In September, Chester typically sees daytime highs of 17.2°C and overnight lows around 9.2°C. Compared to the annual average high of 12.9°C, September runs +4.3°C.
September in Chester averages a daytime high of 17.2°C and an overnight low of 9.2°C.
September runs +4.3°C compared to Chester's annual average high of 12.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 17.2°C and cooler evenings around 9.2°C.