Thames River - Green Harbor Weather Forecast

    • 39
    • 54

    Partly Sunny

    • 41
    • 58

    Mostly Cloudy

    • 45
    • 53

    Rain Showers Likely

    • 32
    • 53

    Chance Rain Showers

    • 38
    • 44

    Chance Rain

    • 34
    • 47

    Mostly Cloudy

Today 9 Mar Southern New London

Patchy fog in the morning. Sunny. Highs in the upper 50s. Southwest Winds around 5 Mph.

Tonight 9 Mar Southern New London

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 30s. Southwest Winds around 5 Mph.

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Thames River - Green Harbor Temperature Statistics

March Temperature

Groton / New London, Groton / New London Airport (2.5 miles)

  • Lowest 3 March, 2026

    12 °F

  • Average March

    31.8 °F

  • Highest 4 March, 2026

    45 °F

Climate (2021–Present)

Groton / New London, Groton / New London Airport (2.5 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.8 °F
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