In September, Pematangsiantar typically sees daytime highs of 30.3°C and overnight lows around 19.9°C. Compared to the annual average high of 30.4°C, September runs -0.1°C.
September in Pematangsiantar averages a daytime high of 30.3°C and an overnight low of 19.9°C.
September runs -0.1°C compared to Pematangsiantar's annual average high of 30.4°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 30.3°C and cooler evenings around 19.9°C.