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Union, IL Weather Forecast
Union, IL Weather Forecast Date: 231 PM CST Tue Nov 03 2026
The area/counties/county of: Mchenry, including the cities of: Crystal Lake, Algonquin, Mchenry, and Woodstock.or toggle through each period.
Late This Afternoon... Showers likely. Breezy. Temperatures in the mid 60s. South winds 10 to 15 mph with gusts up to 30 mph. Chance of precipitation 70%.
Tonight... Showers. Lows in the upper 50s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of precipitation 90%.
Wednesday... Mostly cloudy. Showers likely early in the morning, then a chance of showers late in the morning. A slight chance of showers early in the afternoon. Breezy with highs in the lower 60s. Southwest winds 10 to 15 mph with gusts up to 30 mph. Chance of precipitation 60%.
Wednesday Night... Mostly cloudy. A slight chance of showers in the evening. A chance of showers late. Lows in the upper 40s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of precipitation 30%.
Thursday... Cloudy. A chance of showers. Highs in the mid 50s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of precipitation 50%.
Thursday Night... Cloudy. A chance of showers. Lows in the lower 40s. Northwest winds 5 to 10 mph, becoming north after midnight. Chance of precipitation 50%.
Friday... Mostly cloudy with a 20% chance of showers. Highs in the lower 50s.
Friday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows in the mid 30s.
Saturday... Partly cloudy. Highs in the lower 50s.
Saturday Night... Partly cloudy. Lows in the lower 30s.
Sunday... Partly cloudy. Highs in the upper 50s.
Sunday Night... Mostly clear. Lows in the mid 30s.
Monday... Mostly sunny. Highs around 60.
Monday Night... Mostly clear. Lows in the upper 30s.
POP = Probability of Precipitation
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