Santa Rosa Weather in January
Average highs run from 30°C on January 1 to 30°C on January 31, and lows from 16°C to 17°C. Normal precipitation for the month is 96 mm over about 9 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
- 32°C
- Average low
- 16°C
- Precipitation
- 96 mm
- Record high
- 46°CJan 6, 1955
- Record low
- 1°CJan 13, 1957
- Daylight
- 14 h 37 min to 13 h 56 min
- Cloud cover
- 44%
- Humidity
- 49%
- Dew point
- 11°C
- Wind
- 8.6 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 | 16°C | 39°C 2007 | 7°C 2013 | 33% |
| Jan 2 | 32°C | 16°C | 40°C 2001 | 4°C 1968 | 33% |
| Jan 3 | 31°C | 17°C | 41°C 1989 | 6°C 1968 | 32% |
| Jan 4 | 16°C | 41°C 1955 | 9°C 1956 | 31% | |
| Jan 5 | 32°C | 17°C | 43°C 1955 | 8°C 1956 | 31% |
| Jan 6 | 32°C | 17°C | 46°C 1955 | 7°C 1954 | 31% |
| Jan 7 | 32°C | 16°C | 42°C 2014 | 10°C 1981 | 30% |
| Jan 8 | 17°C | 42°C 1955 | 3°C 1965 | 29% | |
| Jan 9 | 32°C | 17°C | 42°C 2012 | 5°C 1969 | 28% |
| Jan 10 | 32°C | 16°C | 39°C 1972 | 5°C 1969 | 28% |
| Jan 11 | 32°C | 16°C | 40°C 1955 | 6°C 2008 | 28% |
| Jan 12 | 32°C | 17°C | 38°C 1969 | 7°C 1971 | 28% |
| Jan 13 | 32°C | 16°C | 40°C 2018 | 1°C 1957 | 28% |
| Jan 14 | 31°C | 16°C | 42°C 2022 | 6°C 1957 | 27% |
| Jan 15 | 33°C | 17°C | 40°C 1954 | 5°C 1962 | 28% |
| Jan 16 | 30°C | 16°C | 39°C 1951 | 6°C 1991 | 28% |
| Jan 17 | 31°C | 16°C | 44°C 2014 | 7°C 1959 | 28% |
| Jan 18 | 32°C | 16°C | 45°C 2014 | 5°C 1975 | 29% |
| Jan 19 | 32°C | 16°C | 40°C 2014 | 9°C 1958 | 29% |
| Jan 20 | 32°C | 16°C | 39°C 2018 | 5°C 1967 | 28% |
| Jan 21 | 32°C | 17°C | 42°C 1980 | 3°C 1967 | 28% |
| Jan 22 | 32°C | 17°C | 43°C 2017 | 4°C 1951 | 27% |
| Jan 23 | 32°C | 17°C | 39°C 1972 | 8°C 1965 | 28% |
| Jan 24 | 32°C | 17°C | 40°C 1965 | 5°C 1973 | 27% |
| Jan 25 | 32°C | 16°C | 39°C 1957 | 7°C 1951 | 27% |
| Jan 26 | 32°C | 16°C | 41°C 1990 | 11°C 2017 | 27% |
| Jan 27 | 17°C | 42°C 1957 | 3°C 1964 | 26% | |
| Jan 28 | 32°C | 17°C | 42°C 1957 | 10°C 1959 | 25% |
| Jan 29 | 33°C | 17°C | 42°C 1969 | 6°C 1954 | 25% |
| Jan 30 | 32°C | 17°C | 41°C 1967 | 3°C 1988 | 24% |
| Jan 31 | 30°C | 17°C | 40°C 2024 | 8°C 1978 | 23% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- January 1
- sunrise 6:02 AM, sunset 8:39 PM
- January 31
- sunrise 6:32 AM, sunset 8:28 PM
Other months
Sources
Records: NOAA GHCN-Daily, station AR000087623, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.