Union County, IL Weather Tomorrow

See tomorrow's forecast for Union County together with a reliable 5 day outlook featuring precipitation probability, daily and nightly weather conditions, high and low temperature trends, sunrise and sunset information, sky cover, wind speed, wind direction, and wind chill for the Union County area.
Updated: Wed Nov 11th 2026 11:00 PM CST
Union County, IL Weather – 11-11 – Sunny
72° / 49°
Sunny
Union County, IL Weather – 11-12 – Sunny
55° / 39°

Weather Tomorrow

Sunny
Union County is set for sunshine with temperatures peaking at 55°F and dipping to 39°F. There's a very small chance of rainfall, only about 6% with an estimated 0in. Wind will be moderate, blowing around 16mph on average and gusts of 28.2mph at 3 PM. The humidity will be on the higher side, averaging about 63%, the maximum being 88% at 6 AM and 43% being its lowest at 3 PM. Barometric pressure is its highest of 30.02inHg at 9 PM, a lowest point of 29.86inHg at 12 AM with an avg 29.93inHg.
Union County, IL Weather – 11-13 – Partly Cloudy
45° / 35°
Partly Cloudy
Skies will be cloudy in Union County, with a high of 45°F and a low of 35°F. There's a very small chance of rainfall, only about 6%. Wind will be moderate, blowing around 13mph on average and gusts of 22.2mph at 8 AM. Humidity levels should be comfortable, sitting around 58% on average, the maximum being 68% at 6 AM and 46% being its lowest at 2 PM. Barometric pressure is its highest of 30.14inHg at 10 PM, a lowest point of 30.01inHg at 1 AM with an avg 30.06inHg.
Union County, IL Weather – 11-14 – Sunny
47° / 31°
Sunny
Highs will reach 47°F with lows near 31°F in Union County, where a sunny day is. There's a very small chance of rainfall, only about 4%. Snow is likely with a 6% chance. Winds will be light at 7mph and gusts of 14.5mph at 12 AM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 80% at 6 AM and 39% being its lowest at 1 PM. Barometric pressure is its highest of 30.33inHg at 11 PM, a lowest point of 30.15inHg at 12 AM with an avg 30.25inHg.
Union County, IL Weather – 11-15 – Partly Cloudy
51° / 33°
Partly Cloudy
Cloudy skies are in the forecast for Union County, with a high of 51°F and a low of 33°F. There's a very small chance of rainfall, only about 9%. Winds will be light at 6mph and gusts of 15mph at 4 AM. The humidity will be on the higher side, averaging about 61%, the maximum being 75% at 6 AM and 41% being its lowest at 12 PM. Barometric pressure is its highest of 30.46inHg at 10 PM, a lowest point of 30.34inHg at 12 AM with an avg 30.41inHg.
Union County, IL Weather – 11-16 – Sunny
54° / 34°
Sunny
It will be sunny in Union County, with a high of 54°F and a low of 34°F. There's a very small chance of rainfall, only about 5%. Winds will be light at 6mph and gusts of 12.2mph at 8 AM. The humidity will be on the higher side, averaging about 67%, the maximum being 86% at 6 AM and 44% being its lowest at 12 PM. Barometric pressure is its highest of 30.54inHg at 8 AM, a lowest point of 30.44inHg at 3 PM with an avg 30.49inHg.

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