Lieutenant Island Weather Forecast

    • 58
    • 71

    Mostly Sunny

    • 53
    • 65

    Sunny

    • 58
    • 65

    Partly Sunny

    • 61
    • 69

    Partly Sunny

    • 61
    • 73

    Slight Chance Rain Showers

    • 59
    • 69

    Slight Chance Rain Showers

Today 19 Sep Barnstable

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming north this afternoon.

Tonight 19 Sep Barnstable

Partly cloudy in the Evening, then becoming mostly clear. Lows in the upper 50s. Northeast Winds 10 to 15 Mph.

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Lieutenant Island Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 13 September, 2025

    46.9 °F

  • Average September

    64.5 °F

  • Highest 6 September, 2025

    79 °F

Climate (2020–Present)

Chatham, Chatham Municipal Airport (14.3 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    54 °F

  • Average High 2020–2025

    60.1 °F
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