Illinois – Crisp air bites early across central Illinois as temperatures sit in the upper 20s around Lincoln and Champaign. Frost clings to windshields, and the ground feels firm underfoot, a familiar winter scene as the first full week of 2026 begins to unfold.
According to the National Weather Service, skies turn partly sunny today with highs climbing into the upper 30s. Light winds help ease the chill, but shaded roads and sidewalks may remain slick during the morning hours. Drivers should use caution on bridges and untreated surfaces where frost lingers.
The real shift arrives quickly. By Monday, southerly winds strengthen and push temperatures toward the upper 40s. Tuesday accelerates the warming trend, with highs reaching the mid-50s across much of central Illinois. The jump from freezing mornings to mild afternoons creates noticeable thawing, and winter layers may feel unnecessary by midday.
This warm-to-cold swing carries a familiar risk. As daytime melting increases, refreezing can occur after sunset when temperatures dip back near freezing. That raises the potential for black ice, especially on secondary roads and parking lots. Plan extra time during early commutes.
Midweek stays mild and mostly sunny, keeping highs in the low to mid-50s. By Thursday, clouds thicken and rain chances increase. Showers may develop by afternoon, bringing wet pavement and reduced visibility during evening travel. While snow is not expected locally this week, colder air later in January could reopen that door.
This pattern mirrors a broader Midwest trend. Warmer-than-average air dominates early January before winter reasserts itself later in the month, especially near the Great Lakes. For now, the focus remains on rapid temperature changes and changing road conditions.
Five-Day Outlook for Lincoln / Champaign, IL
- Today: Partly sunny, cold, high near 37°F
- Monday: Partly sunny, milder, high near 48°F
- Tuesday: Partly sunny, warm, high near 56°F
- Wednesday: Mostly sunny, high near 54°F
- Thursday: Increasing clouds, chance of rain, high near 55°F
