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Dupo, IL Weather Tomorrow

Everything you need for tomorrow's Dupo weather and the next 5 days is here, including daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Dupo area and around St. Clair county, Illinois.
Updated: Mon Oct 19th 2026 1:30 AM CDT
Dupo, IL Weather – 10-19 – Sunny
72° / 47°
Sunny
In Dupo, it will be sunny with highs near 72°F and lows around 47°F. There's a very small chance of rainfall, only about 3%. Winds will be light at 7mph and gusts of 15.4mph at 8 PM. Humidity levels should be comfortable, sitting around 43% on average, the maximum being 58% at 7 AM and 26% being its lowest at 2 PM. Barometric pressure is its highest of 30.4inHg at 9 AM, a lowest point of 30.27inHg at 4 PM with an avg 30.33inHg.
Dupo, IL Weather – 10-20 – Sunny
74° / 54°

Weather Tomorrow

Sunny
Bright and sunny conditions in Dupo, with a high of 74°F and a low of 54°F. There's a very small chance of rainfall, only about 4%. Winds will be light at 7mph and gusts of 15.4mph at 3 PM. Humidity levels should be comfortable, sitting around 43% on average, the maximum being 54% at 6 AM and 27% being its lowest at 3 PM. Barometric pressure is its highest of 30.35inHg at 10 AM, a lowest point of 30.25inHg at 4 PM with an avg 30.29inHg.
Dupo, IL Weather – 10-21 – Sunny
75° / 52°
Sunny
A sunny day is in the forecast for Dupo, with a high of 75°F and a low of 52°F. There's a very small chance of rainfall, only about 1%. Winds will be light at 5mph and gusts of 12.8mph at 1 PM. Humidity levels should be comfortable, sitting around 41% on average, the maximum being 54% at 7 AM and 26% being its lowest at 4 PM. Barometric pressure is its highest of 30.29inHg at 8 AM, a lowest point of 30.18inHg at 5 PM with an avg 30.24inHg.
Dupo, IL Weather – 10-22 – Smoky Haze
77° / 54°
Smoky Haze
Dupo could see smoky Haze with daytime highs of 77°F and nighttime lows near 54°F. There's a very small chance of rainfall, only about 1%. Winds will be light at 5mph and gusts of 14.3mph at 4 PM. Humidity levels should be comfortable, sitting around 38% on average, the maximum being 48% at 7 AM and 25% being its lowest at 3 PM. Barometric pressure is its highest of 30.27inHg at 9 AM, a lowest point of 30.16inHg at 5 PM with an avg 30.21inHg.
Dupo, IL Weather – 10-23 – Sunny
78° / 55°
Sunny
Daytime highs will reach 78°F with lows dropping to 55°F in Dupo, where bright and sunny conditions. There's a very small chance of rainfall, only about 3%. Winds will be light at 8mph and gusts of 18.1mph at 11 PM. Humidity levels should be comfortable, sitting around 39% on average, the maximum being 50% at 7 AM and 27% being its lowest at 2 PM. Barometric pressure is its highest of 30.27inHg at 10 AM, a lowest point of 30.18inHg at 4 PM with an avg 30.22inHg.
Dupo, IL Weather – 10-24 – Overcast
79° / 55°
Overcast
In Dupo, skies will be overcast with highs near 79°F and lows around 55°F. There's a very small chance of rainfall, only about 9%. Winds will be light at 10mph and gusts of 18.1mph at 1 AM. Humidity levels should be comfortable, sitting around 37% on average, the maximum being 48% at 11 PM and 24% being its lowest at 4 PM. Barometric pressure is its highest of 30.34inHg at 10 AM, a lowest point of 30.24inHg at 12 AM with an avg 30.29inHg.

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