In August, Niihama typically sees daytime highs of 28.6°C and overnight lows around 21.8°C. Compared to the annual average high of 17.0°C, August runs +11.6°C.
August in Niihama averages a daytime high of 28.6°C and an overnight low of 21.8°C.
August runs +11.6°C compared to Niihama's annual average high of 17.0°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 28.6°C and cooler evenings around 21.8°C.