Lieutenant Island Weather Forecast

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    Rain Showers

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    Chance Rain Showers

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    Mostly Cloudy

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    Mostly Cloudy

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    Chance Rain Showers

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    Chance Rain Showers

Today 20 Sep Barnstable

Mostly cloudy. Showers likely this afternoon. Patchy fog this afternoon. Highs in the mid 60s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 20 Sep Barnstable

Showers likely. Patchy fog. Lows in the mid 50s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Real-Time

Lieutenant Island Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 15 September, 2026

    51.1 °F

  • Average September

    66.2 °F

  • Highest 10 September, 2026

    80.1 °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

    53.6 °F

  • Average High 2021–2026

    59.7 °F
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