Weather on September 18
Santa Clara, CA
55 Years of Data
Avg High
79°F
Avg Low
57°F
Warmest
1984
80°F avg
Coldest
1978
61°F avg
About This Date
September 18th in Santa Clara, CA typically brings pleasant fall weather, with average highs around 79°F and lows near 57°F. Over 55 years of records, the warmest September 18th was in 1984 (80°F average), while the coldest was 1978 (61°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 18th dates historically, with the wettest September 18th recording 1.3" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 18th in Santa Clara, CA? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 64° | 74° | — | — |
| 2024 | 78° | 62° | 70° | — | — |
| 2023 | 79° | 58° | 68° | — | — |
| 2022 | 73° | 61° | 67° | 1.3" | — |
| 2021 | 77° | 55° | 66° | — | — |
| 2020 | 79° | 64° | 71° | — | — |
| 2019 | 76° | 58° | 67° | — | — |
| 2018 | 75° | 49° | 62° | — | — |
| 2017 | 80° | 60° | 70° | — | — |
| 2016 | 93° | 58° | 75° | — | — |
| 2015 | 81° | 54° | 67° | — | — |
| 2014 | 80° | 64° | 72° | — | — |
| 2013 | 83° | 55° | 69° | — | — |
| 2012 | 69° | 54° | 61° | — | — |
| 2011 | 88° | 55° | 71° | — | — |
| 2010 | 77° | 63° | 70° | — | — |
| 2009 | 95° | 61° | 78° | — | — |
| 2008 | 72° | 50° | 61° | — | — |
| 2007 | 74° | 57° | 65° | — | — |
| 2006 | 85° | 59° | 72° | — | — |
| 2005 | 78° | 52° | 65° | — | — |
| 2004 | 67° | 55° | 61° | — | — |
| 2003 | 89° | 54° | 71° | — | — |
| 2002 | 88° | 58° | 73° | — | — |
| 2001 | 75° | 55° | 65° | — | — |
| 2000 | 98° | 62° | 80° | — | — |
| 1999 | 72° | 57° | 64° | — | — |
| 1998 | 77° | 59° | 68° | — | — |
| 1997 | 79° | 62° | 70° | — | — |
| 1996 | 84° | 55° | 70° | — | — |
| 1995 | 92° | 57° | 74° | — | — |
| 1994 | 79° | 60° | 69° | — | — |
| 1993 | 73° | 53° | 63° | — | — |
| 1992 | 79° | 58° | 68° | — | — |
| 1991 | 81° | 59° | 70° | — | — |
| 1990 | 80° | 59° | 70° | — | — |
| 1989 | 68° | 56° | 62° | 0.3" | — |
| 1988 | 85° | 59° | 72° | — | — |
| 1987 | 81° | 56° | 68° | — | — |
| 1986 | 73° | 51° | 62° | — | — |
| 1985 | 76° | 55° | 65° | — | — |
| 1984warmest | 92° | 68° | 80° | — | — |
| 1983 | 78° | 56° | 67° | — | — |
| 1982 | 74° | 58° | 66° | — | — |
| 1981 | 75° | 58° | 66° | — | — |
| 1980 | 79° | 58° | 68° | — | — |
| 1979 | 80° | 58° | 69° | — | — |
| 1978coldest | 72° | 51° | 61° | — | — |
| 1977 | 76° | 55° | 65° | — | — |
| 1976 | 77° | 53° | 65° | — | — |
| 1975 | 73° | 54° | 63° | — | — |
| 1974 | 80° | 54° | 67° | — | — |
| 1973 | 76° | 52° | 64° | — | — |
| 1972 | 77° | 50° | 64° | — | — |
| 1971 | 83° | 59° | 71° | — | — |
55 years of data from SANTA CLARA UNIV