Arrowhead Lake Weather Forecast

    • 35
    • 61

    Becoming Sunny

    • 44
    • 62

    Rain Showers Likely

    • 48
    • 59

    Rain Showers Likely

    • 49
    • 67

    Mostly Cloudy

    • 49
    • 64

    Rain Showers Likely

    • 46
    • 65

    Partly Sunny

Today 22 Sep Central St. Louis

Patchy fog and frost this morning. Sunny. Highs around 60. Southeast Winds 5 to 10 Mph.

Tonight 22 Sep Central St. Louis

Mostly clear. Lows in the mid 30s. Southeast Winds around 5 Mph.

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Arrowhead Lake Temperature Statistics

September Temperature

Cook Municipal Airport (9.9 miles)

  • Lowest 14 September, 2026

    30.2 °F

  • Average September

    59.6 °F

  • Highest 3 September, 2026

    82.4 °F

Climate (2021–2026)

Cook Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    30.3 °F

  • Average 2021–2026

    41.6 °F

  • Average High 2021–2026

    51.7 °F
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