Weather on September 18
Santa Clara, CA
55 Years of Data
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.
| 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° | — | — |
Santa Clara, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Santa Clara, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Santa Clara, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Santa Clara, CA
Santa Clara, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.