August 2026 Heat Wave Brought Extreme Heat and Storm Risks to Horry County

Earlier this month, a multi-day heat wave brought extreme weather conditions to Horry and Georgetown counties. On Aug. 11, 2026, the National Weather Service issued heat advisories across the Grand Strand as high humidity and broad upper-level high pressure combined to drive heat index values well into triple digits. Peak heat indexes reached between 105 and 110 degrees, with local recordings topping 112 degrees.

The persistent conditions led to a surge in local health and infrastructure strain. Hospitals across Horry County, including the McLeod Loris Emergency Department, reported an increase in heat-related visits, primarily for dehydration. The extreme heat particularly impacted outdoor workers in construction, landscaping, and postal delivery services, as well as residents attending scheduled outdoor events, political rallies, and early voting sites in Myrtle Beach.

While afternoon severe thunderstorms brought temporary temperature drops, experts noted that precipitation added moisture back into the air, causing humidity levels and dew points to remain high once storms passed. Ground conditions also presented hazards, as heavy rain falling at rates up to four to five inches per hour ran off dry soil, leading to localized flash flooding risks in low-lying areas, along Highway 501, and in Socastee.

The prolonged event highlighted the cumulative health risks of high heat index values when overnight low temperatures fail to cool significantly. Public health officials recommend that residents in the Grand Strand area continue to monitor weather forecasts, stay hydrated, limit outdoor exertion during peak afternoon hours, and check on vulnerable neighbors and outdoor workers during periods of extreme heat.