Weather on August 18
San Jose, CA
55 Years of Data
Avg High
80°F
Avg Low
58°F
Warmest
2020
83°F avg
Coldest
1999
63°F avg
About This Date
August 18th in San Jose, CA typically brings warm summer weather, with average highs around 80°F and lows near 58°F. Over 55 years of records, the warmest August 18th was in 2020 (83°F average), while the coldest was 1999 (63°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 18th dates historically, with the wettest August 18th recording 1.73" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in San Jose, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 57° | 69° | — | — |
| 2024 | 80° | 64° | 72° | — | — |
| 2023 | 86° | 64° | 75° | — | — |
| 2022 | 84° | 61° | 72° | — | — |
| 2021 | 78° | 59° | 69° | — | — |
| 2020warmest | 97° | 70° | 83° | — | — |
| 2019 | 79° | 60° | 69° | — | — |
| 2018 | 86° | 58° | 72° | — | — |
| 2017 | 83° | 61° | 72° | — | — |
| 2016 | 80° | 61° | 70° | — | — |
| 2015 | 81° | 58° | 69° | — | — |
| 2014 | 76° | 59° | 67° | — | — |
| 2013 | 91° | 58° | 74° | — | — |
| 2012 | 81° | 59° | 70° | — | — |
| 2011 | 79° | 57° | 68° | — | — |
| 2010 | 74° | 58° | 66° | — | — |
| 2009 | 79° | 59° | 69° | — | — |
| 2008 | 75° | 61° | 68° | — | — |
| 2007 | 77° | 56° | 66° | — | — |
| 2006 | 78° | 57° | 68° | — | — |
| 2005 | 75° | 57° | 66° | — | — |
| 2004 | 87° | 59° | 73° | — | — |
| 2003 | 84° | 60° | 72° | — | — |
| 2002 | 79° | — | — | — | — |
| 2001 | 80° | 55° | 68° | — | — |
| 2000 | 81° | 55° | 68° | — | — |
| 1999coldest | 69° | 58° | 63° | — | — |
| 1998 | 75° | 56° | 65° | — | — |
| 1997 | 78° | 61° | 69° | — | — |
| 1996 | 83° | 55° | 69° | — | — |
| 1995 | 87° | 54° | 70° | — | — |
| 1994 | 83° | 57° | 70° | — | — |
| 1993 | 84° | 59° | 72° | — | — |
| 1992 | 83° | 60° | 71° | — | — |
| 1991 | 74° | 60° | 67° | — | — |
| 1990 | 77° | 62° | 70° | — | — |
| 1989 | 78° | 60° | 69° | — | — |
| 1988 | 90° | 58° | 74° | — | — |
| 1987 | 80° | 60° | 70° | — | — |
| 1986 | 86° | 57° | 72° | — | — |
| 1985 | 78° | 52° | 65° | — | — |
| 1984 | 88° | 61° | 74° | — | — |
| 1983 | 78° | 61° | 69° | — | — |
| 1982 | 78° | 56° | 67° | — | — |
| 1981 | 72° | 57° | 64° | — | — |
| 1980 | 78° | 56° | 67° | — | — |
| 1979 | 80° | 56° | 68° | — | — |
| 1978 | 90° | 57° | 73° | — | — |
| 1977 | 75° | 59° | 67° | — | — |
| 1976 | 70° | 58° | 64° | 0.58" | — |
| 1975 | 73° | 59° | 66° | 1.73" | — |
| 1974 | 80° | 51° | 66° | — | — |
| 1973 | 79° | 50° | 64° | — | — |
| 1972 | 79° | 55° | 67° | — | — |
| 1971 | 85° | 53° | 69° | — | — |
55 years of data from SAN JOSE