Charleston is bracing for temperatures that could set new record highs today, giving the Lowcountry a late blast of summer-like heat. The warm spell is expected to be short-lived as cooler air moves in ahead of the weekend. Residents planning outdoor activities should plan around the peak afternoon heat and stay hydrated. Forecasters say the shift to cooler weather will bring a noticeable change in comfort levels. Check local forecasts for timing as the temperature swing takes hold.