San Jose, California weather in August

Averages from 2021–2025 (155 days of record).

Average high: 85°F
Average low: 59°F
Rainy days: ~0 per month
Total precipitation: 0.0 in
Warmest recorded: 102°F
Coldest recorded: 54°F

Expect August days in San Jose, California to top out around 85°F and cool to about 59°F overnight, with roughly 0 days of measurable rain across the month. In recent years August has ranged from 54°F to 102°F.

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Current San Jose, California forecast → · Historical data by Open-Meteo (ERA5).