Today | Weather | Wednesday, August 12, 2026
Active Weather Warnings

Weather in Mount Pleasant, South Carolina

07:48 AM
Now
Cloudy Weather
79° F
Feels Like 86°
Precipitation 17 %
Wind 7 mph
UV Index (0 - 11+) 2
Humidity 85 %
Today
Sunny with a Chance of Thunderstorms
Day 97°
Night 77°
Precipitation 55 %
Wind 7 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Mount Pleasant Weather Forecast Updated

35 minutes ago
Last updated on

Air Quality in Mount Pleasant

NOW
19 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.04 µg/m³
PM10 4.48 µg/m³
O3 0.020 ppm
NO2 1 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0.28 µg/m³
NO 0.05 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.53.04 µg/m³
PM104.48 µg/m³
O339.29 µg/m³
NO21.97 µg/m³
SO20.6 µg/m³
CO108.96 µg/m³
NH30.28 µg/m³
NO0.05 µg/m³

Weather Alerts and Warnings for Mount Pleasant

Moderate Expected Likely

Heat Advisory

Heat Advisory issued August 12 at 6:45AM EDT until August 12 at 8:00PM EDT by NWS Charleston SC
Aug 12, 11:00 AM Aug 12, 8:00 PM
WHAT: For the Heat Advisory, heat index values up to 110 expected.
For the Extreme Heat Watch, dangerously hot conditions with heat
index values up to 115 possible.

WHERE: Portions of southeast Georgia and southeast South Carolina.

WHEN: For the Heat Advisory, from 11 AM this morning to 8 PM EDT
this evening. For the Extreme Heat Watch, from Thursday morning
through Thursday evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events. Hot temperatures and high
humidity may cause heat illnesses.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Updated: Aug 12, 7:13 AM Source: NWS Alert