One last beautiful day before Central Illinois weather takes a turn

DECATUR, Ill. (WAND) – Temperatures are running about 10 degrees warmer than recent mornings, starting in the upper 40s and low 50s. Sunny skies will dominate throughout the day, with highs climbing into the upper 60s and low 70s — a few degrees warmer than Monday.

The combination of mild temperatures and calm winds makes Tuesday an ideal day to tackle any outdoor projects or activities you’ve been putting off.

Wednesday: The System Arrives

The weather pattern shifts dramatically as a low-pressure system moves into the Midwest overnight. Expect increasing clouds as you wake up Wednesday morning, with temperatures in the mid-40s.

Partly to mostly cloudy skies will persist throughout the day as the system settles over Central Illinois. Northwesterly winds will pick up, keeping afternoon highs cooler — only reaching the low to mid-60s.

Rain Chances Decrease

The precipitation story has evolved. While earlier forecasts suggested more significant rainfall, high-resolution models now indicate lighter activity. Most models show only a few light showers possible earlier Wednesday, mainly north of the I-72 corridor.

The latest data shows only a 15-25% chance of measurable rain (more than 0.25 inches), with any activity focused along and northeast of a Bloomington to Paris line. Most of Central Illinois should remain dry or see only minimal moisture.

As the system exits Wednesday night, any remaining rain chances will shift eastward, with only a few sprinkles possible across the area.

Thursday & Friday: Cold and Blustery

The real story arrives behind the departing low-pressure system. Cold air and strong winds will dominate your Thursday and Friday.

High temperatures will struggle to reach the mid-to-upper 40s both days. Northwesterly winds gusting 20-25 mph will make it feel significantly colder, with wind-chill values dropping into the 30s. Bundle up if you’re heading outside, and secure any loose outdoor items.

Friday Night: The Coldest Night of Fall

Clear skies and diminishing winds Friday night will allow temperatures to plummet to their lowest point of the fall season so far. Lows are expected to dip into the lower to mid-20s across much of the region.

Frost and freeze conditions are likely, so bring in any sensitive plants and protect outdoor pipes if necessary.