Cotati Weather in January
Average highs run from 57°F on January 1 to 59°F on January 31, and lows from 38°F to 40°F. Normal precipitation for the month is 4.77 in over about 12 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 58°F
- Average low
- 39°F
- Precipitation
- 4.77 in
- Record high
- 85°FJan 8, 1962
- Record low
- 18°FJan 1, 1919
- Chance of a freeze
- 80%
- Daylight
- 9 h 33 min to 10 h 15 min
- Cloud cover
- 59%
- Humidity
- 84%
- Dew point
- 41°F
- Wind
- 6.5 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 57°F | 38°F | 74°F 1996 | 18°F 1919 | 39% |
| Jan 2 | 57°F | 38°F | 69°F 1930 | 19°F 1919 | 39% |
| Jan 3 | 57°F | 38°F | 69°F 1930 | 19°F 1919 | 39% |
| Jan 4 | 57°F | 38°F | 69°F 1934 | 20°F 1919 | 39% |
| Jan 5 | 57°F | 38°F | 67°F 1934 | 22°F 1949 | 39% |
| Jan 6 | 57°F | 38°F | 74°F 2003 | 22°F 1919 | 39% |
| Jan 7 | 57°F | 39°F | 75°F 1925 | 21°F 1919 | 39% |
| Jan 8 | 57°F | 39°F | 85°F 1962 | 19°F 1937 | 39% |
| Jan 9 | 57°F | 39°F | 82°F 1962 | 18°F 1937 | 39% |
| Jan 10 | 57°F | 39°F | 73°F 1962 | 24°F 1920 | 39% |
| Jan 11 | 57°F | 39°F | 80°F 2009 | 23°F 1963 | 39% |
| Jan 12 | 57°F | 39°F | 80°F 2009 | 26°F 1920 | 39% |
| Jan 13 | 57°F | 39°F | 70°F 1967 | 20°F 1963 | 39% |
| Jan 14 | 57°F | 39°F | 70°F 1924 | 21°F 2007 | 38% |
| Jan 15 | 57°F | 39°F | 72°F 1966 | 21°F 2007 | 38% |
| Jan 16 | 57°F | 39°F | 77°F 1920 | 23°F 2007 | 38% |
| Jan 17 | 58°F | 39°F | 75°F 1991 | 21°F 1917 | 38% |
| Jan 18 | 58°F | 39°F | 80°F 2021 | 23°F 1943 | 38% |
| Jan 19 | 58°F | 39°F | 78°F 2021 | 24°F 1917 | 38% |
| Jan 20 | 58°F | 39°F | 78°F 2021 | 21°F 1963 | 38% |
| Jan 21 | 58°F | 39°F | 70°F 1988 | 20°F 1937 | 38% |
| Jan 22 | 58°F | 39°F | 72°F 2022 | 20°F 1937 | 38% |
| Jan 23 | 58°F | 39°F | 79°F 1974 | 21°F 1937 | 38% |
| Jan 24 | 58°F | 40°F | 74°F 1984 | 23°F 1962 | 38% |
| Jan 25 | 58°F | 40°F | 76°F 1934 | 23°F 1937 | 38% |
| Jan 26 | 58°F | 40°F | 75°F 1934 | 26°F 1937 | 38% |
| Jan 27 | 59°F | 40°F | 70°F 1934 | 25°F 1948 | 38% |
| Jan 28 | 59°F | 40°F | 70°F 1934 | 25°F 1948 | 38% |
| Jan 29 | 59°F | 40°F | 69°F 1993 | 21°F 1957 | 38% |
| Jan 30 | 59°F | 40°F | 71°F 1976 | 22°F 1975 | 37% |
| Jan 31 | 59°F | 40°F | 76°F 2015 | 22°F 1918 | 37% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:28 AM, sunset 5:01 PM
- January 31
- sunrise 7:17 AM, sunset 5:32 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046826 (Petaluma AP), public domain. Records: NOAA GHCN-Daily, station USC00046826, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.