Groton Weather Forecast

    • 48
    • 76

    Sunny

    • 58
    • 77

    Rain Showers Likely

    • 55
    • 75

    Rain Showers Likely

    • 46
    • 73

    Mostly Sunny

    • 53
    • 71

    Partly Sunny

    • 57
    • 80

    Chance Rain Showers

Today 11 Sep Northwest Middlesex County

Sunny. Near steady temperature in the mid 70s. Northwest Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 11 Sep Northwest Middlesex County

Clear. Lows in the upper 40s. Northwest Winds 5 to 10 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Groton Temperature Statistics

September Temperature

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

  • Lowest 6 September, 2026

    52 °F

  • Average September

    64.8 °F

  • Highest 7 September, 2026

    79 °F

Climate (2021–2026)

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    41.3 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    61.5 °F
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