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Grayslake, IL Weather Forecast for 5-Days

Updated: Wed Feb 18th 2026 5:30 AM CST

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Grayslake, IL Weather – 2-18 – Scattered Showers
66° / 41°
Scattered Showers
Scattered showers are in the forecast for Grayslake, with a high of 66°F and a low of 41°F. Rainfall predicted to have a 73% chance with an estimated 0.12in. Wind will be moderate, blowing around 18mph on average and gusts of 26.1mph at 7 AM. The humidity will be on the higher side, averaging about 68%, the maximum being 93% at 7 AM and 13% being its lowest at 4 PM. Barometric pressure is its highest of 29.72inHg at 10 PM, a lowest point of 29.45inHg at 7 AM with an avg 29.56inHg.
Grayslake, IL Weather – 2-19 – Scattered Showers
46° / 37°

Weather Tomorrow

Scattered Showers
Grayslake may see passing showers, with daytime highs of 46°F and overnight lows near 37°F. The chance of rain is 89% with an estimated 0.1in. Winds will be light at 9mph and gusts of 13.9mph at 6 PM. High humidity with average of 82% is anticipated, the maximum being 98% at 10 PM and 63% being its lowest at 12 AM. Barometric pressure is its highest of 29.75inHg at 7 AM, a lowest point of 29.42inHg at 11 PM with an avg 29.66inHg.
Grayslake, IL Weather – 2-20 – Moderate Rain
40° / 30°
Moderate Rain
Daytime highs will reach 40°F with lows dropping to 30°F in Grayslake, where periods of rain are likely. The chance of rain is 77% with an estimated 0.73in. Winds will be strong at speeds peaking at 23mph and gusts of 32.1mph at 2 AM. High humidity with average of 82% is anticipated, the maximum being 98% at 11 PM and 68% being its lowest at 4 PM. Barometric pressure is its highest of 29.87inHg at 10 PM, a lowest point of 29.35inHg at 4 AM with an avg 29.55inHg.
Grayslake, IL Weather – 2-21 – Partly Cloudy
35° / 25°
Partly Cloudy
Daytime highs will reach 35°F with lows dropping to 25°F in Grayslake, where skies will be cloudy. Wind will be moderate, blowing around 12mph on average and gusts of 16.8mph at 9 PM. The humidity will be on the higher side, averaging about 63%, the maximum being 78% at 4 AM and 45% being its lowest at 2 PM. Barometric pressure is its highest of 30.23inHg at 9 PM, a lowest point of 29.49inHg at 12 AM with an avg 30.09inHg.
Grayslake, IL Weather – 2-22 – Light Snow Showers
28° / 20°
Light Snow Showers
Grayslake may see light Snow Showers, with daytime highs of 28°F and overnight lows near 20°F. The chance of rain is 78% with an estimated 0.01in. Snow is likely with a 38% chance with an estimated 0.1in. Wind will be moderate, blowing around 16mph on average and gusts of 20.8mph at 11 PM. The humidity will be on the higher side, averaging about 64%, the maximum being 84% at 1 AM and 48% being its lowest at 12 PM. Barometric pressure is its highest of 30.41inHg at 11 PM, a lowest point of 29.95inHg at 12 AM with an avg 30.29inHg.
Grayslake, IL Weather – 2-23 – Overcast
24° / 13°
Overcast
In Grayslake, skies will be overcast with highs near 24°F and lows around 13°F. Wind will be moderate, blowing around 16mph on average and gusts of 20.9mph at 12 AM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 66% at 6 AM and 37% being its lowest at 3 PM. Barometric pressure is its highest of 30.56inHg at 9 AM, a lowest point of 30.41inHg at 12 AM with an avg 30.5inHg.

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