Intracoastal Waterway - William Island Weather Forecast

    • 71
    • 86

    Rain Showers Likely

    • 71
    • 86

    Chance Rain Showers

    • 72
    • 87

    Partly Sunny

    • 70
    • 85

    Rain Showers Likely

    • 67
    • 83

    Chance Thunderstorms

    • 65
    • 82

    Slight Chance Thunderstorms

Today 19 Sep Coastal Horry

Mostly sunny. A chance of Showers and Thunderstorms in the afternoon. Highs in the mid 80s. North Winds around 5 Mph, becoming east around 5 Mph in the afternoon. Chance of rain 50 percent.

Tonight 19 Sep Coastal Horry

Mostly cloudy with a chance of Showers. A chance of Thunderstorms, mainly in the evening. Lows in the lower 70s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Intracoastal Waterway - William Island Temperature Statistics

September Temperature

North Myrtle Beach Grand Strand Airport (3.7 miles)

  • Lowest 16 September, 2026

    64.9 °F

  • Average September

    80.4 °F

  • Highest 14 September, 2026

    94.6 °F

Climate (2021–2026)

North Myrtle Beach Grand Strand Airport (3.7 miles)

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  • Average Low 2021–2026

    56.7 °F

  • Average 2021–2026

    65.2 °F

  • Average High 2021–2026

    73.7 °F
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