Contra Costa County, CA
An ordinary day in Contra Costa 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.
- High
- 81.7°F
- Warmest since 2024
- 32nd warmest of 76
- Low
- 51.1°F
- Coldest since 2021
- 15th coldest of 76
No measurable precipitation in the county average of Contra Costa County, CA for 25 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 51.8 to 62.5°F
Every year as a table
Every 29 September high of the county average in Contra Costa County, CA since 1951: 81.7°F in 2026; the highest is 99.1°F, in 2010.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 81.7 | 51.1 |
| 2025 | 70.6 | 57.9 |
| 2024 | 85.9 | 54.5 |
| 2023 | 79.7 | 52.5 |
| 2022 | 81.6 | 55.4 |
| 2021 | 77.2 | 50.9 |
| 2020 | 95.6 | 66.2 |
| 2019 | 69.8 | 45.7 |
| 2018 | 75 | 52.8 |
| 2017 | 88.6 | 57.4 |
| 2016 | 86.3 | 56.1 |
| 2015 | 81 | 54.2 |
| 2014 | 74.8 | 54.1 |
| 2013 | 82.3 | 54.2 |
| 2012 | 81.7 | 56.6 |
| 2011 | 91.4 | 61.7 |
| 2010 | 99.1 | 67.7 |
| 2009 | 76.9 | 52.8 |
| 2008 | 87.2 | 56.4 |
| 2007 | 65.9 | 48 |
| 2006 | 77.9 | 52 |
| 2005 | 90.4 | 58.1 |
| 2004 | 72.4 | 52.2 |
| 2003 | 76.2 | 53.7 |
| 2002 | 71.1 | 50.8 |
| 2001 | 79.9 | 52 |
| 2000 | 71.8 | 51.9 |
| 1999 | 89.8 | 62.5 |
| 1998 | 73 | 53.5 |
| 1997 | 90.6 | 62.5 |
| 1996 | 83 | 55 |
| 1995 | 73.8 | 52.6 |
| 1994 | 76.9 | 55.4 |
| 1993 | 90.2 | 60.8 |
| 1992 | 90.8 | 60.3 |
| 1991 | 86.8 | 55.8 |
| 1990 | 87.4 | 58.6 |
| 1989 | 72.1 | 56.2 |
| 1988 | 88.7 | 55.7 |
| 1987 | 89.2 | 57.9 |
| 1986 | 75.1 | 49.7 |
| 1985 | 71.9 | 52.6 |
| 1984 | 89.1 | 59.6 |
| 1983 | 76.9 | 55.7 |
| 1982 | 75 | 50.9 |
| 1981 | 74.3 | 51.7 |
| 1980 | 83.1 | 53.1 |
| 1979 | 85.6 | 56.2 |
| 1978 | 89.7 | 57.8 |
| 1977 | 74 | 58.8 |
| 1976 | 67.4 | 58.4 |
| 1975 | 79.3 | 51.6 |
| 1974 | 77.1 | 50.6 |
| 1973 | 91.9 | 54.7 |
| 1972 | 79.1 | 56 |
| 1971 | 69.6 | 49.8 |
| 1970 | 91.7 | 57.5 |
| 1969 | 85 | 57.4 |
| 1968 | 83.8 | 53.6 |
| 1967 | 80.5 | 59.8 |
| 1966 | 95.2 | 62.7 |
| 1965 | 74.9 | 47.8 |
| 1964 | 72.2 | 49.7 |
| 1963 | 88.3 | 59.4 |
| 1962 | 72.7 | 55 |
| 1961 | 78.3 | 47.9 |
| 1960 | 77.6 | 51.6 |
| 1959 | 77.1 | 54.8 |
| 1958 | 92.3 | 58 |
| 1957 | 70.6 | 56.9 |
| 1956 | 88.8 | 54.3 |
| 1955 | 73.7 | 45.5 |
| 1954 | 76.6 | 50.8 |
| 1953 | 79 | 50.4 |
| 1952 | 88.3 | 55.8 |
| 1951 | 71 | 55.5 |
The month
September 2026 so far averaged 68.8°F in Contra Costa County, CA, the coldest 1 to 29 September in the county average since 2023, 23rd coldest of 76 (county average from NOAA gridded data, 1951 to 2026).
The month in words
- August 2026 averaged 73.9°F in Contra Costa County, CA, the warmest August in the county average since 2025, 9th warmest of 132 (county average from NOAA's monthly county data, 1895 to 2026).
- Tuesday 29 September 2026: a high of 81.7°F averaged over Contra Costa County, CA, the warmest 29 September in the county average since 2024, tied 32nd warmest of 76 (with 2012) (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 51.1°F averaged over Contra Costa County, CA, the coldest 29 September night in the county average since 2021, 15th coldest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
San Francisco Airport, CA 29.8 mi, the nearest city with its own station