Thornton Weather Forecast

    • 44
    • 68

    Slight Chance Rain Showers

    • 50
    • 81

    Sunny

    • 49
    • 85

    Sunny

    • 49
    • 80

    Partly Sunny

    • 48
    • 83

    Mostly Sunny

    • 50
    • 82

    Partly Sunny

Today 15 Sep Washington Palouse

Mostly cloudy with a chance of rain Showers in the Morning, then partly cloudy in the afternoon. Highs in the mid 60s to lower 70s. Southwest wind 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 15 Sep Washington Palouse

Mostly clear. Patchy fog overnight. Lows in the lower 40s to lower 50s. Light wind.

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Thornton Temperature Statistics

September Temperature

Pullman / Moscow Regional Airport (28.6 miles)

  • Lowest 10 September, 2025

    50 °F

  • Average September

    71.7 °F

  • Highest 1 September, 2025

    97 °F

Climate (2020–Present)

Pullman / Moscow Regional Airport (28.6 miles)

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  • Average Low 2020–2025

    39.2 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    59.2 °F
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