Meramec State Park Weather Forecast

    • 73
    • 95

    Chance Thunderstorms

    • 72
    • 96

    Slight Chance Thunderstorms

    • 72
    • 94

    Mostly Sunny

    • 70
    • 95

    Slight Chance Thunderstorms

    • 66
    • 91

    Slight Chance Thunderstorms

    • 63
    • 85

    Chance Rain Showers

    • 60
    • 80

    Slight Chance Rain Showers

Today 16 Sep Franklin

Mostly sunny with a chance of Showers and Thunderstorms. Near steady temperature in the lower 90s. South Winds around 5 Mph. Chance of rain 50 percent. Heat index Values up to 106.

Tonight 16 Sep Franklin

Mostly cloudy with a chance of Showers and Thunderstorms this Evening, then mostly clear after midnight. Lows in the lower 70s. South Winds around 5 Mph. Gusts up to 20 Mph this evening. Chance of rain 50 percent.

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  • Temperature Real-Time

Meramec State Park Temperature Statistics

September Temperature

Washington Regional Airport (26.1 miles)

  • Lowest 8 September, 2026

    62.6 °F

  • Average September

    80.4 °F

  • Highest 5 September, 2026

    102.2 °F

Climate (2021–2026)

Washington Regional Airport (26.1 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.7 °F
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