Onset Island Weather Forecast

    • 58
    • 77

    Decreasing Clouds

    • 67
    • 79

    Mostly Sunny

    • 64
    • 82

    Chance Thunderstorms

    • 50
    • 72

    Partly Sunny

    • 57
    • 75

    Partly Sunny

    • 61
    • 75

    Partly Sunny

Today 15 Aug Southern Plymouth

Mostly sunny. Highs around 80. Northeast Winds 10 to 15 Mph.

Tonight 15 Aug Southern Plymouth

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 50s. Northeast Winds 5 to 10 Mph, becoming north after midnight.

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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 9 August, 2025

    46.4 °F

  • Average August

    68 °F

  • Highest 11 August, 2025

    89.6 °F

Climate (2020–Present)

Otis Air National Guard Base (8.7 miles)

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  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    52.2 °F

  • Average High 2020–2025

    59.4 °F
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