Groton Weather Forecast

    • 48
    • 75

    Mostly Sunny

    • 53
    • 76

    Partly Sunny

    • 54
    • 77

    Slight Chance Rain Showers

    • 53
    • 77

    Partly Sunny

    • 57
    • 80

    Mostly Sunny

    • 62
    • 83

    Chance Rain Showers

Today 18 Aug Northwest Middlesex County

Sunny. Much cooler with Highs in the mid 70s. North Winds 5 to 10 Mph. Gusts up to 20 Mph this morning.

Tonight 18 Aug Northwest Middlesex County

Mostly clear. Lows in the upper 40s. Southeast Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Real-Time

Groton Temperature Statistics

August Temperature

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

  • Lowest 2 August, 2025

    49.6 °F

  • Average August

    72.8 °F

  • Highest 11 August, 2025

    93.7 °F

Climate (2020–Present)

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    41.8 °F

  • Average 2020–2025

    51.9 °F

  • Average High 2020–2025

    61.8 °F
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