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Lebanon, IL Weather Tomorrow

Stay one step ahead with tomorrow's weather in Lebanon and a reliable 5 day forecast including 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 across the Lebanon area and around St. Clair county, Illinois.
Updated: Mon Aug 31st 2026 8:15 AM CDT
Lebanon, IL Weather – 8-31 – Overcast
99° / 68°
Overcast
Lebanon may see overcast, with daytime highs of 99°F and overnight lows near 68°F. There's a very small chance of rainfall, only about 5%. Wind will be moderate, blowing around 15mph on average and gusts of 29.5mph at 10 PM. Humidity levels should be comfortable, sitting around 48% on average, the maximum being 56% at 9 AM and 23% being its lowest at 4 PM. Barometric pressure is its highest of 30.03inHg at 9 AM, a lowest point of 29.9inHg at 5 PM with an avg 29.95inHg.
Lebanon, IL Weather – 9-1 – Sunny
102° / 76°

Weather Tomorrow

Sunny
Daytime highs will reach 102°F with lows dropping to 76°F in Lebanon, where it will be sunny. There's a very small chance of rainfall, only about 1%. Wind will be moderate, blowing around 13mph on average and gusts of 33.6mph at 1 AM. Humidity levels should be comfortable, sitting around 44% on average, the maximum being 65% at 5 AM and 24% being its lowest at 5 PM. Barometric pressure is its highest of 30.01inHg at 9 AM, a lowest point of 29.89inHg at 5 PM with an avg 29.95inHg.
Lebanon, IL Weather – 9-2 – Sunny
102° / 78°
Sunny
Lebanon may see sunshine, with daytime highs of 102°F and overnight lows near 78°F. There's a very small chance of rainfall, only about 1%. Wind will be moderate, blowing around 13mph on average and gusts of 32.3mph at 1 AM. Humidity levels should be comfortable, sitting around 42% on average, the maximum being 64% at 7 AM and 24% being its lowest at 4 PM. Barometric pressure is its highest of 30inHg at 9 AM, a lowest point of 29.87inHg at 5 PM with an avg 29.93inHg.
Lebanon, IL Weather – 9-3 – Sunny
103° / 80°
Sunny
In Lebanon, bright and sunny conditions with highs near 103°F and lows around 80°F. There's a very small chance of rainfall, only about 2%. Wind will be moderate, blowing around 15mph on average and gusts of 31.4mph at 12 AM. Humidity levels should be comfortable, sitting around 41% on average, the maximum being 61% at 7 AM and 24% being its lowest at 3 PM. Barometric pressure is its highest of 29.96inHg at 9 AM, a lowest point of 29.85inHg at 5 PM with an avg 29.91inHg.
Lebanon, IL Weather – 9-4 – Sunny
104° / 79°
Sunny
Daytime highs will reach 104°F with lows dropping to 79°F in Lebanon, where bright and sunny conditions. There's a moderate 36% chance of rainfall with an estimated 0.01in. Wind will be moderate, blowing around 12mph on average and gusts of 21.3mph at 1 AM. Humidity levels should be comfortable, sitting around 45% on average, the maximum being 61% at 7 AM and 22% being its lowest at 4 PM. Barometric pressure is its highest of 29.97inHg at 12 PM, a lowest point of 29.81inHg at 5 PM with an avg 29.88inHg.
Lebanon, IL Weather – 9-5 – Overcast
101° / 79°
Overcast
Daytime highs will reach 101°F with lows dropping to 79°F in Lebanon, where skies will be overcast. There's a very small chance of rainfall, only about 8%. Winds will be light at 10mph and gusts of 20.6mph at 4 PM. Humidity levels should be comfortable, sitting around 48% on average, the maximum being 76% at 11 PM and 29% being its lowest at 4 PM. Barometric pressure is its highest of 29.93inHg at 10 AM, a lowest point of 29.81inHg at 7 PM with an avg 29.87inHg.

Currently

Sunny 74°F
30.03 inHg.
Barometer
71%
Humidity
SSW 11.5 mph
Wind
Sunny

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