Weather on October 31
Sunnyvale, CA
55 Years of Data
Avg High
70°F
Avg Low
50°F
Warmest
2015
68°F avg
Coldest
2003
51°F avg
About This Date
October 31st in Sunnyvale, CA typically brings pleasant fall weather, with average highs around 70°F and lows near 50°F. Over 55 years of records, the warmest October 31st was in 2015 (68°F average), while the coldest was 2003 (51°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 20% of October 31st dates historically. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for October 31st in Sunnyvale, CA? Great weather for outdoor activities.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 54° | 62° | — | — |
| 2024 | 69° | 53° | 61° | — | — |
| 2023 | 76° | 45° | 60° | — | — |
| 2022 | 69° | 51° | 60° | — | — |
| 2021 | 68° | 50° | 59° | — | — |
| 2020 | 77° | 47° | 62° | — | — |
| 2019 | 73° | 42° | 58° | — | — |
| 2018 | 80° | 47° | 63° | — | — |
| 2017 | 71° | 53° | 62° | — | — |
| 2016 | 67° | 51° | 59° | — | — |
| 2015warmest | 82° | 53° | 68° | — | — |
| 2014 | 65° | 55° | 60° | 0.36" | — |
| 2013 | 73° | 45° | 59° | — | — |
| 2012 | 66° | 59° | 63° | 0.33" | — |
| 2011 | 79° | 54° | 66° | — | — |
| 2010 | 71° | 48° | 60° | — | — |
| 2009 | 69° | 52° | 60° | — | — |
| 2008 | 74° | 59° | 66° | 0.36" | — |
| 2007 | 63° | 54° | 58° | — | — |
| 2006 | 62° | 46° | 54° | — | — |
| 2005 | 73° | 46° | 60° | — | — |
| 2004 | 69° | 50° | 60° | — | — |
| 2003coldest | 58° | 45° | 51° | 0.08" | — |
| 2002 | 69° | 41° | 55° | — | — |
| 2001 | 69° | 51° | 60° | — | — |
| 2000 | 67° | 45° | 56° | — | — |
| 1999 | 75° | 47° | 61° | — | — |
| 1998 | 68° | 42° | 55° | — | — |
| 1997 | 73° | 60° | 67° | 0.03" | — |
| 1996 | 63° | 46° | 54° | 0.3" | — |
| 1995 | 67° | 59° | 63° | — | — |
| 1994 | 73° | 44° | 59° | — | — |
| 1993 | 70° | 56° | 63° | — | — |
| 1992 | 73° | 53° | 63° | 0.03" | — |
| 1991 | 72° | 42° | 57° | — | — |
| 1990 | 67° | 53° | 60° | 0.28" | — |
| 1989 | 72° | 44° | 58° | — | — |
| 1988 | 74° | 52° | 63° | — | — |
| 1987 | 69° | 56° | 62° | — | — |
| 1986 | 74° | 51° | 62° | — | — |
| 1985 | 68° | 44° | 56° | — | — |
| 1984 | 69° | 48° | 59° | — | — |
| 1983 | 72° | 63° | 67° | 0.03" | — |
| 1982 | 71° | 47° | 59° | — | — |
| 1981 | 74° | 47° | 60° | — | — |
| 1980 | 75° | 49° | 62° | — | — |
| 1979 | 67° | 52° | 59° | — | — |
| 1978 | 69° | 48° | 59° | — | — |
| 1977 | 68° | 48° | 58° | — | — |
| 1976 | 70° | 48° | 59° | — | — |
| 1975 | 69° | 47° | 58° | — | — |
| 1974 | 60° | 52° | 56° | 0.2" | — |
| 1973 | 77° | 51° | 64° | — | — |
| 1972 | 67° | 42° | 54° | — | — |
| 1971 | 64° | 50° | 57° | 0.08" | — |
55 years of data from MOFFETT FED AIRFIELD