Harwich Port Weather Forecast

    • 50
    • 63

    Chance Rain Showers

    • 51
    • 61

    Partly Sunny

    • 52
    • 63

    Rain Showers Likely

    • 54
    • 65

    Rain Showers

    • 54
    • 67

    Chance Rain Showers

    • 56
    • 68

    Partly Sunny

Today 21 May Barnstable

Mostly cloudy. A chance of Showers, mainly this morning. Much cooler with Highs in the lower 60s. Northeast Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 30 percent.

Tonight 21 May Barnstable

Mostly cloudy. Lows in the upper 40s. Southeast Winds around 5 Mph, becoming northwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Harwich Port Temperature Statistics

May Temperature

Chatham, Chatham Municipal Airport (4.3 miles)

  • Lowest 8 May, 2026

    42.1 °F

  • Average May

    54.1 °F

  • Highest 17 May, 2026

    70 °F

Climate (2021–Present)

Chatham, Chatham Municipal Airport (4.3 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    59.8 °F
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