Lieutenant Island Weather Forecast

    • 66
    • 76

    Decreasing Clouds

    • 66
    • 70

    Slight Chance Rain Showers

    • 65
    • 70

    Rain Showers Likely

    • 66
    • 74

    Chance Rain Showers

    • 65
    • 76

    Chance Rain Showers

    • 63
    • 73

    Slight Chance Rain Showers

Today 30 Aug Barnstable

Partly sunny. Highs in the upper 70s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 30 Aug Barnstable

Mostly cloudy with a 40 percent chance of Showers. Humid with Lows in the mid 60s. West Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lieutenant Island Temperature Statistics

August Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 16 August, 2026

    59 °F

  • Average August

    72.8 °F

  • Highest 11 August, 2026

    84.9 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    59.7 °F
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