Cold Air Damming Has Cooled South Carolina

A wedge pattern has trapped cooler air across inland regions while coastal temperatures remain warmer.

Updated on Sept. 23, 2026 in Current Conditions

Isometric editorial illustration showing a dense mountain ridge in the west with a cool air layer pooled against the slopes. — A cold air damming event has caused a sharp temperature divide in South Carolina, trapping cooler air in inland regions while coastal areas remain warmer. AI Illustration. Upload story photo >

Cold air damming has created a significant temperature divide across South Carolina as a high-pressure system settles north of the Carolinas. This meteorological wedge effect keeps inland areas noticeably cooler than the Grand Strand.

Why it matters

The wedge pattern traps cooler, dense air against the mountains to the west, leading to temperatures that remain below the typical average for late September. Residents in inland communities are feeling the impact of this persistent northeast wind pattern.

Grand Strand temperatures are reaching 80 degrees, while inland areas are holding in the low to mid 70s. Overnight low temperatures across the state are currently dipping into the 60s.

The players

Grand Strand

This coastal region serves as the warmer reference point in the current South Carolina weather pattern.

The details

Cold high pressure positioned north of the Carolinas is driving a northeast wind that forces cooler air to pool against the western mountains. This phenomenon effectively separates inland temperatures from the warmer, coastal air found along the Grand Strand.

September 23, 2026: Inland temperatures are cooler than the coast.
September 24, 2026: The wedge pattern remains in place.
September 25, 2026: Conditions improve as the wedge breaks down.

Seasonal Patterns

This weather event follows the classic behavior of the Carolina cold air damming wedge pattern. It represents a seasonal shift where high pressure north of the region disrupts typical temperature gradients.

Residents in inland communities should prepare for continued cooler temperatures through Thursday. Those traveling toward the coast can expect warmer conditions with highs reaching 80 degrees.

The takeaway

The persistent wedge pattern highlights how geographical features like the mountains can dictate local climate variations. Residents should plan for below-average temperatures until the high-pressure system moves out of the region on Friday.