Lieutenant Island Weather Forecast

    • 63
    • 67

    Increasing Clouds

    • 65
    • 71

    Partly Sunny

    • 67
    • 72

    Rain Showers Likely

    • 66
    • 75

    Rain Showers Likely

    • 67
    • 76

    Slight Chance Rain Showers

    • 67
    • 78

    Partly Sunny

Today 26 Jul Barnstable

Sunny. Highs in the mid 70s. Northeast Winds 5 to 10 Mph.

Tonight 26 Jul Barnstable

Mostly clear. Near steady temperature around 60. Northeast Winds around 5 Mph.

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Lieutenant Island Temperature Statistics

July Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 20 July, 2026

    57.9 °F

  • Average July

    71.8 °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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