Averages from 2021–2025 (155 days of record).
Expect January days in San Jose, California to top out around 59°F and cool to about 43°F overnight, with roughly 7 days of measurable rain across the month. In recent years January has ranged from 33°F to 74°F.
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Current San Jose, California forecast → · Historical data by Open-Meteo (ERA5).
