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Round Lake, IL Weather Forecast for 5-Days

Updated: Wed Feb 18th 2026 8:00 AM CST

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Round Lake, IL Weather – 2-18 – Scattered Showers
66° / 41°
Scattered Showers
In Round Lake, on and off showers are set to occur with highs near 66°F and lows around 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 24mph at 8 AM. The humidity will be on the higher side, averaging about 68%, the maximum being 92% at 8 AM and 13% being its lowest at 4 PM. Barometric pressure is its highest of 29.72inHg at 10 PM, a lowest point of 29.47inHg at 8 AM with an avg 29.56inHg.
Round Lake, IL Weather – 2-19 – Scattered Showers
46° / 37°

Weather Tomorrow

Scattered Showers
Showers likely at times in Round Lake, with a high of 46°F and a low of 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 1 AM, a lowest point of 29.42inHg at 11 PM with an avg 29.66inHg.
Round Lake, IL Weather – 2-20 – Moderate Rain
40° / 30°
Moderate Rain
In Round Lake, it will rain at times with highs near 40°F and lows around 30°F. 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.
Round Lake, IL Weather – 2-21 – Partly Cloudy
35° / 25°
Partly Cloudy
Overcast conditions are in the forecast for Round Lake, with a high of 35°F and a low of 25°F. 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.
Round Lake, IL Weather – 2-22 – Light Snow Showers
28° / 20°
Light Snow Showers
Highs will reach 28°F with lows near 20°F in Round Lake, where light Snow Showers are. 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.
Round Lake, IL Weather – 2-23 – Overcast
24° / 13°
Overcast
Highs will reach 24°F with lows near 13°F in Round Lake, where cloud-filled skies are. 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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