Swan River Mouth Weather Forecast

    • 63
    • 70

    Decreasing Clouds

    • 56
    • 71

    Mostly Sunny

    • 56
    • 64

    Mostly Sunny

    • 59
    • 64

    Partly Sunny

    • 62
    • 67

    Partly Sunny

    • 63
    • 70

    Slight Chance Rain Showers

Today 18 Sep Barnstable

Mostly cloudy with isolated Showers with patchy drizzle this Morning, then partly sunny with patchy drizzle this afternoon. Patchy fog. Highs in the mid 70s. North Winds around 5 Mph. Chance of rain 20 percent.

Tonight 18 Sep Barnstable

Partly cloudy in the Evening, then becoming mostly clear. Patchy fog. Lows in the lower 60s. West Winds 5 to 10 Mph.

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Swan River Mouth Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (5.6 miles)

  • Lowest 13 September, 2025

    44.1 °F

  • Average September

    63.9 °F

  • Highest 6 September, 2025

    77 °F

Climate (2020–Present)

Hyannis, Barnstable Municipal-Boardman Airport (5.6 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    59.9 °F
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