In September, Yilan typically sees daytime highs of 19.8°C and overnight lows around 7.1°C. Compared to the annual average high of 8.6°C, September runs +11.2°C.
September in Yilan averages a daytime high of 19.8°C and an overnight low of 7.1°C.
September runs +11.2°C compared to Yilan's annual average high of 8.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.8°C and cooler evenings around 7.1°C.