Lieutenant Island Weather Forecast

    • 49
    • 57

    Chance Rain Showers

    • 52
    • 63

    Chance Rain Showers

    • 50
    • 60

    Chance Rain Showers

    • 53
    • 61

    Slight Chance Rain Showers

    • 54
    • 65

    Chance Rain Showers

    • 59
    • 71

    Partly Sunny

    • 61
    • 76

    Partly Sunny

Today 30 May Barnstable

Showers, windy with Highs in the lower 60s. Temperature falling into the mid 50s late. Northeast Winds 20 to 30 Mph with Gusts up to 45 Mph. Chance of rain near 100 percent.

Tonight 30 May Barnstable

Mostly cloudy with Showers likely this Evening, then partly cloudy after midnight. Breezy. Near steady temperature around 50. Northeast Winds 20 to 25 Mph with Gusts up to 45 Mph, becoming north 10 to 15 Mph with Gusts up to 25 Mph after midnight. Chance of rain 70 percent.

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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

    55.5 °F

  • Highest 20 May, 2026

    72 °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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