San Mateo County, CA
An ordinary day in San Mateo County, CA: was cooler than 31 of 75 earlier years in the county average (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- Tuesday 29 September 2026: a high of 73.3°F averaged over San Mateo County, CA, the warmest 29 September in the county average since 2023, 32nd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 50.8°F averaged over San Mateo County, CA, the coldest 29 September night in the county average since 2021, tied 26th coldest of 76 (with 1959) (county average from NOAA gridded data, 1951 to 2026).
- No measurable precipitation in the county average of San Mateo County, CA for 25 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
The month
- September 2026 so far averaged 64.7°F in San Mateo County, CA, the warmest 1 to 29 September in the county average since 2025, 20th warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- August 2026 averaged 65°F in San Mateo County, CA, the warmest August in the county average since 2025, tied 17th warmest of 132 (with 2013) (county average from NOAA's monthly county data, 1895 to 2026).
- Days of the month without a value
- 0
Every year on this date
- Above the normal range
- In it
- Below it
- Normal range
- This year and the extreme
Every year as a table
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 73.3 | 50.8 |
| 2025 | 64.7 | 59.7 |
| 2024 | 71.2 | 52.7 |
| 2023 | 76.5 | 51.8 |
| 2022 | 73.1 | 51.7 |
| 2021 | 71.6 | 50.5 |
| 2020 | 90.5 | 62.9 |
| 2019 | 64.8 | 47.5 |
| 2018 | 63.5 | 51.5 |
| 2017 | 84.2 | 55 |
| 2016 | 76.2 | 52.3 |
| 2015 | 70.9 | 52.3 |
| 2014 | 71.2 | 56.3 |
| 2013 | 80.3 | 53.4 |
| 2012 | 63.1 | 51.1 |
| 2011 | 87.7 | 62.6 |
| 2010 | 96.2 | 67.7 |
| 2009 | 63.6 | 50.4 |
| 2008 | 73.5 | 53.3 |
| 2007 | 61.9 | 45.4 |
| 2006 | 66 | 52 |
| 2005 | 84.2 | 54.9 |
| 2004 | 66.7 | 51.2 |
| 2003 | 67 | 52 |
| 2002 | 65.5 | 48.3 |
| 2001 | 73.2 | 49.4 |
| 2000 | 62.2 | 49.7 |
| 1999 | 85.3 | 61.4 |
| 1998 | 66.3 | 51.6 |
| 1997 | 87.2 | 61.4 |
| 1996 | 71.2 | 50.9 |
| 1995 | 68.6 | 50.9 |
| 1994 | 72.1 | 51.2 |
| 1993 | 79 | 55.2 |
| 1992 | 80.7 | 56.1 |
| 1991 | 75.9 | 51.6 |
| 1990 | 76.9 | 55.3 |
| 1989 | 66.7 | 54 |
| 1988 | 81.6 | 50.5 |
| 1987 | 77.7 | 53.9 |
| 1986 | 72.2 | 46.9 |
| 1985 | 63.9 | 51.8 |
| 1984 | 81.9 | 55.5 |
| 1983 | 68.9 | 53.2 |
| 1982 | 68.5 | 48.8 |
| 1981 | 70.4 | 46.2 |
| 1980 | 76 | 51.1 |
| 1979 | 75.4 | 52.9 |
| 1978 | 84.3 | 54.2 |
| 1977 | 68.3 | 57.5 |
| 1976 | 60.7 | 57 |
| 1975 | 68.2 | 49.5 |
| 1974 | 69.1 | 49.4 |
| 1973 | 83.8 | 50.9 |
| 1972 | 75.4 | 54.1 |
| 1971 | 64.2 | 46.2 |
| 1970 | 86.3 | 53.3 |
| 1969 | 77.4 | 54.4 |
| 1968 | 70.9 | 50 |
| 1967 | 69.5 | 54.7 |
| 1966 | 90.4 | 59.3 |
| 1965 | 71.4 | 45.7 |
| 1964 | 66.8 | 47.2 |
| 1963 | 76.3 | 53.8 |
| 1962 | 69.9 | 50.5 |
| 1961 | 70.3 | 44.5 |
| 1960 | 65.6 | 49.9 |
| 1959 | 73.9 | 50.8 |
| 1958 | 83.2 | 52.8 |
| 1957 | 68.8 | 54.7 |
| 1956 | 83.1 | 49.3 |
| 1955 | 65.4 | 42.4 |
| 1954 | 65.3 | 47.4 |
| 1953 | 73 | 46.3 |
| 1952 | 75.8 | 49.8 |
| 1951 | 66.1 | 53.6 |
Nearby
San Francisco Airport, CA 14.2 mi, the nearest city with its own station