Will I be cold?
Will I be cold in San Jose in July?
Verdict
No — No, comfortable.
Lows stay near 62°F — you won't be reaching for the puffer.
Day vs. night
Day
89°F
Hot
Prioritize shade, hydration, and a brim.
Night
62°F
Comfortable
Comfortable outside without an extra layer.
Why
San Jose in July averages highs of 89°F, lows of 62°F, 0 rainy days.
You can pack for the daytime temps and not worry about the evening dip.
The day-to-night temperature swing is 27°F, which is the real story here — the average number hides how different midday and midnight feel.