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City of Princeton, IllinoisPrinceton, IL 7-Day Night Weather Forecast
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Princeton, IL Weather Forecast
Princeton, IL Weather Forecast Date: 531 AM CDT Sat Sep 19 2026
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Today... Mostly cloudy. Patchy fog this morning. Occasional thunderstorms and showers likely this morning, then a chance of showers and thunderstorms this afternoon. Highs in the lower 80s. Southeast winds 5 to 10 mph. Chance of rain 90%.
Tonight... A chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Patchy fog after midnight. Humid with lows in the mid 60s. South winds around 5 mph, becoming northwest after midnight. Chance of rain near 100%.
Sunday... Patchy fog in the morning. Showers. Highs in the lower 70s. Northeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90%.
Sunday Night... Mostly cloudy with a chance of showers. Lows in the upper 50s. Northeast winds around 15 mph with gusts up to 25 mph. Chance of rain 50%.
Monday... Showers likely, mainly in the morning. Highs in the mid 60s. Northeast winds around 15 mph with gusts up to 25 mph. Chance of rain 70%.
Monday Night... Mostly cloudy. Lows in the lower 50s. Highs in the lower 60s.
Tuesday... Mostly cloudy. Lows in the lower 50s. Highs in the lower 60s.
Tuesday Night... Partly cloudy. Lows in the lower 50s. Highs in the upper 60s.
Wednesday... Partly cloudy. Lows in the lower 50s. Highs in the upper 60s.
Thursday... Partly sunny. Highs in the upper 60s.
Thursday Night... Partly cloudy. Lows in the lower 50s. Highs in the lower 70s.
POP = Probability of Precipitation
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