In September, Saint Joseph typically sees daytime highs of 26.1°C and overnight lows around 12.9°C. Compared to the annual average high of 17.6°C, September runs +8.5°C.
September in Saint Joseph averages a daytime high of 26.1°C and an overnight low of 12.9°C.
September runs +8.5°C compared to Saint Joseph's annual average high of 17.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.1°C and cooler evenings around 12.9°C.