San Jose, California weather in January
Temperature, rain and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Fair
Best time to visit: April – October
What is the weather like in San Jose, California in January?
In January, San Jose, California is cool: daytime highs average 15 °C, and nights cool down to about 6 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 135 mm in total. All in all, January is a so-so month for a holiday in San Jose, California.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 55 | 59 | 66 |
| Day | 14° | 15° | 15° |
| Night | 7° | 6° | 7° |
| Sun | 5 h | 5 h | 6 h |
| Rain days | 10 | 9 | 9 |
More details for January
- Daylight
- 9 h 51 min07:21 – 17:12
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC−8America/Los_Angeles
How the score comes together
- Temperatureweight 50 %65 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 30 %63 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- A jumper for the evenings
- Rain jacket or umbrella
San Jose, California in January: quick answers
Is San Jose, California hot in January?
No. In January, San Jose, California is cool: daytime highs average 15 °C and nights drop to about 6 °C.
Does it rain much in San Jose, California in January?
Rain is frequent, with about 9 rainy days and 135 mm in total.
San Jose, California month by month
The whole year in San Jose, CaliforniaAll destinations: USAWhere to go in January
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences