In September, Plainfield typically sees daytime highs of 24.8°C and overnight lows around 12.6°C. Compared to the annual average high of 16.8°C, September runs +8.0°C.
September in Plainfield averages a daytime high of 24.8°C and an overnight low of 12.6°C.
September runs +8.0°C compared to Plainfield's annual average high of 16.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 24.8°C and cooler evenings around 12.6°C.