Merchant Island Weather Forecast

    • 50
    • 58

    Chance Rain Showers

    • 48
    • 62

    Partly Sunny

    • 48
    • 58

    Partly Sunny

    • 48
    • 57

    Partly Sunny

    • 49
    • 58

    Chance Rain Showers

    • 49
    • 59

    Chance Rain Showers

Today 20 Sep Knox

Rain likely. Highs in the upper 50s. South Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

Tonight 20 Sep Knox

Cloudy. Rain likely in the Evening, then a chance of Showers after midnight. Patchy fog. Lows in the mid 40s. Light and variable Winds. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Merchant Island Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (22.4 miles)

  • Lowest 12 September, 2026

    44.1 °F

  • Average September

    61.5 °F

  • Highest 10 September, 2026

    84 °F

Climate (2021–2026)

Rockland, Knox County Regional Airport (22.4 miles)

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  • Average Low 2021–2026

    39.5 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    54.8 °F
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