Today | Weather | Monday, September 21, 2026

Weather in Mount Pleasant, South Carolina

01:54 PM
Now
Cloudy Weather
88° F
Feels Like 99°
Precipitation 6 %
Wind 8 mph
UV Index (0 - 11+) 6
Humidity 58 %
Today
Cloudy Weather
Day 88°
Night 73°
Precipitation 25 %
Wind 6 mph
UV Index (0 - 11+) 7

Mount Pleasant Weather Forecast Updated

7 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Cloudy Night

Day

82°

Night

70°

Wind

7 mph

Precipitation

7 %

Air Quality in Mount Pleasant

NOW
37 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.94 µg/m³
PM10 4.38 µg/m³
O3 0.040 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0.01 µg/m³
NO 0.1 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)
PM2.51.94 µg/m³
PM104.38 µg/m³
O378.51 µg/m³
NO20.62 µg/m³
SO20.55 µg/m³
CO121.08 µg/m³
NH30.01 µg/m³
NO0.1 µg/m³