Block Island Sound Weather Forecast

    • 59
    • 68

    Mostly Cloudy

    • 56
    • 64

    Chance Rain

    • 57
    • 65

    Breezy

    • 57
    • 64

    Chance Rain Showers

    • 58
    • 63

    Chance Rain Showers

    • 59
    • 65

    Chance Rain Showers

Today 21 Sep Northeast Suffolk

Mostly sunny. Highs in the upper 60s.

Tonight 21 Sep Northeast Suffolk

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 50s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Block Island Sound Temperature Statistics

September Temperature

Westerly, Westerly State Airport (7.5 miles)

  • Lowest 15 September, 2026

    48 °F

  • Average September

    67.1 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

Westerly, Westerly State Airport (7.5 miles)

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  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    60.4 °F
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