Petaluma weather in January: Petaluma, California: normal highs, lows, rain and records for January
Petaluma in January has a normal high of 58°F and a normal low of 39°F, a daily mean of 48°F, rising from 57°F on the 1st to 59°F by the 31st. Measurable precipitation falls on 12 days in a normal January, 4.77 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 4°C, 121 mm of precipitation in January.
- NOAA stationPetaluma Airport
- Station IDUSC00046826
- Location38.26°N 122.61°W
- Elevation20 ft (6 m)
- Population59,393
- Jan 58° 39°
- Feb 61° 40°
- Mar 65° 42°
- Apr 68° 44°
- May 72° 47°
- Jun 78° 50°
- Jul 81° 52°
- Aug 81° 53°
- Sep 82° 51°
- Oct 76° 48°
- Nov 66° 42°
- Dec 58° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Petaluma in January?
The normal high is 58°F and the normal low 39°F, for a daily mean of 48.3°F. January is 0.2°F warmer than December and 2.5°F cooler than February. January is the 11th warmest month of the year in Petaluma and the 3rd wettest. Across the month the normal high rises 2°F, from 57°F on January 1 to 59°F on January 31. From one year to the next January's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 46°F and 51°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 39%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 57°F | 38°F | 39% | 28% |
| January 8 | 57°F | 39°F | 39% | 27% |
| January 15 | 57°F | 39°F | 38% | 27% |
| January 22 | 58°F | 39°F | 38% | 27% |
| January 31 | 59°F | 40°F | 37% | 26% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 31, coldest night January 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| January 2 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| January 3 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| January 4 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| January 5 | 57°F | 38°F | 39% | 28% | 9 h 40 min |
| January 6 | 57°F | 38°F | 39% | 27% | 9 h 40 min |
| January 7 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 8 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 9 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 10 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 11 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 12 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 13 | 57°F | 39°F | 39% | 27% | 9 h 40 min |
| January 14 | 57°F | 39°F | 38% | 27% | 9 h 50 min |
| January 15 | 57°F | 39°F | 38% | 27% | 9 h 50 min |
| January 16 | 57°F | 39°F | 38% | 27% | 9 h 50 min |
| January 17 | 58°F | 39°F | 38% | 27% | 9 h 50 min |
| January 18 | 58°F | 39°F | 38% | 27% | 9 h 50 min |
| January 19 | 58°F | 39°F | 38% | 26% | 9 h 50 min |
| January 20 | 58°F | 39°F | 38% | 26% | 9 h 50 min |
| January 21 | 58°F | 39°F | 38% | 27% | 10 h |
| January 22 | 58°F | 39°F | 38% | 27% | 10 h |
| January 23 | 58°F | 39°F | 38% | 27% | 10 h |
| January 24 | 58°F | 40°F | 38% | 26% | 10 h |
| January 25 | 58°F | 40°F | 38% | 26% | 10 h |
| January 26 | 58°F | 40°F | 38% | 26% | 10 h |
| January 27 | 59°F | 40°F | 38% | 26% | 10 h 10 min |
| January 28 | 59°F | 40°F | 38% | 26% | 10 h 10 min |
| January 29 | 59°F | 40°F | 38% | 26% | 10 h 10 min |
| January 30 | 59°F | 40°F | 37% | 26% | 10 h 10 min |
| January 31 | 59°F | 40°F | 37% | 26% | 10 h 10 min |
- Normal high
- 58°FJanuary average
- Normal low
- 39°FJanuary average
- Precipitation
- 4.77 inmonth total
- Days with precipitation
- 120.01 inch or more
- Nights at 32°F or colder
- 6
- Daylight
- 9 h 30 min to 10 h 10 minJanuary 1 to January 31
- Days at 70°F or more
- 1
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046826; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Petaluma in January?
On a given January day the chance of 0.01 inch or more is 38% on average, highest around January 1 (39%). In all, 4.77 in falls on 12 days of a normal January, 1 of them with an inch or more.
In a normal January in Petaluma, 6 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046826.
What are the records for January in Petaluma?
The warmest January temperature on this station's record (since 1893) is 85°F, on January 8, 1962; the coldest is 18°F, on January 1, 1919. The wettest January brought 16.59 in (1916); the snowiest, 1.5 inches (1916).
The January mean against the 1991-2020 normal of 48.3°F: 2021 50.4°F (+2.1), 2022 50.2°F (+1.9), 2023 50.0°F (+1.7), 2024 51.7°F (+3.4), 2025 49.9°F (+1.6), 2026 50.7°F (+2.4). 6 of 6 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.4°F | +2.1°F | 3.66 in |
| 2022 | 50.2°F | +1.9°F | 0.66 in |
| 2023 | 50.0°F | +1.7°F | 9.58 in |
| 2024 | 51.7°F | +3.4°F | 5.55 in |
| 2025 | 49.9°F | +1.6°F | 1.13 in |
| 2026 | 50.7°F | +2.4°F | 3.06 in |
Source: records: ACIS, station USC00046826; recent months: ACIS, station USC00046826. Records and recent months use complete months only.
How does January in Petaluma compare across California?
Across the 219 places PlainClimate covers in California, January normal highs run from 37°F in Tahoma to 72°F in Brawley; Petaluma's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.