Block Island Weather Forecast

    • 61
    • 68

    Rain Showers

    • 58
    • 66

    Chance Rain Showers

    • 58
    • 63

    Breezy

    • 58
    • 64

    Breezy

    • 58
    • 64

    Chance Rain Showers

    • 57
    • 64

    Chance Rain Showers

Today 20 Sep Block Island

Cloudy. A slight chance of Showers in the Morning, then Showers likely in the afternoon. Patchy fog in the afternoon. Highs in the upper 60s. Southeast Winds 10 to 15 Mph. Chance of rain 70 percent.

Tonight 20 Sep Block Island

Showers. Patchy fog. Lows in the lower 60s. Southeast Winds 10 to 15 Mph, becoming northeast 5 to 10 Mph after midnight. Gusts up to 25 Mph. Chance of rain near 100 percent.

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Block Island Temperature Statistics

September Temperature

Block Island State Airport (0.6 miles)

  • Lowest 16 September, 2026

    55 °F

  • Average September

    67.8 °F

  • Highest 4 September, 2026

    81 °F

Climate (2021–2026)

Block Island State Airport (0.6 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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