In September, Blackburn typically sees daytime highs of 15.6°C and overnight lows around 8.9°C. Compared to the annual average high of 11.4°C, September runs +4.2°C.
September in Blackburn averages a daytime high of 15.6°C and an overnight low of 8.9°C.
September runs +4.2°C compared to Blackburn's annual average high of 11.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 15.6°C and cooler evenings around 8.9°C.