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Lanark, IL Weather Tomorrow

Find tomorrow's weather forecast for Lanark with an accurate 5 day outlook showing precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction for the Lanark area and around Carroll county, Illinois.
Updated: Fri Sep 25th 2026 2:45 PM CDT
Lanark, IL Weather – 9-25 – Overcast
66° / 55°
Overcast
Overcast is in the forecast for Lanark, with a high of 66°F and a low of 55°F. There's a moderate 26% chance of rainfall with an estimated 0in. Winds will be light at 8mph and gusts of 9mph at 7 PM. High humidity with average of 83% is anticipated, the maximum being 88% at 11 PM and 69% being its lowest at 4 PM. Barometric pressure is its highest of 30.25inHg at 8 PM, a lowest point of 30.21inHg at 5 PM with an avg 30.23inHg.
Lanark, IL Weather – 9-26 – Overcast
66° / 51°

Weather Tomorrow

Overcast
Lanark may see overcast, with daytime highs of 66°F and overnight lows near 51°F. There might be light rainfall having a 17% chance. Winds will be light at 9mph and gusts of 14.1mph at 5 AM. The humidity will be on the higher side, averaging about 70%, the maximum being 89% at 12 AM and 53% being its lowest at 3 PM. Barometric pressure is its highest of 30.24inHg at 12 AM, a lowest point of 30.1inHg at 5 PM with an avg 30.17inHg.
Lanark, IL Weather – 9-27 – Overcast
67° / 52°
Overcast
It will be overcast in Lanark, with a high of 67°F and a low of 52°F. There might be light rainfall having a 11% chance. Winds will be light at 7mph and gusts of 16.3mph at 7 AM. The humidity will be on the higher side, averaging about 64%, the maximum being 82% at 11 PM and 49% being its lowest at 4 PM. Barometric pressure is its highest of 30.14inHg at 11 AM, a lowest point of 30.07inHg at 5 PM with an avg 30.11inHg.
Lanark, IL Weather – 9-28 – Sunny
69° / 50°
Sunny
Bright and sunny conditions in Lanark, with a high of 69°F and a low of 50°F. There's a very small chance of rainfall, only about 7%. Winds will be light at 7mph and gusts of 16.8mph at 4 AM. The humidity will be on the higher side, averaging about 70%, the maximum being 88% at 1 AM and 53% being its lowest at 3 PM. Barometric pressure is its highest of 30.12inHg at 7 AM, a lowest point of 29.96inHg at 11 PM with an avg 30.06inHg.
Lanark, IL Weather – 9-29 – Overcast
60° / 54°
Overcast
It will be overcast in Lanark, with a high of 60°F and a low of 54°F. The chance of rain is 91% with an estimated 0.82in. Wind will be moderate, blowing around 14mph on average and gusts of 32mph at 6 PM. High humidity with average of 87% is anticipated, the maximum being 98% at 8 PM and 74% being its lowest at 10 AM. Barometric pressure is its highest of 29.96inHg at 12 AM, a lowest point of 29.78inHg at 11 PM with an avg 29.88inHg.
Lanark, IL Weather – 9-30 – Light Rain Shower
64° / 59°
Light Rain Shower
Daytime highs will reach 64°F with lows dropping to 59°F in Lanark, where periods of rain are likely. The chance of rain is 94% with an estimated 3.25in. Wind will be moderate, blowing around 15mph on average and gusts of 32mph at 4 PM. High humidity with average of 98% is anticipated, the maximum being 99% at 8 PM and 94% being its lowest at 2 AM. Barometric pressure is its highest of 29.78inHg at 12 AM, a lowest point of 29.66inHg at 5 PM with an avg 29.71inHg.

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