In December, Iwakuni typically sees daytime highs of 10.7°C and overnight lows around 2.8°C. Compared to the annual average high of 18.6°C, December runs -7.9°C.
December in Iwakuni averages a daytime high of 10.7°C and an overnight low of 2.8°C.
December runs -7.9°C compared to Iwakuni's annual average high of 18.6°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 10.7°C and cooler evenings around 2.8°C.