Thief River Falls Weather Forecast

    • 41
    • 65

    Becoming Sunny

    • 48
    • 67

    Chance Rain Showers

    • 47
    • 68

    Partly Sunny

    • 52
    • 70

    Chance Rain Showers

    • 49
    • 70

    Slight Chance Rain Showers

    • 47
    • 72

    Partly Sunny

Today 15 Sep Pennington

Partly sunny. Highs in the mid 60s. Breezy. West Winds 15 to 25 Mph with Gusts to around 35 Mph.

Tonight 15 Sep Pennington

Mostly clear. Lows 40 to 45. Northwest Winds around 5 Mph shifting to the northeast after midnight.

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Thief River Falls Temperature Statistics

September Temperature

Thief River Falls, Thief River Falls Regional Airport (3.1 miles)

  • Lowest 13 September, 2026

    42.1 °F

  • Average September

    65.9 °F

  • Highest 5 September, 2026

    84.9 °F

Climate (2021–2026)

Thief River Falls, Thief River Falls Regional Airport (3.1 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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