Gilroy weather in January: Gilroy, California: normal highs, lows, rain and records for January
Gilroy in January has a normal high of 61°F and a normal low of 38°F, a daily mean of 49°F, rising from 60°F on the 1st to 62°F by the 31st. Measurable precipitation falls on 10 days in a normal January, 4.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 16°C and low of 3°C, 116 mm of precipitation in January.
- NOAA stationGilroy
- Station IDUSC00043417
- Location37.00°N 121.56°W
- Elevation194 ft (59 m)
- From the center1 miles
- Population60,390
- Jan 61° 38°
- Feb 64° 40°
- Mar 68° 43°
- Apr 72° 45°
- May 77° 49°
- Jun 83° 52°
- Jul 87° 54°
- Aug 87° 54°
- Sep 85° 53°
- Oct 79° 48°
- Nov 68° 42°
- Dec 60° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Gilroy in January?
The normal high is 61°F and the normal low 38°F, for a daily mean of 49.4°F. January is 0.7°F warmer than December and 2.8°F cooler than February. January is the 11th warmest month of the year in Gilroy and the wettest. Across the month the normal high rises 2°F, from 60°F on January 1 to 62°F on January 31. From one year to the next January's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 47°F and 52°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 60°F | 37°F | 30% | 21% |
| January 8 | 60°F | 38°F | 30% | 21% |
| January 15 | 61°F | 38°F | 31% | 21% |
| January 22 | 61°F | 39°F | 32% | 21% |
| January 31 | 62°F | 39°F | 33% | 21% |
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 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 2 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 3 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 4 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 5 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 6 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 7 | 60°F | 37°F | 30% | 21% | 9 h 40 min |
| January 8 | 60°F | 38°F | 30% | 21% | 9 h 50 min |
| January 9 | 60°F | 38°F | 30% | 21% | 9 h 50 min |
| January 10 | 60°F | 38°F | 30% | 21% | 9 h 50 min |
| January 11 | 60°F | 38°F | 30% | 21% | 9 h 50 min |
| January 12 | 60°F | 38°F | 30% | 21% | 9 h 50 min |
| January 13 | 60°F | 38°F | 30% | 21% | 9 h 50 min |
| January 14 | 61°F | 38°F | 31% | 21% | 9 h 50 min |
| January 15 | 61°F | 38°F | 31% | 21% | 9 h 50 min |
| January 16 | 61°F | 38°F | 31% | 21% | 9 h 50 min |
| January 17 | 61°F | 38°F | 31% | 21% | 10 h |
| January 18 | 61°F | 38°F | 31% | 21% | 10 h |
| January 19 | 61°F | 38°F | 31% | 21% | 10 h |
| January 20 | 61°F | 38°F | 31% | 21% | 10 h |
| January 21 | 61°F | 39°F | 31% | 21% | 10 h |
| January 22 | 61°F | 39°F | 32% | 21% | 10 h |
| January 23 | 61°F | 39°F | 32% | 21% | 10 h |
| January 24 | 61°F | 39°F | 32% | 21% | 10 h 10 min |
| January 25 | 61°F | 39°F | 32% | 21% | 10 h 10 min |
| January 26 | 62°F | 39°F | 32% | 21% | 10 h 10 min |
| January 27 | 62°F | 39°F | 32% | 21% | 10 h 10 min |
| January 28 | 62°F | 39°F | 32% | 21% | 10 h 10 min |
| January 29 | 62°F | 39°F | 32% | 21% | 10 h 10 min |
| January 30 | 62°F | 39°F | 32% | 21% | 10 h 20 min |
| January 31 | 62°F | 39°F | 33% | 21% | 10 h 20 min |
- Normal high
- 61°FJanuary average
- Normal low
- 38°FJanuary average
- Precipitation
- 4.55 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 5
- Daylight
- 9 h 40 min to 10 h 20 minJanuary 1 to January 31
- Days at 70°F or more
- 3
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00043417; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Gilroy in January?
On a given January day the chance of 0.01 inch or more is 31% on average, highest around January 31 (33%). In all, 4.55 in falls on 10 days of a normal January, 1 of them with an inch or more.
In a normal January in Gilroy, 5 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043417.
What are the records for January in Gilroy?
The warmest January temperature on this station's record (since 1957) is 80°F, on January 19, 2014; the coldest is 18°F, on January 15, 1963. The wettest January brought 14.64 in (1914).
The January mean against the 1991-2020 normal of 49.4°F: 2021 51.9°F (+2.5), 2022 52.5°F (+3.1), 2023 51.0°F (+1.6). 3 of 3 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.9°F | +2.5°F | 2.71 in |
| 2022 | 52.5°F | +3.1°F | 0.00 in |
| 2023 | 51.0°F | +1.6°F | 8.25 in |
Source: records: ACIS, station USC00043417; recent months: ACIS, station USC00043417. Records and recent months use complete months only.
How does January in Gilroy 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; Gilroy's is 61°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.