In September, Oyama typically sees daytime highs of 26.1°C and overnight lows around 18.1°C. Compared to the annual average high of 19.1°C, September runs +7.0°C.
September in Oyama averages a daytime high of 26.1°C and an overnight low of 18.1°C.
September runs +7.0°C compared to Oyama's annual average high of 19.1°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.1°C and cooler evenings around 18.1°C.