Monthly climate guide
San Jose weather in January
With highs near 15°C (58°F) and lows around 5°C (40°F), January feels cool in San Jose. Rainfall averages about 92 mm (wet) and the sky is a mix of sun and cloud. Daytime highs are about the same as December and about the same as February.
What stands out in January
- It's wetter than a typical month in San Jose — roughly 119% more rain than average.
- In San Jose, January is mid-winter.
- It's one of the greyest months, with cloud cover near 54%.
- January is among San Jose's three coolest months.
Avg high
15°C
58°F
Avg low
5°C
40°F
Rainfall
92 mm
wet
Humidity
83%
relative
Sky
54%
cloud · a mix of sun and cloud
San Jose weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 15°C / 58°F | 5°C / 40°F | 92 mm | 83% | 54% |
| February | 16°C / 60°F | 5°C / 41°F | 86 mm | 81% | 44% |
| March | 17°C / 62°F | 6°C / 43°F | 97 mm | 82% | 51% |
| April | 19°C / 67°F | 7°C / 45°F | 38 mm | 78% | 39% |
| May | 22°C / 72°F | 9°C / 48°F | 14 mm | 73% | 31% |
| June | 27°C / 80°F | 11°C / 51°F | 6 mm | 65% | 16% |
| July | 30°C / 85°F | 12°C / 54°F | 0 mm | 62% | 12% |
| August | 30°C / 86°F | 13°C / 55°F | 0 mm | 63% | 14% |
| September | 30°C / 85°F | 13°C / 55°F | 3 mm | 61% | 16% |
| October | 26°C / 79°F | 11°C / 51°F | 21 mm | 60% | 23% |
| November | 19°C / 66°F | 7°C / 45°F | 57 mm | 71% | 39% |
| December | 14°C / 58°F | 4°C / 39°F | 90 mm | 79% | 46% |
What to pack for January
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is January a good time to visit San Jose?
Compare the months in the chart above to find your ideal window.
Best time to visit San Jose →Other United States cities in January
Cite or embed this data
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San Jose weather in January. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/san-jose-usa/january
<a href="https://weathercompare.eu/weather/usa/san-jose-usa/january">San Jose weather in January</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/san-jose-usa" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="San Jose weather in January"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/san-jose-usa/january">San Jose weather in January</a> – WeatherCompare</p>
San Jose in January: quick answers
Is January a good time to visit San Jose?
January is one of the wetter months in San Jose, with about 92 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is San Jose in January?
Average highs are about 15°C (58°F) and average lows about 5°C (40°F), based on 10 years of daily data.
Does it rain a lot in San Jose in January?
San Jose typically gets around 92 mm of rain in January — wet.
Figures are long-term averages for the area around San Jose (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.