Princeton Weather Forecast

    • 70
    • 86

    Chance Thunderstorms

    • 70
    • 86

    Rain Showers Likely

    • 68
    • 85

    Chance Thunderstorms

    • 64
    • 79

    Rain Showers Likely

    • 64
    • 77

    Chance Rain Showers

    • 66
    • 80

    Chance Thunderstorms

Today 10 Aug Bureau

Partly sunny. Scattered Showers and Thunderstorms this afternoon. Highs in the mid 80s. South Winds around 5 Mph. Chance of rain 40 percent.

Tonight 10 Aug Bureau

Partly cloudy with scattered Showers and Thunderstorms in the Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms after midnight. Patchy fog after midnight. Humid with Lows around 70. East Winds around 5 Mph. Chance of rain 30 percent.

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Princeton Temperature Statistics

August Temperature

Illinois Valley Regional Airport (16.2 miles)

  • Lowest 3 August, 2026

    60.8 °F

  • Average August

    73 °F

  • Highest 7 August, 2026

    86 °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

    62.6 °F
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