In September, Rochester typically sees daytime highs of 21.8°C and overnight lows around 9.1°C. Compared to the annual average high of 12.5°C, September runs +9.3°C.
September in Rochester averages a daytime high of 21.8°C and an overnight low of 9.1°C.
September runs +9.3°C compared to Rochester's annual average high of 12.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 21.8°C and cooler evenings around 9.1°C.