In September, Bloomington typically sees daytime highs of 26.6°C and overnight lows around 12.9°C. Compared to the annual average high of 17.8°C, September runs +8.8°C.
September in Bloomington averages a daytime high of 26.6°C and an overnight low of 12.9°C.
September runs +8.8°C compared to Bloomington's annual average high of 17.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.6°C and cooler evenings around 12.9°C.