Weather on December 18
San Leandro, CA
55 Years of Data
Avg High
57°F
Avg Low
43°F
Warmest
1994
63°F avg
Coldest
2016
39°F avg
About This Date
December 18th in San Leandro, CA typically brings cool winter weather, with average highs around 57°F and lows near 43°F. Over 53 years of records, the warmest December 18th was in 1994 (63°F average), while the coldest was 2016 (39°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 17% of December 18th dates historically, with the wettest December 18th recording 1.83" of rain. The last decade has been 3.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.9°F cooler on this date compared to 20-30 years ago.
Planning for December 18th in San Leandro, CA? Bring layers as temperatures can vary throughout the day.
Cooling Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 55° | 48° | 52° | — | — |
| 2024 | 51° | 46° | 49° | — | — |
| 2023 | 61° | 45° | 53° | — | — |
| 2022 | 49° | 34° | 41° | — | — |
| 2021 | 46° | 35° | 41° | — | — |
| 2020 | 55° | 43° | 49° | — | — |
| 2019 | 52° | 43° | 47° | — | — |
| 2018 | 58° | 47° | 52° | — | — |
| 2017 | 56° | 43° | 49° | — | — |
| 2016coldest | 45° | 34° | 39° | — | — |
| 2015 | 54° | 46° | 50° | — | — |
| 2014 | 56° | 46° | 51° | — | — |
| 2013 | 59° | 44° | 52° | — | — |
| 2012 | 47° | 36° | 41° | — | — |
| 2011 | 48° | 43° | 45° | — | — |
| 2010 | 53° | 49° | 51° | — | — |
| 2009 | 57° | 47° | 52° | — | — |
| 2008 | 54° | 36° | 45° | 0.08" | — |
| 2007 | 50° | 43° | 46° | — | — |
| 2006 | 57° | 33° | 45° | — | — |
| 2005 | 57° | 47° | 52° | — | — |
| 2004 | 59° | 50° | 55° | — | — |
| 2003 | 56° | 43° | 49° | — | — |
| 2002 | 54° | 40° | 47° | — | — |
| 2001 | 57° | 41° | 49° | — | — |
| 2000 | 53° | 45° | 49° | — | — |
| 1999 | 56° | 46° | 51° | — | — |
| 1998 | 64° | 45° | 54° | — | — |
| 1997 | 57° | 44° | 51° | — | — |
| 1996 | 54° | 54° | 54° | — | — |
| 1995 | 57° | 55° | 56° | — | — |
| 1994warmest | 69° | 57° | 63° | — | — |
| 1993 | 48° | 41° | 45° | — | — |
| 1992 | 51° | 35° | 43° | — | — |
| 1989 | 55° | 40° | 47° | — | — |
| 1988 | 66° | 42° | 54° | — | — |
| 1987 | 58° | 38° | 48° | 0.03" | — |
| 1986 | 66° | 44° | 55° | 0.33" | — |
| 1985 | 62° | 38° | 50° | — | — |
| 1984 | 51° | 40° | 45° | — | — |
| 1983 | 62° | 47° | 54° | 0.03" | — |
| 1982 | 60° | 42° | 51° | — | — |
| 1981 | 65° | 48° | 56° | 0.1" | — |
| 1980 | 69° | 50° | 60° | — | — |
| 1979 | 67° | 43° | 55° | — | — |
| 1978 | 50° | 43° | 46° | 0.89" | — |
| 1977 | 56° | 40° | 48° | 1.83" | — |
| 1976 | 69° | 49° | 59° | — | — |
| 1975 | 62° | 35° | 49° | — | — |
| 1974 | 60° | 38° | 49° | — | — |
| 1973 | 59° | 37° | 48° | 0.08" | — |
| 1972 | 54° | 39° | 46° | 1.75" | — |
| 1971 | 56° | 32° | 44° | — | — |
53 years of data from UPPER SAN LEANDRO FILTERS