Weather on March 18
Santa Rosa, CA
55 Years of Data
Avg High
68°F
Avg Low
43°F
Warmest
2026
69°F avg
Coldest
2012
44°F avg
About This Date
March 18th in Santa Rosa, CA typically brings mild spring weather, with average highs around 68°F and lows near 43°F — a 25°F daily swing. Over 56 years of records, the warmest March 18th was in 2026 (69°F average), while the coldest was 2012 (44°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 30% of March 18th dates historically, with the wettest March 18th recording 4.75" of rain. The last decade has been 3.1°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.1°F cooler on this date compared to 20-30 years ago.
Planning for March 18th in Santa Rosa, CA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 89° | 49° | 69° | — | — |
| 2025 | 63° | 37° | 50° | 0.2" | — |
| 2024 | 69° | 45° | 57° | — | — |
| 2023 | 68° | 39° | 54° | — | — |
| 2022 | 71° | 39° | 55° | — | — |
| 2021 | 56° | 46° | 51° | 2.82" | — |
| 2020 | 55° | 45° | 50° | 0.23" | — |
| 2019 | 78° | 40° | 59° | — | — |
| 2018 | 59° | 33° | 46° | — | — |
| 2017 | 64° | 51° | 58° | — | — |
| 2016 | 64° | 47° | 55° | — | — |
| 2015 | 73° | 49° | 61° | — | — |
| 2014 | 71° | 51° | 61° | — | — |
| 2013 | 67° | 44° | 55° | — | — |
| 2012coldest | 53° | 35° | 44° | — | — |
| 2011 | 55° | 41° | 48° | 1.55" | — |
| 2010 | 84° | 40° | 62° | — | — |
| 2009 | 78° | 47° | 62° | — | — |
| 2008 | 71° | 42° | 57° | — | — |
| 2007 | 70° | 41° | 55° | — | — |
| 2006 | 64° | 35° | 50° | 0.05" | — |
| 2005 | 61° | 50° | 55° | 0.69" | — |
| 2004 | 83° | 46° | 64° | — | — |
| 2003 | 68° | 37° | 53° | — | — |
| 2002 | 63° | 38° | 50° | — | — |
| 2001 | 77° | 52° | 64° | — | — |
| 2000 | 75° | 42° | 59° | — | — |
| 1999 | 57° | 44° | 51° | — | — |
| 1998 | 72° | 45° | 58° | — | — |
| 1997 | 73° | 46° | 60° | 0.03" | — |
| 1996 | 83° | 50° | 66° | — | — |
| 1995 | 64° | 49° | 56° | — | — |
| 1994 | 62° | 45° | 53° | — | — |
| 1993 | 66° | 53° | 60° | 0.84" | — |
| 1992 | 66° | 42° | 54° | — | — |
| 1991 | 57° | 42° | 50° | 0.41" | — |
| 1990 | 67° | 47° | 57° | — | — |
| 1989 | 58° | 50° | 54° | 4.75" | — |
| 1988 | 75° | 38° | 56° | — | — |
| 1987 | 60° | 39° | 50° | 0.03" | — |
| 1986 | 71° | 40° | 55° | — | — |
| 1985 | 56° | 43° | 49° | 0.43" | — |
| 1984 | 70° | 44° | 57° | — | — |
| 1983 | 63° | 38° | 50° | 2.97" | — |
| 1982 | 59° | 37° | 48° | 0.03" | — |
| 1981 | 70° | 40° | 55° | — | — |
| 1980 | 65° | 39° | 52° | — | — |
| 1979 | 63° | 38° | 50° | 0.05" | — |
| 1978 | 80° | 45° | 62° | — | — |
| 1977 | 68° | 35° | 52° | — | — |
| 1976 | 63° | 48° | 55° | 0.43" | — |
| 1975 | 59° | 50° | 55° | 0.81" | — |
| 1974 | 75° | 44° | 60° | — | — |
| 1973 | 62° | 30° | 46° | — | — |
| 1972 | 75° | 41° | 58° | — | — |
| 1971 | 74° | 40° | 57° | — | — |
56 years of data from SANTA ROSA