In September, Mountain View typically sees daytime highs of 24.9°C and overnight lows around 12.1°C. Compared to the annual average high of 19.2°C, September runs +5.7°C.
September in Mountain View averages a daytime high of 24.9°C and an overnight low of 12.1°C.
September runs +5.7°C compared to Mountain View's annual average high of 19.2°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 24.9°C and cooler evenings around 12.1°C.