South Carolina is gearing up for its 250th Independence Day, but a looming heat wave may dim the celebrations.

Charleston’s forecast calls for highs around 94 degrees on July 4, with a heat dome rolling in that could raise temperatures further.

When the heat index climbs to 108 degrees, officials can issue a heat advisory; this is close to what the National Weather Service expects for the coming weekend.

Even though afternoon storms might bring brief relief, nights are expected to stay warm—an overnight low near 81 degrees would break the city’s 1959 and 2016 record of 79.

Inland areas, lacking the cooling sea breeze, may see mid‑90s highs and heat indices reaching 110 degrees, while the Upstate could stay in the upper 90s with high humidity.

The heat dome is linked to a strong El Niño over the Pacific, a pattern that historically raises temperatures in South Carolina and reduces Atlantic hurricane activity.

Scientists warn that this combination of El Niño, global warming and a 1. 5‑degree Celsius threshold could intensify heat across the planet.

Residents are urged to stay hydrated, use air conditioning when possible, and avoid outdoor activities during peak heat.


# South Carolina Prepares for 250th Independence Day Amid Heat Wave

**Charleston**  
- **July 4 highs:** ~94°F (heat dome may push higher)  
- **Heat index:** 108°F → *heat advisory* likely  

**Weather Outlook**  
- Afternoon storms could offer brief relief, but nighttime temperatures will remain high.  
  - Overnight lows near **81°F** would break the city’s 1959 & 2016 record of 79°F.  

**Inland Areas**  
- Mid‑90s highs, heat indices up to **110°F**.  

**Upstate**  
- Upper 90s with high humidity, staying warm through the night.  

**Underlying Causes**  
- A strong **El Niño** over the Pacific is driving the heat dome.  
  - Historically raises temperatures in South Carolina and suppresses Atlantic hurricane activity.  
- Scientists warn that the combination of El Niño, global warming, and a 1.5‑°C threshold could intensify heat worldwide.

**Public Advisory**  
- Stay hydrated.  
- Use air conditioning when possible.  
- Avoid outdoor activities during peak heat.



Heat Wave Hits July 4 in South Carolina

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