Lieutenant Island Weather Forecast

    • 70
    • 80

    Mostly Sunny

    • 70
    • 79

    Partly Sunny

    • 69
    • 79

    Slight Chance Rain Showers

    • 69
    • 80

    Slight Chance Rain Showers

    • 68
    • 80

    Slight Chance Rain Showers

    • 65
    • 79

    Partly Sunny

Today 9 Aug Barnstable

Sunny with Highs in the mid 80s. Southwest Winds 10 to 15 Mph. Gusts up to 25 Mph in the afternoon.

Tonight 9 Aug Barnstable

Mostly clear. Near steady temperature in the mid 70s. Southwest Winds 5 to 10 Mph.

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Lieutenant Island Temperature Statistics

August Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 5 August, 2026

    61 °F

  • Average August

    73.6 °F

  • Highest 5 August, 2026

    82 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    59.8 °F
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