Weather on April 18
San Mateo, CA
55 Years of Data
Avg High
65°F
Avg Low
48°F
Warmest
2016
69°F avg
Coldest
1975
48°F avg
About This Date
April 18th in San Mateo, CA typically brings mild spring weather, with average highs around 65°F and lows near 48°F. Over 55 years of records, the warmest April 18th was in 2016 (69°F average), while the coldest was 1975 (48°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 15% of April 18th dates historically, with the wettest April 18th recording 1.07" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for April 18th in San Mateo, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 64° | 51° | 58° | — | — |
| 2024 | 71° | 52° | 61° | — | — |
| 2023 | 59° | 47° | 53° | — | — |
| 2022 | 68° | 45° | 56° | — | — |
| 2021 | 76° | 48° | 62° | — | — |
| 2020 | 65° | 54° | 59° | — | — |
| 2019 | 78° | 50° | 64° | — | — |
| 2018 | 60° | 51° | 56° | — | — |
| 2017 | 67° | 52° | 59° | 0.03" | — |
| 2016warmest | 82° | 56° | 69° | — | — |
| 2015 | 67° | 49° | 58° | — | — |
| 2014 | 63° | 52° | 57° | — | — |
| 2013 | 73° | 47° | 60° | — | — |
| 2012 | 65° | 51° | 58° | — | — |
| 2011 | 62° | 53° | 58° | 0.08" | — |
| 2010 | 76° | 48° | 62° | — | — |
| 2009 | 71° | 47° | 59° | — | — |
| 2008 | 61° | 48° | 54° | — | — |
| 2007 | 58° | 46° | 52° | — | — |
| 2006 | 65° | 44° | 54° | — | — |
| 2005 | 63° | 47° | 55° | — | — |
| 2004 | 58° | 48° | 53° | 0.1" | — |
| 2003 | 61° | 50° | 55° | — | — |
| 2002 | 59° | 45° | 52° | — | — |
| 2001 | 65° | 50° | 57° | 0.1" | — |
| 2000 | 63° | 48° | 55° | — | — |
| 1999 | 64° | 50° | 57° | — | — |
| 1998 | 63° | 50° | 56° | — | — |
| 1997 | 69° | 55° | 62° | 0.66" | — |
| 1996 | 62° | 48° | 55° | — | — |
| 1995 | 58° | 44° | 51° | — | — |
| 1994 | 69° | 53° | 61° | — | — |
| 1993 | 63° | 51° | 57° | — | — |
| 1992 | 73° | 50° | 62° | — | — |
| 1991 | 60° | 48° | 54° | — | — |
| 1990 | 61° | 51° | 56° | — | — |
| 1989 | 73° | 49° | 61° | — | — |
| 1988 | 66° | 51° | 59° | — | — |
| 1987 | 60° | 48° | 54° | — | — |
| 1986 | 69° | 47° | 58° | — | — |
| 1985 | 62° | 49° | 55° | — | — |
| 1984 | 62° | 47° | 54° | 1.07" | — |
| 1983 | 62° | 53° | 58° | 0.89" | — |
| 1982 | 68° | 48° | 58° | — | — |
| 1981 | 54° | 50° | 52° | 0.28" | — |
| 1980 | 64° | 50° | 57° | — | — |
| 1979 | 58° | 44° | 51° | — | — |
| 1978 | 67° | 44° | 55° | — | — |
| 1977 | 72° | 39° | 55° | — | — |
| 1976 | 65° | 48° | 56° | — | — |
| 1975coldest | 58° | 38° | 48° | — | — |
| 1974 | 58° | 46° | 52° | — | — |
| 1973 | 60° | 45° | 52° | — | — |
| 1972 | 62° | 41° | 52° | — | — |
| 1971 | 60° | 48° | 54° | — | — |
55 years of data from BURLINGAME