Princeton Weather Forecast

    • 51
    • 64

    Rain Showers

    • 46
    • 56

    Chance Rain Showers

    • 43
    • 62

    Slight Chance Rain Showers

    • 45
    • 66

    Partly Sunny

    • 47
    • 66

    Chance Rain Showers

    • 47
    • 65

    Chance Rain Showers

    • 49
    • 68

    Chance Rain Showers

Today 20 May Bureau

Showers with Thunderstorms likely. Highs in the mid 60s. Southeast Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 80 percent.

Tonight 20 May Bureau

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms. Lows in the lower 50s. Northeast Winds 5 to 10 Mph, becoming west with Gusts up to 20 Mph. Chance of rain 50 percent.

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Princeton Temperature Statistics

May Temperature

Illinois Valley Regional Airport (16.2 miles)

  • Lowest 9 May, 2025

    38.3 °F

  • Average May

    63.2 °F

  • Highest 15 May, 2025

    97.5 °F

Climate (2020–Present)

Illinois Valley Regional Airport (16.2 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62.1 °F
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