Great Island Weather Forecast

    • 63
    • 67

    Mostly Cloudy

    • 65
    • 68

    Rain Showers Likely

    • 65
    • 70

    Chance Rain Showers

    • 60
    • 71

    Mostly Sunny

    • 57
    • 63

    Mostly Sunny

    • 60
    • 64

    Partly Sunny

    • 64
    • 67

    Partly Sunny

Today 16 Sep Barnstable

Partly sunny. Near steady temperature in the upper 60s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 16 Sep Barnstable

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the upper 50s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Great Island Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (3.7 miles)

  • Lowest 13 September, 2025

    44.1 °F

  • Average September

    64.1 °F

  • Highest 6 September, 2025

    77 °F

Climate (2020–Present)

Hyannis, Barnstable Municipal-Boardman Airport (3.7 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    59.9 °F
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