In January, Niihama typically sees daytime highs of 5.7°C and overnight lows around -1.4°C. Compared to the annual average high of 17.0°C, January runs -11.3°C.
January in Niihama averages a daytime high of 5.7°C and an overnight low of -1.4°C.
January runs -11.3°C compared to Niihama's annual average high of 17.0°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 5.7°C and cooler evenings around -1.4°C.