San Jose weather in January
Long-run climate averages for San Jose, CA in January, plus what the forecast models say for the days ahead.
In January, San Jose averages 59°F by day and 45°F at night. It is the wettest month of the year here.
January in San Jose averages a daytime high of 59°F and an overnight low of 45°F, which reads as mild for this part of the world. It is among the three coldest months of the year here. It is also the wettest month, so build rain into any plan. Across the whole year San Jose sees roughly 28 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live San Jose forecast with every model compared and how much they currently agree.
San Jose weather by month
what to expect in San Jose through the yearHere is San Jose's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to San Jose by season.