In September, Sleman typically sees daytime highs of 30.0°C and overnight lows around 20.1°C. Compared to the annual average high of 29.9°C, September runs +0.0°C.
September in Sleman averages a daytime high of 30.0°C and an overnight low of 20.1°C.
September runs +0.0°C compared to Sleman's annual average high of 29.9°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 30.0°C and cooler evenings around 20.1°C.