Lieutenant Island Weather Forecast

    • 66
    • 74

    Increasing Clouds

    • 69
    • 77

    Mostly Sunny

    • 75
    • 82

    Mostly Sunny

    • 71
    • 87

    Partly Sunny

    • 71
    • 83

    Partly Sunny

    • 70
    • 83

    Partly Sunny

Today 12 Jul Barnstable

Sunny. Highs around 80. Northeast Winds 5 to 10 Mph.

Tonight 12 Jul Barnstable

Mostly clear. Lows in the upper 50s. Southeast Winds around 5 Mph, becoming southwest after midnight.

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Lieutenant Island Temperature Statistics

July Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 6 July, 2026

    61 °F

  • Average July

    72.7 °F

  • Highest 3 July, 2026

    91 °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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