Santa Rosa Weather in January
Average highs run from 30°C on January 1 to 30°C on January 31, and lows from 26°C to 26°C. Normal precipitation for the month is 3 mm over about 0 wet days.
January day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 30°C
- Average low
- 26°C
- Precipitation
- 3 mm
- Record high
- 37°CJan 3, 1965
- Record low
- 19°CJan 7, 1968
- Daylight
- 11 h 32 min to 11 h 40 min
- Cloud cover
- 32%
- Humidity
- 78%
- Dew point
- 23°C
- Wind
- 26.3 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 | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 30°C | 26°C | 33°C 2004 | 22°C 1986 | 8% |
| Jan 2 | 30°C | 26°C | 35°C 1966 | 21°C 1965 | 7% |
| Jan 3 | 30°C | 26°C | 37°C 1965 | 21°C 1976 | 7% |
| Jan 4 | 30°C | 26°C | 34°C 1977 | 22°C 1976 | 6% |
| Jan 5 | 30°C | 26°C | 34°C 2024 | 22°C 1975 | 5% |
| Jan 6 | 30°C | 26°C | 37°C 1965 | 22°C 1975 | 4% |
| Jan 7 | 30°C | 26°C | 35°C 1965 | 19°C 1968 | 4% |
| Jan 8 | 30°C | 26°C | 34°C 2014 | 22°C 1976 | 4% |
| Jan 9 | 30°C | 26°C | 36°C 1966 | 21°C 1976 | 4% |
| Jan 10 | 30°C | 26°C | 35°C 1965 | 20°C 1974 | 3% |
| Jan 11 | 30°C | 26°C | 32°C 1967 | 22°C 1976 | 3% |
| Jan 12 | 30°C | 26°C | 35°C 1966 | 21°C 1976 | 3% |
| Jan 13 | 30°C | 26°C | 33°C 2010 | 21°C 1976 | 3% |
| Jan 14 | 30°C | 26°C | 36°C 1966 | 21°C 1967 | 3% |
| Jan 15 | 30°C | 26°C | 35°C 1966 | 22°C 1974 | 2% |
| Jan 16 | 30°C | 26°C | 33°C 1966 | 21°C 1979 | 2% |
| Jan 17 | 30°C | 26°C | 36°C 1966 | 22°C 2000 | 2% |
| Jan 18 | 30°C | 26°C | 34°C 2010 | 22°C 2017 | 2% |
| Jan 19 | 30°C | 26°C | 36°C 1966 | 21°C 2000 | 2% |
| Jan 20 | 30°C | 26°C | 33°C 1967 | 21°C 1974 | 2% |
| Jan 21 | 30°C | 26°C | 35°C 1965 | 21°C 1967 | 1% |
| Jan 22 | 30°C | 26°C | 35°C 1965 | 22°C 2012 | 1% |
| Jan 23 | 30°C | 26°C | 36°C 1966 | 22°C 1974 | 1% |
| Jan 24 | 30°C | 26°C | 35°C 1965 | 22°C 1974 | 1% |
| Jan 25 | 30°C | 26°C | 35°C 1966 | 21°C 1982 | 1% |
| Jan 26 | 30°C | 26°C | 36°C 1966 | 20°C 1975 | 1% |
| Jan 27 | 30°C | 26°C | 35°C 1965 | 21°C 1968 | 1% |
| Jan 28 | 30°C | 26°C | 35°C 1965 | 21°C 1964 | 1% |
| Jan 29 | 30°C | 26°C | 35°C 1966 | 22°C 1989 | 2% |
| Jan 30 | 30°C | 26°C | 36°C 1966 | 22°C 1999 | 2% |
| Jan 31 | 30°C | 26°C | 32°C 1967 | 21°C 1965 | 2% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- January 1
- sunrise 6:19 AM, sunset 5:51 PM
- January 31
- sunrise 6:25 AM, sunset 6:05 PM
Other months
Sources
Records: NOAA GHCN-Daily, station COM00080022, every year on file, quality-flagged values removed. 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.