In September, Chilliwack typically sees daytime highs of 19.4°C and overnight lows around 8.9°C. Compared to the annual average high of 12.8°C, September runs +6.6°C.
September in Chilliwack averages a daytime high of 19.4°C and an overnight low of 8.9°C.
September runs +6.6°C compared to Chilliwack's annual average high of 12.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.4°C and cooler evenings around 8.9°C.