Crystal Airport Weather Forecast

    • 58
    • 83

    Increasing Clouds

    • 51
    • 72

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 61
    • 81

    Chance Rain Showers

    • 59
    • 76

    Rain Showers Likely

    • 57
    • 78

    Chance Rain Showers

Today 18 Sep St. Clair

Mostly sunny in the Morning, then a slight chance of Showers early in the afternoon. Partly cloudy with a chance of Showers and a slight chance of Thunderstorms in the late afternoon. Highs in the lower 80s. Temperatures falling into the in the lower 70s in the afternoon. Northwest Winds up to 10 Mph, becoming northeast in the late afternoon. Chance of rain 30 percent.

Tonight 18 Sep St. Clair

Mostly cloudy. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.

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Crystal Airport Temperature Statistics

September Temperature

St Clair County International Airport (5 miles)

  • Lowest 7 September, 2025

    37.4 °F
  • Average September

    59.3 °F
  • Highest 3 September, 2025

    80.6 °F

Climate (2020–Present)

St Clair County International Airport (5 miles)

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  • Average Low 2020–2025

    40 °F
  • Average 2020–2025

    49.5 °F
  • Average High 2020–2025

    58.6 °F
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