Block Island Weather Forecast

    • 58
    • 67

    Slight Chance Rain

    • 55
    • 65

    Breezy

    • 57
    • 65

    Breezy

    • 57
    • 64

    Chance Rain Showers

    • 58
    • 63

    Rain Showers Likely

    • 59
    • 64

    Chance Rain Showers

Today 21 Sep Block Island

Mostly cloudy with a chance of rain this Morning, then partly sunny this afternoon. Patchy fog this morning. Highs in the upper 60s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 30 percent.

Tonight 21 Sep Block Island

Mostly cloudy. A slight chance of rain after midnight. Lows in the upper 50s. Northeast Winds 15 to 20 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Block Island Temperature Statistics

September Temperature

Block Island State Airport (0 miles)

  • Lowest 16 September, 2026

    55 °F

  • Average September

    67.6 °F

  • Highest 4 September, 2026

    81 °F

Climate (2021–2026)

Block Island State Airport (0 miles)

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  • Average Low 2021–2026

    46.7 °F

  • Average 2021–2026

    52.1 °F

  • Average High 2021–2026

    57.5 °F
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