In December, Onomichi typically sees daytime highs of 10.8°C and overnight lows around 3.2°C. Compared to the annual average high of 19.2°C, December runs -8.4°C.
December in Onomichi averages a daytime high of 10.8°C and an overnight low of 3.2°C.
December runs -8.4°C compared to Onomichi's annual average high of 19.2°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 10.8°C and cooler evenings around 3.2°C.