Princeton Weather Forecast

    • 51
    • 81

    Mostly Sunny

    • 63
    • 79

    Partly Sunny

    • 67
    • 77

    Rain Showers

    • 55
    • 73

    Rain Showers

    • 50
    • 67

    Chance Rain Showers

    • 52
    • 67

    Chance Rain Showers

    • 48
    • 67

    Mostly Sunny

Today 28 Sep Bureau

Mostly clear. Lows in the upper 40s. Highs in the lower 60s.

Tonight 28 Sep Bureau

Mostly clear. Lows in the lower 50s. Northeast Winds around 5 Mph, becoming southeast after midnight.

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Princeton Temperature Statistics

September Temperature

Illinois Valley Regional Airport (16.2 miles)

  • Lowest 26 September, 2026

    48.2 °F

  • Average September

    71.1 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Illinois Valley Regional Airport (16.2 miles)

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  • Average Low 2021–2026

    43.3 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    62.5 °F
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