In September, Pleasanton typically sees daytime highs of 27.5°C and overnight lows around 13.6°C. Compared to the annual average high of 20.7°C, September runs +6.8°C.
September in Pleasanton averages a daytime high of 27.5°C and an overnight low of 13.6°C.
September runs +6.8°C compared to Pleasanton's annual average high of 20.7°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 27.5°C and cooler evenings around 13.6°C.