Great Lakes, IL Weather Forecast for 5-Days

Updated: Wed Feb 18th 2026 6:15 AM CST

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Great Lakes, IL Weather – 2-18 – Scattered Showers
66° / 43°
Scattered Showers
Showers likely at times in Great Lakes, with a high of 66°F and a low of 43°F. The chance of rain is 86% with an estimated 0.13in. Wind will be moderate, blowing around 17mph on average and gusts of 26.3mph at 7 AM. The humidity will be on the higher side, averaging about 67%, the maximum being 92% at 7 AM and 14% being its lowest at 4 PM. Barometric pressure is its highest of 29.72inHg at 10 PM, a lowest point of 29.46inHg at 7 AM with an avg 29.56inHg.
Great Lakes, IL Weather – 2-19 – Scattered Showers
45° / 37°

Weather Tomorrow

Scattered Showers
In Great Lakes, on and off showers are set to occur with highs near 45°F and lows around 37°F. The chance of rain is 87% with an estimated 0.14in. Winds will be light at 9mph and gusts of 13mph at 5 PM. High humidity with average of 82% is anticipated, the maximum being 98% at 10 PM and 58% 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.
Great Lakes, IL Weather – 2-20 – Moderate Rain
41° / 30°
Moderate Rain
In Great Lakes, rain showers are likely with a high near 41°F and a low around 30°F. The chance of rain is 88% with an estimated 0.75in. Winds will be strong at speeds peaking at 23mph and gusts of 32.1mph at 2 AM. High humidity with average of 81% is anticipated, the maximum being 98% at 11 PM and 67% being its lowest at 4 PM. Barometric pressure is its highest of 29.86inHg at 10 PM, a lowest point of 29.35inHg at 4 AM with an avg 29.55inHg.
Great Lakes, IL Weather – 2-21 – Partly Cloudy
36° / 26°
Partly Cloudy
Overcast conditions are in the forecast for Great Lakes, with a high of 36°F and a low of 26°F. Wind will be moderate, blowing around 12mph on average and gusts of 16.2mph at 9 PM. The humidity will be on the higher side, averaging about 63%, the maximum being 77% at 4 AM and 45% being its lowest at 3 PM. Barometric pressure is its highest of 30.22inHg at 9 PM, a lowest point of 29.49inHg at 12 AM with an avg 30.09inHg.
Great Lakes, IL Weather – 2-22 – Light Snow Showers
28° / 21°
Light Snow Showers
Highs will reach 28°F with lows near 21°F in Great Lakes, where light Snow Showers are. Rainfall predicted to have a 64% chance 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 20.1mph at 11 PM. The humidity will be on the higher side, averaging about 64%, the maximum being 83% at 1 AM and 48% being its lowest at 12 PM. Barometric pressure is its highest of 30.4inHg at 11 PM, a lowest point of 29.95inHg at 12 AM with an avg 30.28inHg.
Great Lakes, IL Weather – 2-23 – Overcast
25° / 14°
Overcast
In Great Lakes, it will be overcast with highs near 25°F and lows around 14°F. Wind will be moderate, blowing around 16mph on average and gusts of 20.2mph 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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