Groton Weather Forecast

    • 64
    • 82

    Rain Showers

    • 58
    • 84

    Rain Showers Likely

    • 56
    • 80

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

    • 61
    • 84

    Mostly Sunny

    • 64
    • 87

    Partly Sunny

Today 21 Jul Northwest Middlesex County

Mostly cloudy. A chance of Showers with isolated Thunderstorms in the afternoon. Highs in the lower 80s. South Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

Tonight 21 Jul Northwest Middlesex County

Showers with a chance of Thunderstorms. Humid with Lows in the mid 60s. South Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain near 100 percent.

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Groton Temperature Statistics

July Temperature

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

  • Lowest 12 July, 2026

    55.9 °F

  • Average July

    75.8 °F

  • Highest 2 July, 2026

    97 °F

Climate (2021–2026)

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    41.4 °F

  • Average 2021–2026

    51.6 °F

  • Average High 2021–2026

    61.5 °F
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