Onset Island Weather Forecast

    • 60
    • 75

    Becoming Sunny

    • 66
    • 76

    Mostly Sunny

    • 69
    • 77

    Chance Rain Showers

    • 67
    • 77

    Chance Rain Showers

    • 64
    • 75

    Partly Sunny

    • 66
    • 76

    Partly Sunny

Today 25 Aug Southern Plymouth

Sunny. Highs in the upper 70s. West Winds 5 to 10 Mph. Gusts up to 20 Mph this afternoon.

Tonight 25 Aug Southern Plymouth

Mostly clear. Lows in the upper 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Onset Island Temperature Statistics

August Temperature

Otis Air National Guard Base (8.7 miles)

  • Lowest 16 August, 2026

    55.4 °F

  • Average August

    73.1 °F

  • Highest 7 August, 2026

    89.6 °F

Climate (2021–2026)

Otis Air National Guard Base (8.7 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    59.1 °F
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