Columbia, S.C. – A wave of oppressive heat and humidity will settle over Columbia this week, bringing dangerous heat index values and a persistent threat of afternoon thunderstorms. The combination of heat and storms will create challenging conditions for outdoor work, travel, and holiday activities, beginning Monday and extending through the upcoming weekend.
According to the National Weather Service, heat index values are expected to reach a sweltering 103°F on both Monday and Tuesday. The actual air temperature will climb into the mid-90s each day. Officials urge residents to take precautions against heat-related illness by staying hydrated, taking frequent breaks in the shade or air conditioning, and avoiding strenuous activity during the hottest parts of the afternoon.
The pattern of intense daytime heating will fuel a daily chance for showers and thunderstorms, primarily after 2 p.m. While the probability of rain each day remains around 30%, any storm that develops could produce brief heavy downpours and lightning. This unsettled weather continues into the middle of the week, with a high of 94°F on Tuesday and 95°F on Wednesday.
Heat is expected to peak just in time for the Juneteenth holiday, with a high of 96°F on Thursday. Those planning outdoor celebrations should prepare for the extreme temperatures and have a plan to move indoors if storms develop. The risk of afternoon pop-up storms will linger through Friday and Saturday, with highs remaining in the mid-90s.
The five-day outlook shows a consistent theme of heat and humidity:
- Monday: High 93°F, with a heat index up to 103°F and a chance of afternoon storms.
- Tuesday: High 94°F, feeling like 103°F, with storms possible after 2 p.m.
- Wednesday: High 95°F under sunny skies, with a slight chance of an afternoon shower.
- Thursday (Juneteenth): High 96°F, with a continued risk of afternoon thunderstorms.
- Friday: High 95°F with a 30% chance of storms after 2 p.m.
