Block Island Weather Forecast

    • 64
    • 72

    Partly Sunny

    • 60
    • 73

    Mostly Sunny

    • 60
    • 71

    Partly Sunny

    • 62
    • 71

    Chance Rain Showers

    • 63
    • 72

    Chance Rain Showers

    • 58
    • 75

    Mostly Sunny

Today 14 Sep Block Island

Mostly sunny. Highs around 70. Southwest Winds 5 to 10 Mph.

Tonight 14 Sep Block Island

Partly cloudy in the Evening, then clearing. Patchy fog after midnight. Lows in the mid 60s. Southwest Winds 5 to 10 Mph, becoming west after midnight.

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Block Island Temperature Statistics

September Temperature

Block Island State Airport (0 miles)

  • Lowest 3 September, 2025

    55.9 °F

  • Average September

    64.9 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

Block Island State Airport (0 miles)

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  • Average Low 2020–2025

    47.1 °F

  • Average 2020–2025

    52.4 °F

  • Average High 2020–2025

    57.8 °F
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