Eureka Weather Forecast

    • 66
    • 91

    Increasing Clouds

    • 60
    • 78

    Chance Rain Showers

    • 53
    • 71

    Mostly Cloudy

    • 53
    • 72

    Partly Sunny

    • 56
    • 74

    Mostly Cloudy

    • 58
    • 77

    Slight Chance Rain Showers

Today 20 Sep St. Louis

Partly sunny. Highs in the lower 90s. West Winds 5 to 10 Mph.

Tonight 20 Sep St. Louis

Showers likely with a chance of Thunderstorms. Lows in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Real-Time

Eureka Temperature Statistics

September Temperature

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

  • Lowest 8 September, 2026

    59.6 °F

  • Average September

    81.5 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

St. Louis, Spirit Of St. Louis Airport (10.6 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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