Weather on March 18
Sunnyvale, CA
55 Years of Data
Avg High
66°F
Avg Low
48°F
Warmest
2026
73°F avg
Coldest
1982
47°F avg
About This Date
March 18th in Sunnyvale, CA typically brings mild spring weather, with average highs around 66°F and lows near 48°F. Over 56 years of records, the warmest March 18th was in 2026 (73°F average), while the coldest was 1982 (47°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 27% of March 18th dates historically, with the wettest March 18th recording 1.04" of rain. The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.8°F cooler on this date compared to 20-30 years ago.
Planning for March 18th in Sunnyvale, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 84° | 61° | 73° | — | — |
| 2025 | 59° | 43° | 51° | — | — |
| 2024 | 72° | 46° | 59° | — | — |
| 2023 | 71° | 44° | 58° | — | — |
| 2022 | 72° | 43° | 57° | — | — |
| 2021 | 61° | 50° | 55° | 0.33" | — |
| 2020 | 55° | 42° | 49° | 0.05" | — |
| 2019 | 75° | 49° | 62° | — | — |
| 2018 | 57° | 40° | 48° | — | — |
| 2017 | 70° | 50° | 60° | — | — |
| 2016 | 65° | 53° | 59° | — | — |
| 2015 | 71° | 48° | 60° | — | — |
| 2014 | 72° | 47° | 59° | — | — |
| 2013 | 64° | 44° | 54° | — | — |
| 2012 | 54° | 44° | 49° | 0.05" | — |
| 2011 | 58° | 45° | 51° | 1.04" | — |
| 2010 | 75° | 47° | 61° | — | — |
| 2009 | 71° | 49° | 60° | — | — |
| 2008 | 66° | 47° | 56° | — | — |
| 2007 | 66° | 47° | 56° | — | — |
| 2006 | 61° | 43° | 52° | — | — |
| 2005 | 59° | 54° | 56° | 0.66" | — |
| 2004 | 80° | 53° | 67° | — | — |
| 2003 | 64° | 43° | 53° | — | — |
| 2002 | 60° | 38° | 49° | — | — |
| 2001 | 75° | 52° | 63° | — | — |
| 2000 | 72° | 47° | 59° | — | — |
| 1999 | 61° | 45° | 53° | — | — |
| 1998 | 75° | 47° | 61° | — | — |
| 1997 | 77° | 51° | 64° | — | — |
| 1996 | 80° | 53° | 67° | — | — |
| 1995 | 65° | 53° | 59° | 0.13" | — |
| 1994 | 65° | 50° | 57° | — | — |
| 1993 | 66° | 55° | 61° | 0.03" | — |
| 1992 | 70° | 47° | 58° | — | — |
| 1991 | 59° | 44° | 52° | — | — |
| 1990 | 65° | 53° | 59° | — | — |
| 1989 | 61° | 55° | 58° | 0.25" | — |
| 1988 | 76° | 47° | 61° | — | — |
| 1987 | 57° | 48° | 53° | 0.36" | — |
| 1986 | 69° | 48° | 59° | — | — |
| 1985 | 61° | 48° | 54° | 0.56" | — |
| 1984 | 66° | 47° | 56° | — | — |
| 1983 | 59° | 48° | 54° | 0.08" | — |
| 1982coldest | 55° | 40° | 47° | 0.58" | — |
| 1981 | 58° | 47° | 52° | 1.02" | — |
| 1980 | 64° | 47° | 55° | — | — |
| 1979 | 60° | 48° | 54° | 0.53" | — |
| 1978 | 77° | 57° | 67° | — | — |
| 1977 | 62° | 45° | 53° | — | — |
| 1976 | 66° | 52° | 59° | 0.18" | — |
| 1975 | 66° | 48° | 57° | — | — |
| 1974 | 68° | 51° | 60° | — | — |
| 1973 | 61° | 40° | 50° | — | — |
| 1972 | 69° | 49° | 59° | — | — |
| 1971 | 66° | 48° | 57° | — | — |
56 years of data from MOFFETT FED AIRFIELD