Harwich Port Weather Forecast

    • 58
    • 70

    Increasing Clouds

    • 60
    • 71

    Chance Rain Showers

    • 61
    • 73

    Chance Rain Showers

    • 54
    • 74

    Mostly Sunny

    • 54
    • 66

    Mostly Sunny

    • 56
    • 68

    Partly Sunny

Today 16 Sep Barnstable

Mostly sunny. Highs around 70. Northeast Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon.

Tonight 16 Sep Barnstable

Mostly cloudy. Patchy fog after midnight. Lows in the upper 50s. East Winds 5 to 10 Mph.

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Harwich Port Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (4.3 miles)

  • Lowest 13 September, 2025

    46.9 °F

  • Average September

    64.6 °F

  • Highest 6 September, 2025

    79 °F

Climate (2020–Present)

Chatham, Chatham Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    54 °F

  • Average High 2020–2025

    60.1 °F
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