Watertown Weather Forecast

    • 66
    • 80

    Areas Fog

    • 63
    • 83

    Partly Sunny

    • 57
    • 75

    Chance Rain Showers

    • 56
    • 72

    Mostly Sunny

    • 59
    • 78

    Mostly Sunny

    • 59
    • 79

    Partly Sunny

    • 65
    • 77

    Chance Rain Showers

Today 3 Sep Southeast Middlesex

Partly sunny with a chance of Showers and Thunderstorms. Near steady temperature in the upper 70s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 3 Sep Southeast Middlesex

Partly cloudy with a chance of Showers and Thunderstorms this Evening, then mostly cloudy after midnight. Patchy fog after midnight. Lows in the mid 60s. East Winds around 5 Mph, becoming northwest after midnight. Chance of rain 30 percent.

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Watertown Temperature Statistics

September Temperature

Laurence G Hanscom Field Airport (8.7 miles)

  • Lowest 1 September, 2026

    61 °F

  • Average September

    64.8 °F

  • Highest 1 September, 2026

    69.1 °F

Climate (2021–2026)

Laurence G Hanscom Field Airport (8.7 miles)

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  • Average Low 2021–2026

    41.2 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    61.7 °F
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