In September, Sankt Gallen typically sees daytime highs of 16.8°C and overnight lows around 8.9°C. Compared to the annual average high of 10.8°C, September runs +6.0°C.
September in Sankt Gallen averages a daytime high of 16.8°C and an overnight low of 8.9°C.
September runs +6.0°C compared to Sankt Gallen's annual average high of 10.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 16.8°C and cooler evenings around 8.9°C.