Great Marshes Weather Forecast

    • 58
    • 67

    Rain Showers

    • 57
    • 66

    Rain Showers Likely

    • 55
    • 61

    Mostly Cloudy

    • 58
    • 64

    Mostly Cloudy

    • 61
    • 71

    Partly Sunny

    • 57
    • 70

    Partly Sunny

    • 54
    • 63

    Partly Sunny

Today 27 Sep Barnstable

Partly sunny with a 30 percent chance of Showers. Highs in the lower 60s.

Tonight 27 Sep Barnstable

Showers with a chance of Thunderstorms. Patchy fog. Some Thunderstorms may produce heavy rainfall after midnight. Near steady temperature around 60. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 80 percent.

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Great Marshes Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (5.6 miles)

  • Lowest 16 September, 2026

    46.9 °F

  • Average September

    64.7 °F

  • Highest 10 September, 2026

    82 °F

Climate (2021–2026)

Hyannis, Barnstable Municipal-Boardman Airport (5.6 miles)

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  • Average Low 2021–2026

    44.7 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    59.2 °F
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