In September, Union City typically sees daytime highs of 24.4°C and overnight lows around 12.9°C. Compared to the annual average high of 16.4°C, September runs +8.0°C.
September in Union City averages a daytime high of 24.4°C and an overnight low of 12.9°C.
September runs +8.0°C compared to Union City's annual average high of 16.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 24.4°C and cooler evenings around 12.9°C.