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Princeton, IL Weather Tomorrow

Prepare for the week ahead with tomorrow's Princeton weather forecast and a complete 5 day outlook covering precipitation probability, daily and nightly weather conditions, high and low temperature trends, sunrise and sunset information, sky cover, wind speed, wind direction, and wind chill throughout the Princeton area and around Bureau county, Illinois.
Updated: Fri Oct 16th 2026 2:15 PM CDT
Princeton, IL Weather – 10-16 – Sunny
53° / 42°
Sunny
Princeton may see sunshine, with daytime highs of 53°F and overnight lows near 42°F. There's a moderate 43% chance of rainfall with an estimated 0.02in. Winds will be strong at speeds peaking at 21mph and gusts of 30mph at 7 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 73% at 8 PM and 70% being its lowest at 3 PM. Barometric pressure is its highest of 30.44inHg at 11 PM, a lowest point of 30.16inHg at 3 PM with an avg 30.32inHg.
Princeton, IL Weather – 10-17 – Sunny
54° / 36°

Weather Tomorrow

Sunny
In Princeton, it will be sunny with highs near 54°F and lows around 36°F. There's a very small chance of rainfall, only about 3%. Wind will be moderate, blowing around 13mph on average and gusts of 26.7mph at 1 AM. Humidity levels should be comfortable, sitting around 59% on average, the maximum being 83% at 5 AM and 35% being its lowest at 3 PM. Barometric pressure is its highest of 30.56inHg at 9 AM, a lowest point of 30.44inHg at 5 PM with an avg 30.49inHg.
Princeton, IL Weather – 10-18 – Sunny
59° / 40°
Sunny
It will be sunny in Princeton, with a high of 59°F and a low of 40°F. There's a very small chance of rainfall, only about 2%. Wind will be moderate, blowing around 14mph on average and gusts of 22.1mph at 9 AM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 74% at 4 AM and 34% being its lowest at 2 PM. Barometric pressure is its highest of 30.48inHg at 9 AM, a lowest point of 30.35inHg at 5 PM with an avg 30.42inHg.
Princeton, IL Weather – 10-19 – Sunny
64° / 43°
Sunny
Princeton may see sunshine, with daytime highs of 64°F and overnight lows near 43°F. There's a very small chance of rainfall, only about 4%. Winds will be light at 8mph and gusts of 16.1mph at 8 AM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 62% at 8 AM and 37% being its lowest at 4 PM. Barometric pressure is its highest of 30.41inHg at 9 AM, a lowest point of 30.31inHg at 5 PM with an avg 30.36inHg.
Princeton, IL Weather – 10-20 – Overcast
64° / 48°
Overcast
Overcast is in the forecast for Princeton, with a high of 64°F and a low of 48°F. There's a very small chance of rainfall, only about 9%. Winds will be light at 8mph and gusts of 16.6mph at 12 AM. Humidity levels should be comfortable, sitting around 52% on average, the maximum being 60% at 8 AM and 36% being its lowest at 3 PM. Barometric pressure is its highest of 30.4inHg at 10 AM, a lowest point of 30.33inHg at 5 PM with an avg 30.36inHg.
Princeton, IL Weather – 10-21 – Sunny
66° / 48°
Sunny
Daytime highs will reach 66°F with lows dropping to 48°F in Princeton, where it will be sunny. There's a very small chance of rainfall, only about 3%. Winds will be light at 9mph and gusts of 12.3mph at 11 PM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 65% at 7 AM and 37% being its lowest at 4 PM. Barometric pressure is its highest of 30.35inHg at 12 AM, a lowest point of 30.2inHg at 11 PM with an avg 30.29inHg.

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