avg Low
54°F
Warmest
2017
79°F avg
Coldest
1991
54°F avg
About This Date
June 18th in San Mateo, CA typically brings pleasant summer weather, with average highs around 73°F and lows near 54°F. Over 55 years of records, the warmest June 18th was in 2017 (79°F average), while the coldest was 1991 (54°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 4% of June 18th dates historically. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for June 18th in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 52° | 60° | — | — |
| 2024 | 72° | 53° | 62° | — | — |
| 2023 | 69° | 57° | 63° | — | — |
| 2022 | 67° | 55° | 61° | — | — |
| 2021 | 84° | 60° | 72° | — | — |
| 2020 | 86° | 55° | 71° | — | — |
| 2019 | 70° | 58° | 64° | — | — |
| 2018 | 71° | 56° | 63° | — | — |
| 2017warmest | 97° | 62° | 79° | — | — |
| 2016 | 72° | 56° | 64° | — | — |
| 2015 | 67° | 52° | 59° | — | — |
| 2014 | 86° | 55° | 71° | — | — |
| 2013 | 65° | 54° | 59° | — | — |
| 2012 | 71° | 54° | 62° | — | — |
| 2011 | 69° | 52° | 60° | — | — |
| 2010 | 62° | 53° | 58° | — | — |
| 2009 | 75° | 56° | 65° | — | — |
| 2008 | 79° | 52° | 65° | — | — |
| 2007 | 74° | 51° | 62° | — | — |
| 2006 | 66° | 53° | 60° | — | — |
| 2005 | 71° | 57° | 64° | 0.1" | — |
| 2004 | 72° | 59° | 65° | — | — |
| 2003 | 66° | 52° | 59° | — | — |
| 2002 | 66° | 55° | 61° | — | — |
| 2001 | 82° | 54° | 68° | — | — |
| 2000 | 73° | 57° | 65° | — | — |
| 1999 | 66° | 52° | 59° | — | — |
| 1998 | 70° | 54° | 62° | — | — |
| 1997 | 70° | 54° | 62° | — | — |
| 1996 | 73° | 49° | 61° | — | — |
| 1995 | 64° | 53° | 59° | — | — |
| 1994 | 74° | 50° | 62° | — | — |
| 1993 | 87° | 58° | 72° | — | — |
| 1992 | 66° | 54° | 60° | — | — |
| 1991coldest | 57° | 50° | 54° | — | — |
| 1990 | 70° | 53° | 61° | — | — |
| 1989 | 72° | 53° | 62° | — | — |
| 1988 | 84° | 54° | 69° | — | — |
| 1987 | 69° | 54° | 61° | — | — |
| 1986 | 69° | 54° | 61° | — | — |
| 1985 | 71° | 55° | 63° | — | — |
| 1984 | 70° | 49° | 59° | — | — |
| 1983 | 69° | 51° | 60° | — | — |
| 1982 | 69° | 54° | 61° | — | — |
| 1981 | 88° | 56° | 72° | — | — |
| 1980 | 65° | 52° | 58° | — | — |
| 1979 | 74° | 49° | 61° | — | — |
| 1978 | 71° | 55° | 63° | — | — |
| 1977 | 64° | 53° | 59° | — | — |
| 1976 | 99° | 50° | 74° | — | — |
| 1975 | 68° | 46° | 57° | — | — |
| 1974 | 70° | 50° | 60° | 0.38" | — |
| 1973 | 83° | 49° | 66° | — | — |
| 1972 | 81° | 49° | 65° | — | — |
| 1971 | 87° | 56° | 71° | — | — |
55 years of data from BURLINGAME