Castle Island Weather Forecast

    • 64
    • 76

    Increasing Clouds

    • 69
    • 80

    Mostly Sunny

    • 62
    • 81

    Rain Showers Likely

    • 58
    • 74

    Chance Rain Showers

    • 54
    • 74

    Partly Sunny

    • 54
    • 72

    Partly Sunny

Today 4 Sep Newport

Sunny. Patchy fog this morning. Highs in the lower 70s. South Winds 5 to 10 Mph.

Tonight 4 Sep Newport

Partly cloudy in the Evening, then becoming mostly cloudy. Patchy fog. Not as cool. Near steady temperature in the mid 60s. South Winds 5 to 10 Mph. Gusts up to 20 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

September Temperature

N. Kingston / Quonset (7.5 miles)

  • Lowest 1 September, 2025

    57.2 °F

  • Average September

    65.9 °F

  • Highest 1 September, 2025

    73.4 °F

Climate (2020–Present)

N. Kingston / Quonset (7.5 miles)

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  • Average Low 2020–2025

    50.7 °F

  • Average 2020–2025

    56.3 °F

  • Average High 2020–2025

    61.2 °F
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