Weather on January 9
Santa Rosa, CA
55 Years of Data
Avg High
57°F
Avg Low
40°F
Warmest
2018
59°F avg
Coldest
1974
40°F avg
About This Date
January 9th in Santa Rosa, CA typically brings cool winter weather, with average highs around 57°F and lows near 40°F. Over 56 years of records, the warmest January 9th was in 2018 (59°F average), while the coldest was 1974 (40°F) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 43% of January 9th dates historically, with the wettest January 9th recording 5.66" of rain. The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.
Planning for January 9th in Santa Rosa, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 63° | 35° | 49° | — | — |
| 2025 | 76° | 33° | 54° | — | — |
| 2024 | 59° | 49° | 54° | 0.38" | — |
| 2023 | 61° | 53° | 57° | 5.66" | — |
| 2022 | 62° | 35° | 49° | — | — |
| 2021 | 61° | 33° | 47° | — | — |
| 2020 | 58° | 42° | 50° | 0.2" | — |
| 2019 | 59° | 53° | 56° | 2.03" | — |
| 2018warmest | 64° | 54° | 59° | 3.76" | — |
| 2017 | 53° | 48° | 51° | — | — |
| 2016 | 48° | 45° | 46° | — | — |
| 2015 | 64° | 46° | 55° | — | — |
| 2014 | 63° | 45° | 54° | — | — |
| 2013 | 49° | 40° | 44° | — | — |
| 2012 | 67° | 29° | 48° | — | — |
| 2011 | 52° | 33° | 42° | — | — |
| 2010 | 54° | 44° | 49° | — | — |
| 2009 | 66° | 34° | 50° | — | — |
| 2008 | 51° | 43° | 47° | — | — |
| 2007 | 67° | 33° | 50° | — | — |
| 2006 | 62° | 34° | 48° | — | — |
| 2005 | 55° | 41° | 48° | 0.25" | — |
| 2004 | 58° | 43° | 50° | 2.06" | — |
| 2003 | 50° | 44° | 47° | 0.76" | — |
| 2002 | 61° | 43° | 52° | 0.03" | — |
| 2001 | 48° | 33° | 41° | 0.33" | — |
| 2000 | 61° | 42° | 51° | — | — |
| 1999 | 51° | 30° | 41° | — | — |
| 1998 | 54° | 46° | 50° | 0.38" | — |
| 1997 | 57° | 35° | 46° | — | — |
| 1996 | 54° | 43° | 48° | — | — |
| 1995 | 61° | 53° | 57° | 5.41" | — |
| 1994 | 59° | 41° | 50° | 0.15" | — |
| 1993 | 51° | 33° | 42° | 0.08" | — |
| 1992 | 56° | 30° | 43° | — | — |
| 1991 | 53° | 46° | 50° | 0.36" | — |
| 1990 | 65° | 51° | 58° | 0.03" | — |
| 1989 | 47° | 42° | 44° | 0.33" | — |
| 1988 | 56° | 50° | 53° | 0.38" | — |
| 1987 | 55° | 36° | 45° | 0.1" | — |
| 1986 | 59° | 35° | 47° | — | — |
| 1985 | 53° | 44° | 49° | 0.94" | — |
| 1984 | 48° | 44° | 46° | — | — |
| 1983 | 68° | 35° | 52° | — | — |
| 1982 | 59° | 29° | 44° | — | — |
| 1981 | 52° | 38° | 45° | — | — |
| 1980 | 56° | 49° | 52° | 0.86" | — |
| 1979 | 59° | 52° | 55° | — | — |
| 1978 | 60° | 43° | 51° | 3.3" | — |
| 1977 | 57° | 28° | 43° | — | — |
| 1976 | 57° | 46° | 52° | 0.86" | — |
| 1975 | 53° | 33° | 43° | — | — |
| 1974coldest | 52° | 29° | 40° | — | — |
| 1973 | 54° | 40° | 47° | 3.61" | — |
| 1972 | 62° | 30° | 46° | — | — |
| 1971 | 56° | 33° | 44° | — | — |
56 years of data from SANTA ROSA