Barnstable Harbor - Great Thatch Island Weather Forecast

    • 60
    • 77

    Increasing Clouds

    • 69
    • 75

    Mostly Cloudy

    • 66
    • 81

    Slight Chance Rain Showers

    • 52
    • 73

    Mostly Sunny

    • 55
    • 70

    Partly Sunny

    • 62
    • 72

    Partly Sunny

Today 8 Sep Barnstable

Mostly sunny. Highs in the mid 70s. Northwest Winds around 10 Mph, becoming north. Gusts up to 20 Mph.

Tonight 8 Sep Barnstable

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 60. Southeast Winds around 5 Mph.

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Barnstable Harbor - Great Thatch Island Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (3.7 miles)

  • Lowest 6 September, 2026

    53.1 °F

  • Average September

    66.4 °F

  • Highest 4 September, 2026

    79 °F

Climate (2021–2026)

Hyannis, Barnstable Municipal-Boardman Airport (3.7 miles)

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  • Average Low 2021–2026

    44.8 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    59.3 °F
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