Weather on August 18
Santa Rosa, CA
55 Years of Data
Avg High
81°F
Avg Low
53°F
Warmest
2020
82°F avg
Coldest
1980
58°F avg
About This Date
August 18th in Santa Rosa, CA typically brings warm summer weather, with average highs around 81°F and lows near 53°F — a 28°F daily swing. Over 55 years of records, the warmest August 18th was in 2020 (82°F average), while the coldest was 1980 (58°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 5% of August 18th dates historically. The last decade has been 4.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.4°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Santa Rosa, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 54° | 69° | — | — |
| 2024 | 84° | 55° | 70° | — | — |
| 2023 | 80° | 61° | 70° | 0.08" | — |
| 2022 | 93° | 52° | 72° | — | — |
| 2021 | 85° | 53° | 69° | — | — |
| 2020warmest | 100° | 64° | 82° | — | — |
| 2019 | 80° | 58° | 69° | — | — |
| 2018 | 88° | 49° | 68° | — | — |
| 2017 | 76° | 53° | 64° | — | — |
| 2016 | 80° | 53° | 67° | — | — |
| 2015 | 77° | 55° | 66° | — | — |
| 2014 | 73° | 54° | 63° | — | — |
| 2013 | 90° | 57° | 73° | — | — |
| 2012 | 82° | 57° | 70° | — | — |
| 2011 | 76° | 51° | 63° | — | — |
| 2010 | 74° | 53° | 63° | — | — |
| 2009 | 79° | 50° | 64° | — | — |
| 2008 | 68° | 51° | 60° | — | — |
| 2007 | 82° | 51° | 67° | — | — |
| 2006 | 77° | 51° | 64° | — | — |
| 2005 | 69° | 52° | 60° | — | — |
| 2004 | 92° | 53° | 72° | — | — |
| 2003 | 85° | 52° | 68° | — | — |
| 2002 | 69° | 51° | 60° | — | — |
| 2001 | 86° | 52° | 69° | — | — |
| 2000 | 88° | 53° | 70° | — | — |
| 1999 | 71° | 54° | 62° | — | — |
| 1998 | 76° | 52° | 64° | — | — |
| 1997 | 76° | 55° | 65° | — | — |
| 1996 | 81° | 52° | 66° | — | — |
| 1995 | 86° | 54° | 70° | — | — |
| 1994 | 78° | 51° | 65° | — | — |
| 1993 | 87° | 52° | 69° | — | — |
| 1992 | 88° | 52° | 70° | — | — |
| 1991 | 71° | 53° | 62° | — | — |
| 1990 | 78° | 61° | 69° | — | — |
| 1989 | 73° | 53° | 63° | — | — |
| 1988 | 95° | 55° | 75° | — | — |
| 1987 | 72° | 51° | 61° | — | — |
| 1986 | 82° | 48° | 65° | — | — |
| 1985 | 73° | 47° | 60° | — | — |
| 1984 | 90° | 56° | 73° | — | — |
| 1983 | 77° | 55° | 66° | — | — |
| 1982 | 86° | 51° | 69° | — | — |
| 1981 | 78° | 53° | 66° | — | — |
| 1980coldest | 65° | 51° | 58° | — | — |
| 1979 | 77° | 50° | 64° | — | — |
| 1978 | 96° | 49° | 72° | — | — |
| 1977 | 85° | 57° | 71° | — | — |
| 1976 | 67° | 57° | 62° | 0.43" | — |
| 1975 | 73° | 56° | 64° | 0.05" | — |
| 1974 | 89° | 47° | 68° | — | — |
| 1973 | 80° | 44° | 62° | — | — |
| 1972 | 83° | 51° | 67° | — | — |
| 1971 | 89° | 50° | 70° | — | — |
55 years of data from SANTA ROSA