Lieutenant Island Weather Forecast

    • 56
    • 66

    Becoming Sunny

    • 65
    • 70

    Mostly Sunny

    • 64
    • 70

    Partly Sunny

    • 67
    • 75

    Mostly Cloudy

    • 62
    • 77

    Partly Sunny

    • 61
    • 70

    Mostly Sunny

Today 6 Sep Barnstable

Mostly sunny. Highs in the upper 60s. North Winds 10 to 15 Mph.

Tonight 6 Sep Barnstable

Mostly clear. Lows in the mid 50s. Northwest Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lieutenant Island Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 3 September, 2026

    62.1 °F

  • Average September

    66.5 °F

  • Highest 3 September, 2026

    75 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (14.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    59.7 °F
Get WillyWeather+ to remove ads