Onset Beach Weather Forecast

    • 50
    • 66

    Rain Showers Likely

    • 46
    • 58

    Becoming Sunny

    • 52
    • 65

    Partly Sunny

    • 53
    • 66

    Mostly Sunny

    • 58
    • 70

    Mostly Sunny

    • 61
    • 74

    Partly Sunny

    • 60
    • 74

    Partly Sunny

Today 31 May Southern Plymouth

Mostly cloudy with a 50 percent chance of Showers. Not as cool. Near steady temperature in the upper 60s. Southwest Winds 5 to 10 Mph.

Tonight 31 May Southern Plymouth

Mostly cloudy. Showers Likely, mainly this evening. Lows in the upper 40s. West Winds around 5 Mph. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Onset Beach Temperature Statistics

May Temperature

Otis Air National Guard Base (9.3 miles)

  • Lowest 3 May, 2026

    39.2 °F

  • Average May

    57.2 °F

  • Highest 20 May, 2026

    80.6 °F

Climate (2021–Present)

Otis Air National Guard Base (9.3 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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