In September, Saint-Etienne typically sees daytime highs of 19.5°C and overnight lows around 9.1°C. Compared to the annual average high of 13.3°C, September runs +6.1°C.
September in Saint-Etienne averages a daytime high of 19.5°C and an overnight low of 9.1°C.
September runs +6.1°C compared to Saint-Etienne's annual average high of 13.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.5°C and cooler evenings around 9.1°C.