Santa Rosa Weather in January
Average highs run from 35°C on January 1 to 33°C on January 31, and lows from 23°C to 22°C. Normal precipitation for the month is 177 mm over about 19 wet days.
January day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
January at a glance
- Average high
- 34°C
- Average low
- 22°C
- Precipitation
- 177 mm
- Reanalysis high
- 43°CJan 25, 2019
- Reanalysis low
- 15°CJan 2, 2013
- Daylight
- 13 h 33 min to 13 h 10 min
- Cloud cover
- 72%
- Humidity
- 66%
- Dew point
- 20°C
- Wind
- 10.8 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 35°C | 23°C | 42°C 2017 | 17°C 2013 | 55% |
| Jan 2 | 35°C | 23°C | 39°C 1995 | 15°C 2013 | 56% |
| Jan 3 | 35°C | 23°C | 40°C 1996 | 17°C 2015 | 57% |
| Jan 4 | 34°C | 23°C | 39°C 2016 | 18°C 2009 | 58% |
| Jan 5 | 34°C | 23°C | 41°C 2018 | 19°C 2009 | 57% |
| Jan 6 | 34°C | 23°C | 42°C 1998 | 19°C 2009 | 57% |
| Jan 7 | 34°C | 22°C | 40°C 2005 | 18°C 2010 | 56% |
| Jan 8 | 34°C | 22°C | 40°C 2006 | 18°C 1998 | 56% |
| Jan 9 | 34°C | 22°C | 40°C 2006 | 19°C 2009 | 55% |
| Jan 10 | 34°C | 22°C | 40°C 2014 | 17°C 1995 | 55% |
| Jan 11 | 34°C | 22°C | 39°C 1996 | 16°C 2001 | 57% |
| Jan 12 | 34°C | 22°C | 40°C 2018 | 16°C 2001 | 59% |
| Jan 13 | 34°C | 22°C | 40°C 2002 | 17°C 2010 | 58% |
| Jan 14 | 34°C | 22°C | 38°C 2011 | 17°C 2010 | 58% |
| Jan 15 | 34°C | 22°C | 40°C 1994 | 18°C 1992 | 58% |
| Jan 16 | 33°C | 22°C | 42°C 2011 | 15°C 1992 | 59% |
| Jan 17 | 33°C | 22°C | 37°C 1998 | 16°C 1991 | 60% |
| Jan 18 | 33°C | 22°C | 38°C 2014 | 17°C 2006 | 59% |
| Jan 19 | 33°C | 22°C | 38°C 2002 | 15°C 2009 | 58% |
| Jan 20 | 33°C | 22°C | 39°C 2002 | 16°C 2009 | 57% |
| Jan 21 | 33°C | 22°C | 39°C 2014 | 18°C 2009 | 57% |
| Jan 22 | 33°C | 22°C | 40°C 2005 | 19°C 2009 | 57% |
| Jan 23 | 33°C | 22°C | 40°C 2014 | 19°C 2003 | 57% |
| Jan 24 | 33°C | 22°C | 40°C 2016 | 19°C 2014 | 57% |
| Jan 25 | 33°C | 22°C | 43°C 2019 | 17°C 2014 | 57% |
| Jan 26 | 33°C | 22°C | 40°C 1998 | 15°C 2014 | 55% |
| Jan 27 | 33°C | 22°C | 39°C 2011 | 19°C 2014 | 55% |
| Jan 28 | 33°C | 22°C | 38°C 2010 | 18°C 2007 | 55% |
| Jan 29 | 33°C | 22°C | 40°C 2010 | 18°C 1998 | 56% |
| Jan 30 | 33°C | 22°C | 40°C 2005 | 18°C 1991 | 55% |
| Jan 31 | 33°C | 22°C | 41°C 2002 | 18°C 2020 | 55% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- January 1
- sunrise 6:35 AM, sunset 8:08 PM
- January 31
- sunrise 6:56 AM, sunset 8:06 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.