Lieutenant Island Weather Forecast

    • 60
    • 72

    Increasing Clouds

    • 58
    • 71

    Mostly Sunny

    • 63
    • 73

    Partly Sunny

    • 60
    • 72

    Chance Rain Showers

    • 60
    • 68

    Slight Chance Thunderstorms

    • 61
    • 69

    Partly Sunny

Today 26 Aug Barnstable

Sunny. Highs in the mid 70s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 26 Aug Barnstable

Mostly clear. Near steady temperature in the mid 60s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lieutenant Island Temperature Statistics

August Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 19 August, 2025

    51.7 °F

  • Average August

    68.3 °F

  • Highest 12 August, 2025

    86.6 °F

Climate (2020–Present)

Chatham, Chatham Municipal Airport (14.3 miles)

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  • Average Low 2020–2025

    47.8 °F

  • Average 2020–2025

    54 °F

  • Average High 2020–2025

    60.1 °F
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