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Today | Weather | Thursday, December 4, 2025
Active Weather Warnings

Weather in Mount Pleasant, South Carolina

05:05 AM
Now
Cloudy Night
39° F
Feels Like 37°
Precipitation 0 %
Wind 6 mph
Humidity 87 %
Today
Cloudy Weather
Day 57°
Night 48°
Precipitation 25 %
Wind 6 mph
UV Index (0 - 11+) 3

Mount Pleasant Weather Forecast Updated

Last updated on

Air Quality in Mount Pleasant

NOW
29 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.54 µg/m³
PM10 5.56 µg/m³
O3 0.032 ppm
NO2 1.5 ppb
SO2 0.6 ppb
CO 0.16 ppm
NH3 0.1 µg/m³
NO 0 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)
PM2.5 – 4.54 µg/m³
PM10 – 5.56 µg/m³
O3 – 62.29 µg/m³
NO2 – 2.84 µg/m³
SO2 – 1.53 µg/m³
CO – 178.17 µg/m³
NH3 – 0.1 µg/m³
NO – 0 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Mount Pleasant

Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued December 4 at 12:42AM EST until December 4 at 8:00AM EST by NWS Charleston SC
Dec 4, 5:00 AM → Dec 4, 8:00 AM
WHAT: Up to one half foot of inundation above ground level
expected along shorelines and tidal waterways (7.1 to 7.3 feet
Mean Lower Low Water at Charleston).

WHERE: Coastal Colleton and Charleston Counties.

WHEN: From 5 AM to 8 AM EST this morning.

IMPACTS: This could result in some roads becoming impassable.

ADDITIONAL DETAILS: High tide will occur around 6:47 AM
Thursday at Charleston. Saltwater inundation will be possible
1 to 2 hours before and after high tide.
+ Read More
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Visit water.weather.gov for additional water level and flood impact information.
Updated: Dec 4, 3:27 AM Source: NWS Alert