March is one of the cooler months of the year in Santa Rosa, with average highs near 15.8°C and lows around 5.1°C (mean 10.5°C). It is a relatively wet time of year, averaging 109 mm of rainfall and 81% relative humidity across the period.
March is one of the cooler months of the year in Santa Rosa. Across 45 years of records, the warmest March in Santa Rosa was 2004 — when the month averaged 13.6°C — while the coldest was 2006 at 7.3°C. Typical March days reach 15.8°C with nights near 5.1°C. The long-term March temperature trend is broadly flat.
March is a relatively wet time of year in Santa Rosa, averaging 109 mm of rainfall. The wettest March on record was 1995 with 340 mm, while the driest was 1988 at 2 mm.
Relative humidity in Santa Rosa during March averages 81%. The most humid March was 1983 at 90%, and the least humid was 2021 at 70%.
March receives about 4.6 kWh/m²/day of solar energy in Santa Rosa. The sunniest March was 1988 at 5.4 kWh/m²/day, and the cloudiest were 2006 and 2011 at 3.6.
Average wind speed in Santa Rosa during March is 1.6 m/s. The windiest March was 1991 at 2.1 m/s, while the calmest were 1992, 1993 and 2015 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.1°C | 10.4°C | 10.8°C | 10.7°C | 10.2°C | +0.1°C |
| Avg High | 15.2°C | 15.7°C | 16.4°C | 15.8°C | 15.5°C | +0.3°C |
| Avg Low | 4.9°C | 5.2°C | 5.2°C | 5.5°C | 4.8°C | -0.1°C |
| Avg Rain | 141 mm | 116 mm | 73 mm | 124 mm | 82 mm | -59 mm |
March temperatures in Santa Rosa have risen by about 0.7°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -2.2°C (2002) to a record high of 26°C (2025).
Rainfall in March is a relatively wet time of year, averaging 109 mm, with a wettest year of 340 mm.
A quieter season to visit Santa Rosa
If your dates are flexible, the more temperate months of September and July tend to be the most comfortable for visiting Santa Rosa. That said, March — with days averaging 15.8°C and nights around 5.1°C (mean 10.5°C) and higher rainfall (109 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.2°C | 10.3°C | 5.3°C | 26.0°C | 0.8°C | 66 mm | 84% | 1.8 m/s | 4.3 |
| 2024 | 14.9°C | 10.3°C | 5.6°C | 21.2°C | 2.3°C | 94 mm | 85% | 1.8 m/s | 4.3 |
| 2023 | 12.2°C | 7.8°C | 3.4°C | 17.3°C | -1.2°C | 223 mm | 84% | 1.8 m/s | 4 |
| 2022 | 18.7°C | 12.3°C | 5.9°C | 25.4°C | 1.8°C | 25 mm | 74% | 1.5 m/s | 5.2 |
| 2021 | 16.5°C | 10.1°C | 3.7°C | 25.4°C | 0.4°C | 46 mm | 70% | 1.8 m/s | 5.1 |
| 2020 | 15.6°C | 10.2°C | 4.7°C | 24.4°C | 0.4°C | 37 mm | 77% | 1.6 m/s | 4.3 |
| 2019 | 14.2°C | 9.5°C | 4.9°C | 21.3°C | 1.6°C | 140 mm | 84% | 1.5 m/s | 4.2 |
| 2018 | 15.0°C | 9.7°C | 4.3°C | 24.7°C | -0.4°C | 149 mm | 80% | 1.7 m/s | 4.4 |
| 2017 | 16.7°C | 11.6°C | 6.6°C | 22.9°C | 0.5°C | 87 mm | 83% | 1.6 m/s | 4.5 |
| 2016 | 16.3°C | 11.4°C | 6.5°C | 22.1°C | 2.4°C | 210 mm | 85% | 1.8 m/s | 4.1 |
| 2015 | 19.2°C | 13.3°C | 7.3°C | 23.9°C | 1.8°C | 5 mm | 77% | 1.3 m/s | 5.1 |
| 2014 | 17.6°C | 12.3°C | 6.9°C | 23.7°C | 3.8°C | 89 mm | 77% | 1.6 m/s | 4.5 |
| 2013 | 17.3°C | 11.3°C | 5.2°C | 22.5°C | 0.9°C | 36 mm | 79% | 1.4 m/s | 4.7 |
| 2012 | 14.0°C | 9.0°C | 4.1°C | 21.1°C | -0.2°C | 199 mm | 80% | 1.8 m/s | 3.9 |
| 2011 | 13.4°C | 9.1°C | 4.9°C | 22.8°C | 1.9°C | 240 mm | 88% | 1.8 m/s | 3.6 |
| 2010 | 14.7°C | 9.3°C | 4.0°C | 22.2°C | -0.7°C | 82 mm | 82% | 1.6 m/s | 4.7 |
| 2009 | 15.6°C | 9.9°C | 4.2°C | 22.2°C | -1.9°C | 80 mm | 80% | 1.7 m/s | 4.9 |
| 2008 | 15.9°C | 9.7°C | 3.6°C | 20.5°C | -0.5°C | 5 mm | 78% | 1.5 m/s | 5.2 |
| 2007 | 18.8°C | 12.3°C | 5.8°C | 24.1°C | -0.5°C | 8 mm | 77% | 1.4 m/s | 5.1 |
| 2006 ❄️ | 11.1°C | 7.3°C | 3.5°C | 16.0°C | -1.1°C | 227 mm | 88% | 1.7 m/s | 3.6 |
| 2005 | 16.7°C | 11.6°C | 6.4°C | 23.8°C | 2.0°C | 126 mm | 82% | 1.7 m/s | 4.5 |
| 2004 🔥 | 19.7°C | 13.6°C | 7.5°C | 24.4°C | 3.5°C | 32 mm | 77% | 1.5 m/s | 5.2 |
| 2003 | 16.8°C | 11.1°C | 5.3°C | 23.0°C | 1.3°C | 69 mm | 83% | 1.6 m/s | 5.1 |
| 2002 | 15.3°C | 9.6°C | 3.8°C | 23.8°C | -2.2°C | 62 mm | 78% | 1.6 m/s | 4.9 |
| 2001 | 18.0°C | 12.3°C | 6.5°C | 24.3°C | 2.2°C | 56 mm | 81% | 1.5 m/s | 4.8 |
| 2000 | 16.2°C | 10.7°C | 5.2°C | 22.4°C | 2.2°C | 60 mm | 81% | 1.6 m/s | 4.9 |
| 1999 | 13.1°C | 8.1°C | 3.2°C | 17.5°C | -0.7°C | 87 mm | 84% | 1.5 m/s | 4.5 |
| 1998 | 15.2°C | 10.2°C | 5.2°C | 20.6°C | -0.3°C | 87 mm | 83% | 1.4 m/s | 4.3 |
| 1997 | 17.8°C | 11.8°C | 5.8°C | 22.7°C | -0.2°C | 29 mm | 77% | 1.5 m/s | 5 |
| 1996 | 16.6°C | 11.1°C | 5.6°C | 22.5°C | 0.6°C | 73 mm | 81% | 1.6 m/s | 4.9 |
| 1995 🌧️ | 13.8°C | 9.3°C | 4.7°C | 18.0°C | 0.8°C | 340 mm | 85% | 1.9 m/s | 4 |
| 1994 | 17.4°C | 11.2°C | 5.1°C | 21.9°C | 1.2°C | 12 mm | 77% | 1.4 m/s | 5 |
| 1993 | 17.0°C | 12.0°C | 6.9°C | 21.7°C | 2.7°C | 76 mm | 86% | 1.3 m/s | 4.2 |
| 1992 | 16.4°C | 11.6°C | 6.8°C | 21.6°C | 4.1°C | 116 mm | 84% | 1.3 m/s | 4.4 |
| 1991 | 12.8°C | 8.1°C | 3.4°C | 18.9°C | -1.0°C | 310 mm | 85% | 2.1 m/s | 4 |
| 1990 | 16.8°C | 10.9°C | 4.9°C | 21.6°C | 0.0°C | 35 mm | 80% | 1.4 m/s | 4.9 |
| 1989 | 14.4°C | 10.0°C | 5.6°C | 19.2°C | -1.6°C | 213 mm | 86% | 1.8 m/s | 4 |
| 1988 | 18.2°C | 11.3°C | 4.4°C | 24.9°C | 0.7°C | 2 mm | 71% | 1.8 m/s | 5.4 |
| 1987 | 15.0°C | 9.7°C | 4.4°C | 21.7°C | 0.1°C | 125 mm | 80% | 1.7 m/s | 4.5 |
| 1986 | 17.4°C | 12.1°C | 6.9°C | 23.2°C | 0.6°C | 171 mm | 84% | 1.6 m/s | 4.5 |
| 1985 | 14.2°C | 8.6°C | 3.0°C | 21.0°C | -1.1°C | 116 mm | 80% | 1.8 m/s | 4.8 |
| 1984 | 16.5°C | 10.9°C | 5.3°C | 21.6°C | 1.8°C | 52 mm | 80% | 1.7 m/s | 4.8 |
| 1983 | 13.1°C | 9.7°C | 6.2°C | 16.3°C | 1.6°C | 299 mm | 90% | 1.8 m/s | — |
| 1982 | 12.9°C | 8.3°C | 3.8°C | 18.1°C | 0.7°C | 187 mm | 85% | 1.7 m/s | — |
| 1981 | 15.3°C | 9.9°C | 4.5°C | 20.8°C | 0.4°C | 103 mm | 81% | 1.6 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 15.8°C with lows near 5.1°C (mean 10.5°C), based on 45 years of NASA POWER data.
March averages 109 mm of rainfall in Santa Rosa, a relatively wet time of year. The wettest on record was 340 mm in 1995.
The hottest March reached 26°C in 2025. The coldest dipped to -2.2°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 0.7°C. Daytime highs moved from 14.4°C to 15.5°C and overnight lows from 4.6°C to 4.8°C over the same span.
March is one of the cooler months of the year in Santa Rosa and a relatively wet time of year, so plan for around 15.8°C daytime highs and 5.1°C at night.
Not quite — March is the 4th coolest month in Santa Rosa, averaging 10.5°C.
For March in Santa Rosa, pack warm layers and a jacket for chilly mornings, with typical highs of 15.8°C and lows of 5.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 81% — quite humid.
Average wind speed in March is 1.6 m/s. The windiest March on record averaged 2.1 m/s (1991).
The wettest March on record was 1995 with 340 mm. On average, March sees 109 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Santa Rosa behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
