Royal Lakes Weather Forecast

    • 75
    • 93

    Slight Chance Thunderstorms

    • 75
    • 94

    Mostly Sunny

    • 67
    • 89

    Mostly Sunny

    • 63
    • 86

    Mostly Sunny

    • 65
    • 87

    Partly Sunny

    • 65
    • 84

    Slight Chance Thunderstorms

Today 26 Jul Macoupin

Mostly sunny. Patchy fog this morning. Scattered Showers and Thunderstorms this afternoon. Hot with Highs in the mid 90s. South Winds around 5 Mph, becoming southwest around 5 Mph this afternoon. Chance of rain 30 percent. Heat index Values up to 114.

Tonight 26 Jul Macoupin

Partly cloudy. Scattered Showers and Thunderstorms in the evening. Humid with Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 30 percent. Heat index Values up to 110 early in the evening.

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Royal Lakes Temperature Statistics

July Temperature

St. Louis Regional Airport (15.5 miles)

  • Lowest 24 July, 2026

    59.9 °F

  • Average July

    76.5 °F

  • Highest 2 July, 2026

    93.2 °F

Climate (2021–2026)

St. Louis Regional Airport (15.5 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    54.5 °F

  • Average High 2021–2026

    66.6 °F
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