Lieutenant Island Weather Forecast

    • 65
    • 70

    Rain Showers

    • 60
    • 68

    Chance Rain Showers

    • 59
    • 64

    Mostly Sunny

    • 62
    • 70

    Mostly Sunny

    • 63
    • 72

    Chance Rain Showers

    • 60
    • 71

    Slight Chance Rain Showers

Today 13 Sep Barnstable

Showers with a slight chance of Thunderstorms this Morning, then Showers with a chance of Thunderstorms this afternoon. Patchy fog. Some Thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. Highs in the lower 70s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain near 100 percent.

Tonight 13 Sep Barnstable

Mostly cloudy with a 40 percent chance of Showers. Patchy fog. Humid with Lows in the lower 60s. West Winds around 5 Mph.

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Lieutenant Island Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 6 September, 2026

    55 °F

  • Average September

    67 °F

  • Highest 10 September, 2026

    80.1 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    53.6 °F

  • Average High 2021–2026

    59.7 °F
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