In September, Rocklin typically sees daytime highs of 30.8°C and overnight lows around 13.3°C. Compared to the annual average high of 22.9°C, September runs +7.9°C.
September in Rocklin averages a daytime high of 30.8°C and an overnight low of 13.3°C.
September runs +7.9°C compared to Rocklin's annual average high of 22.9°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 30.8°C and cooler evenings around 13.3°C.