Extreme Heat Warning Issued Across Grand Strand and Coastal Region

An Extreme Heat Warning was issued for Horry, Georgetown, Brunswick, and Williamsburg counties on Tuesday, August 18, 2026, as high temperatures combined with extreme humidity to produce some of the hottest conditions of the summer. Neighboring areas, including Marion and Florence counties, were placed under Heat Advisories during the same period.

Along the Grand Strand beaches, daytime temperatures reached the lower to middle 90s, while inland areas climbed into the upper 90s. When factoring in the intense humidity, heat index values in the warning zones reached between 110 and 115 degrees. Inland areas under the Heat Advisory saw heat index values peak between 105 and 110 degrees.

The extreme weather conditions impacted outdoor workers, residents, afternoon commuters, and summer visitors across North Myrtle Beach and surrounding coastal communities. Weather officials urged everyone in the region to limit strenuous outdoor activities during the peak heat hours between 12 p.m. and 6 p.m., seek shade or air conditioning, and drink plenty of water. Special care was recommended for children, seniors, and pets to prevent heat-related illness.

Elevated heat conditions are expected to persist across the region through mid-week, with heat alerts likely continuing through Wednesday and Thursday. Highs will remain in the lower 90s along the coast and in the upper 90s inland.

Relief is anticipated heading into the weekend as a weak front moves into the area. This system will bring scattered afternoon and evening thunderstorms starting Friday, helping to slightly lower temperatures, though conditions will remain warm and humid.