In September, Detroit typically sees daytime highs of 23.3°C and overnight lows around 11.6°C. Compared to the annual average high of 14.3°C, September runs +9.0°C.
September in Detroit averages a daytime high of 23.3°C and an overnight low of 11.6°C.
September runs +9.0°C compared to Detroit's annual average high of 14.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 23.3°C and cooler evenings around 11.6°C.