Lieutenant Island Weather Forecast

    • 52
    • 70

    Mostly Sunny

    • 55
    • 63

    Partly Sunny

    • 58
    • 68

    Partly Sunny

    • 51
    • 68

    Chance Rain Showers

    • 49
    • 62

    Partly Sunny

    • 49
    • 60

    Mostly Cloudy

    • 50
    • 61

    Slight Chance Rain Showers

Today 17 May Barnstable

Sunny. Near steady temperature in the lower 70s. Southwest Winds 10 to 15 Mph.

Tonight 17 May Barnstable

Mostly clear. Lows in the mid 50s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming northeast after midnight.

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Lieutenant Island Temperature Statistics

May Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 8 May, 2026

    42.1 °F

  • Average May

    52.4 °F

  • Highest 6 May, 2026

    63 °F

Climate (2021–Present)

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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