In August, Waltham typically sees daytime highs of 27.0°C and overnight lows around 15.4°C. Compared to the annual average high of 15.0°C, August runs +12.0°C.
August in Waltham averages a daytime high of 27.0°C and an overnight low of 15.4°C.
August runs +12.0°C compared to Waltham's annual average high of 15.0°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 27.0°C and cooler evenings around 15.4°C.