In September, Trier typically sees daytime highs of 18.5°C and overnight lows around 8.8°C. Compared to the annual average high of 12.7°C, September runs +5.9°C.
September in Trier averages a daytime high of 18.5°C and an overnight low of 8.8°C.
September runs +5.9°C compared to Trier's annual average high of 12.7°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.5°C and cooler evenings around 8.8°C.