Columbia, South Carolina – A push of Arctic air is expected to reach South Carolina between Jan. 18 and Jan. 22, bringing a notable shift toward colder-than-normal temperatures as a clipper system helps drive a broader pattern change across the eastern United States.
According to the Climate Prediction Center’s 6–10 day temperature outlook, South Carolina is favored to experience below-normal temperatures during this period as a deep upper-level trough settles over the eastern half of the country. This colder pattern follows the end of a recent mild stretch, driven by strong ridging across the western U.S. and Alaska that allows colder air to spill southward.
Daytime high temperatures are expected to trend several degrees below mid-January averages, while overnight lows fall more noticeably across inland and rural areas. Although South Carolina typically avoids the harshest Arctic impacts, increasing winds behind the passing clipper system could still lead to chillier morning conditions, particularly during the early morning hours.
At this time, precipitation chances are expected to remain near normal for this time of year. Forecast guidance does not indicate a strong signal for widespread rain or wintry precipitation during the Jan. 18–22 window, as the incoming Arctic air mass is expected to be relatively dry. Any precipitation that does occur would likely be light and brief, associated with fast-moving systems.
For South Carolina commuters, students, and outdoor workers, the primary impacts during this period will be cooler daytime temperatures, colder nights, and increased heating demand, rather than travel disruptions. Residents are encouraged to monitor forecast updates as temperature details and wind impacts become clearer closer to the event.
