San Jose (CA)
January
Weather in San Jose, California for January 2026
Your guide to San Jose weather in January - trends and predictions
Beach Hazards Statement - See hour by hour.
So far, January 2026 in San Jose is slightly warmer than the historical average by 0.8 °F.
The forecast for the next days in San Jose predicts temperatures to be around 19 °F, close to the historical average.
In general, the average temperature in San Jose at the beginning of January is 13.6 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.3 °F by the end of January.
San Jose in January brings notable rainfall, with an average of 19 rainy days and a total precipitation of 152.5 mm.
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Temperatures
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12
Dry days
19
Rainy days
0
Snow days
14°/6°
Temperatures
12 km/h
Avg max wind
73 %
Avg humidity
San Jose Weather January
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Temperatures trend during January in San Jose
See the weather trend as well as the moving average line
January weather in San Jose day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Cloudy | 14° /7° | 1.4 mm | 3 | |
| Jan. 2 |  Heavy rain at times | 14° /7° | 2.7 mm | 3 | |
| Jan. 3 |  Patchy rain possible | 13° /8° | 11.1 mm | 2 | |
| Jan. 4 |  Moderate or heavy rain shower | 13° /7° | 27.2 mm | 3 | |
| Jan. 5 | Moderate or heavy rain shower | 14° /6° | 6 mm | 3 | |
| Jan. 6 | Light rain shower | 14° /5° | 3.2 mm | 3 | |
| Jan. 7 |  Sunny | 13° /6° | 4.4 mm | 3 | |
| Jan. 8 |  Partly cloudy | 13° /5° | 5 mm | 3 | |
| Jan. 9 | Sunny | 15° /5° | 10.5 mm | 3 | |
| Jan. 10 | Moderate or heavy rain shower | 14° /5° | 8.5 mm | 3 | |
| Jan. 11 | Moderate or heavy rain shower | 14° /5° | 7 mm | 3 | |
| Jan. 12 | Sunny | 14° /4° | 0 mm | 4 | |
| Jan. 13 | Moderate or heavy rain shower | 15° /6° | 7.7 mm | 3 | |
| Jan. 14 | Sunny | 16° /7° | 10.5 mm | 3 | |
| Jan. 15 | Sunny | 17° /7° | 4.6 mm | 4 | |
| Jan. 16 | Patchy rain possible | 16° /7° | 4.6 mm | 3 | |
| Jan. 17 |  Overcast | 15° /6° | 0.1 mm | 3 | |
| Jan. 18 | Overcast | 13° /5° | 0.1 mm | 4 | |
| Jan. 19 |  Mist | 14° /5° | 3.2 mm | 3 | |
| Jan. 20 | Sunny | 15° /5° | 1.2 mm | 3 | |
| Jan. 21 | Sunny | 15° /6° | 0 mm | 3 | |
| Jan. 22 | Sunny | 15° /6° | 7.1 mm | 3 | |
| Jan. 23 | Sunny | 15° /6° | 0 mm | 4 | |
| Jan. 24 | Sunny | 15° /5° | 0.7 mm | 3 | |
| Jan. 25 | Mist | 15° /4° | 0 mm | 3 | |
| Jan. 26 | Sunny | 16° /5° | 0.4 mm | 3 | |
| Jan. 27 | Sunny | 20° /5° | 0 mm | 0.6 | |
| Jan. 28 | Cloudy | 16° /7° | 0 mm | 0.6 | |
| Jan. 29 | Partly cloudy | 20° /3° | 0 mm | 0.6 | |
| Jan. 30 | Partly cloudy | 20° /9° | 0 mm | 0 | |
| Jan. 31 | Sunny | 21° /9° | 0 mm | 4 | |
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Important Notice
Our weather forecast for San Jose in January is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Jose forecast closer to your planned date for the most up-to-date weather information.
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San Jose in January - FAQ
What are the expected maximum and minimum temperatures in San Jose during January?
During January, expect a variety of temperatures with highs around 14° and lows near 6°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Jose during January?
Significant rainfall exceeding 152.5 mm is expected in San Jose during January, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San Jose during January?
The average wind speed in San Jose during January is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in San Jose
Explore the daily rainfall trends and prepare for San Joses January weather 💧
Typically, San Jose has 19 rainy days in January with a total of 152.5 mm of rainfall.
UV exposure in San Jose during January
Stay informed about UV levels for safe outdoor activities throughout the month of January ☀️
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