Princeton Weather Forecast

    • 62
    • 91

    Mostly Sunny

    • 60
    • 89

    Mostly Sunny

    • 58
    • 88

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

    • 61
    • 88

    Chance Rain Showers

    • 58
    • 81

    Chance Rain Showers

    • 56
    • 76

    Chance Rain Showers

Today 14 Sep Bureau

Sunny. Highs in the upper 80s. East Winds around 5 Mph.

Tonight 14 Sep Bureau

Mostly clear. Lows in the lower 60s. East Winds 5 to 10 Mph.

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Princeton Temperature Statistics

September Temperature

Illinois Valley Regional Airport (16.2 miles)

  • Lowest 7 September, 2025

    39.6 °F

  • Average September

    62.2 °F

  • Highest 12 September, 2025

    88.2 °F

Climate (2020–Present)

Illinois Valley Regional Airport (16.2 miles)

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  • Average Low 2020–2025

    43.1 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62 °F
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