Fairgrounds Weather Forecast

    • 49
    • 67

    Rain Showers Likely

    • 46
    • 67

    Partly Sunny

    • 49
    • 68

    Chance Rain Showers

    • 49
    • 69

    Mostly Cloudy

    • 48
    • 68

    Mostly Cloudy

    • 48
    • 70

    Partly Sunny

Today 16 Sep Pennington

Mostly cloudy with a 50 percent chance of Showers. Highs 65 to 70. South Winds around 5 Mph.

Tonight 16 Sep Pennington

Mostly cloudy. Showers Likely, mainly in the evening. Lows 45 to 50. East Winds around 5 Mph shifting to the north after midnight. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fairgrounds Temperature Statistics

September Temperature

Thief River Falls, Thief River Falls Regional Airport (3.7 miles)

  • Lowest 13 September, 2026

    42.1 °F

  • Average September

    64.9 °F

  • Highest 5 September, 2026

    84.9 °F

Climate (2021–2026)

Thief River Falls, Thief River Falls Regional Airport (3.7 miles)

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  • Average Low 2021–2026

    32.1 °F

  • Average 2021–2026

    41.1 °F

  • Average High 2021–2026

    49.9 °F
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