Castle Island Weather Forecast

    • 58
    • 74

    Slight Chance Rain Showers

    • 61
    • 72

    Chance Rain Showers

    • 62
    • 76

    Chance Rain Showers

    • 54
    • 81

    Mostly Sunny

    • 51
    • 68

    Mostly Sunny

    • 56
    • 69

    Partly Sunny

Today 16 Sep Newport

Mostly sunny. Patchy fog in the morning. Highs in the lower 70s. Northeast Winds 10 to 15 Mph.

Tonight 16 Sep Newport

Mostly cloudy. Lows in the upper 50s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

September Temperature

N. Kingston / Quonset (7.5 miles)

  • Lowest 4 September, 2025

    53.6 °F
  • Average September

    65.1 °F
  • Highest 6 September, 2025

    78.8 °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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