Wing-Chi Poon / CC BY-SA 2.5
Concord, CA Weather on August 18
August 18th in Concord, CA typically brings warm summer weather, with average highs around 86°F and lows near 57°F — a 29°F daily swing. Over 55 years of records, the warmest August 18th was in 2020 (88°F average), while the coldest was 1976 (64°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 18th dates historically. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
What to Expect on August 18
Planning for August 18th in Concord, CA? Stay hydrated and seek shade during peak afternoon hours.
August 18 Weather Records for Concord
- •The all-time record high for August 18th in Concord, CA is 106°F, set in 2020.
- •The coldest August 18th on record dropped to 45°F in 1973.
- •Temperatures have reached 90°F or higher on August 18th in 18 of the last 55 years.
- •Last year (1971), August 18th was 5°F warmer than the long-term average.
Frequently Asked Questions
What was the warmest August 18 ever in Concord?
The warmest August 18 in Concord, CA reached 106°F in 2020. That is 20°F above the long-term average high of 86°F.
What was the coldest August 18 ever in Concord?
The coldest August 18 in Concord, CA dropped to 45°F in 1973. That is 12°F below the long-term average low of 57°F.
What is the average temperature on August 18 in Concord?
On August 18, Concord averages a high of 86°F and a low of 57°F based on 55 years of NOAA weather observations from CONCORD BUCHANAN FLD.
How many years of weather data are available for August 18 in Concord?
We have 55 years of weather records for August 18 in Concord, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
August 18 Weather History in Concord
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 84°F | 58°F | 0" | -- |
| 2024 | 83°F | 60°F | 0" | -- |
| 2023 | 83°F | 63°F | 0" | -- |
| 2022 | 94°F | 60°F | 0" | -- |
| 2021 | 84°F | 58°F | 0" | -- |
| 2020 | 106°F | 71°F | 0" | -- |
| 2019 | 85°F | 58°F | 0" | -- |
| 2018 | 99°F | 56°F | 0" | -- |
| 2017 | 89°F | 61°F | 0" | -- |
| 2016 | 90°F | 58°F | 0" | -- |
| 2015 | 88°F | 61°F | 0" | -- |
| 2014 | 85°F | 59°F | 0" | -- |
| 2013 | 97°F | 58°F | 0" | -- |
| 2012 | 92°F | 59°F | 0" | -- |
| 2011 | 89°F | 57°F | 0" | -- |
| 2010 | 82°F | 57°F | 0" | -- |
| 2009 | 88°F | 56°F | 0" | -- |
| 2008 | 72°F | 59°F | 0" | -- |
| 2007 | 84°F | 59°F | 0" | -- |
| 2006 | 88°F | 56°F | 0" | -- |
| 2005 | 74°F | 58°F | 0" | -- |
| 2004 | 97°F | 60°F | 0" | -- |
| 2003 | 90°F | 60°F | 0" | -- |
| 2002 | 86°F | 54°F | 0" | -- |
| 2001 | 94°F | 58°F | 0" | -- |
| 2000 | 87°F | 58°F | 0" | -- |
| 1999 | 74°F | 56°F | 0" | -- |
| 1998 | 75°F | 57°F | 0" | -- |
| 1997 | 82°F | 60°F | 0" | -- |
| 1996 | 84°F | 55°F | 0" | -- |
| 1995 | 90°F | 56°F | 0" | -- |
| 1994 | 86°F | 57°F | 0" | -- |
| 1993 | 89°F | 59°F | 0" | -- |
| 1992 | 93°F | 56°F | 0" | -- |
| 1991 | 82°F | 53°F | 0" | -- |
| 1990 | 81°F | 61°F | 0" | -- |
| 1989 | 80°F | 55°F | 0" | -- |
| 1988 | 94°F | 57°F | 0" | -- |
| 1987 | 78°F | 50°F | 0" | -- |
| 1986 | 96°F | 51°F | 0" | -- |
| 1985 | 83°F | 57°F | 0" | -- |
| 1984 | 99°F | 66°F | 0" | -- |
| 1983 | 80°F | 57°F | 0" | -- |
| 1982 | 90°F | 54°F | 0" | -- |
| 1981 | 74°F | 59°F | 0" | -- |
| 1980 | 75°F | 54°F | 0" | -- |
| 1979 | 84°F | 55°F | 0" | -- |
| 1978 | 97°F | 53°F | 0" | -- |
| 1977 | 86°F | 54°F | 0" | -- |
| 1976 | 70°F | 58°F | 0.1" | -- |
| 1975 | 80°F | 60°F | 0.04" | -- |
| 1974 | 86°F | 56°F | 0" | -- |
| 1973 | 91°F | 45°F | 0" | -- |
| 1972 | 84°F | 55°F | 0" | -- |
| 1971 | 91°F | 48°F | 0" | -- |
Based on 55 years of data from NOAA station: CONCORD BUCHANAN FLD
Monthly Climate Averages
Historical temperature and precipitation averages for Concord, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.