Sunnyvale weather in January: Sunnyvale, California: normal highs, lows, rain and records for January
Sunnyvale in January has a normal high of 59°F and a normal low of 42°F, a daily mean of 51°F, rising from 58°F on the 1st to 60°F by the 31st. Measurable precipitation falls on 11 days in a normal January, 2.49 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 15°C and low of 6°C, 63 mm of precipitation in January.
- NOAA stationMoffett Federal Airfield
- Station IDUSW00023244
- Location37.41°N 122.05°W
- Elevation39 ft (12 m)
- From the center2 miles
- Population156,792
- Jan 59° 42°
- Feb 62° 45°
- Mar 65° 47°
- Apr 68° 49°
- May 72° 53°
- Jun 76° 56°
- Jul 77° 59°
- Aug 77° 59°
- Sep 78° 57°
- Oct 74° 53°
- Nov 66° 46°
- Dec 59° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Sunnyvale in January?
The normal high is 59°F and the normal low 42°F, for a daily mean of 50.7°F. January is 0.2°F warmer than December and 2.4°F cooler than February. January is the 11th warmest month of the year in Sunnyvale and the 3rd wettest. Across the month the normal high rises 2°F, from 58°F on January 1 to 60°F on January 31. From one year to the next January's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 49°F and 53°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 58°F | 42°F | 35% | 18% |
| January 8 | 59°F | 42°F | 35% | 17% |
| January 15 | 59°F | 42°F | 35% | 17% |
| January 22 | 59°F | 43°F | 36% | 17% |
| January 31 | 60°F | 43°F | 37% | 18% |
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 | 58°F | 42°F | 35% | 18% | 9 h 40 min |
| January 2 | 58°F | 42°F | 35% | 18% | 9 h 40 min |
| January 3 | 58°F | 42°F | 35% | 18% | 9 h 40 min |
| January 4 | 58°F | 42°F | 35% | 18% | 9 h 40 min |
| January 5 | 58°F | 42°F | 35% | 17% | 9 h 40 min |
| January 6 | 58°F | 42°F | 35% | 17% | 9 h 40 min |
| January 7 | 59°F | 42°F | 35% | 17% | 9 h 40 min |
| January 8 | 59°F | 42°F | 35% | 17% | 9 h 40 min |
| January 9 | 59°F | 42°F | 35% | 17% | 9 h 40 min |
| January 10 | 59°F | 42°F | 35% | 17% | 9 h 40 min |
| January 11 | 59°F | 42°F | 34% | 17% | 9 h 50 min |
| January 12 | 59°F | 42°F | 34% | 17% | 9 h 50 min |
| January 13 | 59°F | 42°F | 34% | 17% | 9 h 50 min |
| January 14 | 59°F | 42°F | 35% | 17% | 9 h 50 min |
| January 15 | 59°F | 42°F | 35% | 17% | 9 h 50 min |
| January 16 | 59°F | 42°F | 35% | 17% | 9 h 50 min |
| January 17 | 59°F | 42°F | 35% | 17% | 9 h 50 min |
| January 18 | 59°F | 42°F | 35% | 17% | 9 h 50 min |
| January 19 | 59°F | 43°F | 35% | 17% | 10 h |
| January 20 | 59°F | 43°F | 35% | 17% | 10 h |
| January 21 | 59°F | 43°F | 35% | 17% | 10 h |
| January 22 | 59°F | 43°F | 36% | 17% | 10 h |
| January 23 | 59°F | 43°F | 36% | 17% | 10 h |
| January 24 | 59°F | 43°F | 36% | 17% | 10 h |
| January 25 | 60°F | 43°F | 36% | 17% | 10 h 10 min |
| January 26 | 60°F | 43°F | 36% | 18% | 10 h 10 min |
| January 27 | 60°F | 43°F | 36% | 18% | 10 h 10 min |
| January 28 | 60°F | 43°F | 36% | 18% | 10 h 10 min |
| January 29 | 60°F | 43°F | 37% | 18% | 10 h 10 min |
| January 30 | 60°F | 43°F | 37% | 18% | 10 h 10 min |
| January 31 | 60°F | 43°F | 37% | 18% | 10 h 20 min |
- Normal high
- 59°FJanuary average
- Normal low
- 42°FJanuary average
- Precipitation
- 2.49 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 9 h 40 min to 10 h 20 minJanuary 1 to January 31
- Days at 70°F or more
- 1
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023244; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Sunnyvale in January?
On a given January day the chance of 0.01 inch or more is 35% on average, highest around January 31 (37%). In all, 2.49 in falls on 11 days of a normal January.
In a normal January in Sunnyvale, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023244.
What are the records for January in Sunnyvale?
The warmest January temperature on this station's record (since 1945) is 76°F, on January 24, 1948; the coldest is 21°F, on January 5, 1949. The wettest January brought 6.81 in (1978); the snowiest, 1.8 inches (1962).
The January mean against the 1991-2020 normal of 50.7°F: 2025 50.9°F (+0.2), 2026 53.6°F (+2.9). 2 of 2 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2025 | 50.9°F | +0.2°F | – |
| 2026 | 53.6°F | +2.9°F | – |
Source: records: ACIS, station USW00023244; recent months: ACIS, station USW00023244. Records and recent months use complete months only.
How does January in Sunnyvale 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; Sunnyvale's is 59°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.