Simpson Lake Weather Forecast

    • 43
    • 57

    Chance Rain Showers

    • 39
    • 60

    Partly Sunny

    • 43
    • 64

    Mostly Sunny

    • 56
    • 71

    Mostly Cloudy

    • 55
    • 72

    Slight Chance Thunderstorms

    • 48
    • 71

    Mostly Cloudy

Today 5 Sep Polk

Mostly cloudy. Chance of Sprinkles until late Afternoon, then chance of rain Showers late in the afternoon. Highs in the mid 50s. West Winds 10 to 15 Mph. Chance of Showers 20 percent.

Tonight 5 Sep Polk

Mostly cloudy. A 20 percent chance of rain Showers in the evening. Lows in the lower 40s. West Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Simpson Lake Temperature Statistics

September Temperature

Rush City Regional Airport (15.5 miles)

  • Lowest 3 September, 2025

    44.6 °F

  • Average September

    59.6 °F

  • Highest 1 September, 2025

    75.2 °F

Climate (2020–Present)

Rush City Regional Airport (15.5 miles)

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  • Average Low 2020–2025

    35.5 °F

  • Average 2020–2025

    45.3 °F

  • Average High 2020–2025

    54.7 °F
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