In September, Santa Clara typically sees daytime highs of 31.6°C and overnight lows around 21.0°C. Compared to the annual average high of 29.8°C, September runs +1.9°C.
September in Santa Clara averages a daytime high of 31.6°C and an overnight low of 21.0°C.
September runs +1.9°C compared to Santa Clara's annual average high of 29.8°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 31.6°C and cooler evenings around 21.0°C.