Waltham Weather Forecast

    • 69
    • 88

    Thunderstorms Likely

    • 65
    • 81

    Chance Thunderstorms

    • 67
    • 83

    Partly Sunny

    • 69
    • 84

    Mostly Sunny

    • 71
    • 88

    Chance Thunderstorms

    • 69
    • 88

    Chance Thunderstorms

Today 23 Jul Mower

Mostly cloudy after Midnight, then clearing. Numerous Showers and scattered Thunderstorms after midnight. Humid with Highs in the upper 80s. South Winds 10 to 20 Mph. Chance of rain 70 percent. Heat index Values up to 100 this afternoon.

Tonight 23 Jul Mower

Partly cloudy in the Evening, then becoming mostly cloudy. A chance of Thunderstorms. A chance of Showers in the Evening, then Showers likely after midnight. Humid with Lows in the upper 60s. Southwest Winds 10 to 15 Mph. Chance of rain 70 percent. Heat index Values up to 100 early in the evening.

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Waltham Temperature Statistics

July Temperature

Austin Municipal (10.6 miles)

  • Lowest 17 July, 2025

    53.6 °F

  • Average July

    73 °F

  • Highest 3 July, 2025

    89.6 °F

Climate (2020–Present)

Austin Municipal (10.6 miles)

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  • Average Low 2020–2025

    38.4 °F

  • Average 2020–2025

    47.8 °F

  • Average High 2020–2025

    57.2 °F
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