In September, Onomichi typically sees daytime highs of 27.1°C and overnight lows around 20.0°C. Compared to the annual average high of 19.2°C, September runs +7.9°C.
September in Onomichi averages a daytime high of 27.1°C and an overnight low of 20.0°C.
September runs +7.9°C compared to Onomichi's annual average high of 19.2°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 27.1°C and cooler evenings around 20.0°C.