Hourly Weather Forecast for Mount Pleasant, South Carolina

Hourly Weather | Today › Wednesday, August 12, 2026

Active Weather Warnings

Heat Advisory

Mount Pleasant, South Carolina

9 AM

81°

Feels Like 93°

Humidity: 83%

UV Index: 3

Wind: 7 mph

10 AM

84°

Feels Like 99°

Humidity: 76%

UV Index: 4

Wind: 7 mph

11 AM

88°

Feels Like 104°

Humidity: 71%

UV Index: 7

Wind: 7 mph

12 PM

90°

Feels Like 108°

Humidity: 66%

UV Index: 9

Wind: 7 mph

1 PM

91°

Feels Like 109°

Humidity: 61%

UV Index: 10

Wind: 7 mph

2 PM

93°

Feels Like 111°

Humidity: 57%

UV Index: 9

Wind: 7 mph

3 PM

97°

Feels Like 111°

Humidity: 54%

UV Index: 7

Wind: 7 mph

4 PM

95°

Feels Like 108°

Humidity: 56%

UV Index: 4

Wind: 8 mph

5 PM

93°

Feels Like 106°

Humidity: 58%

UV Index: 3

Wind: 8 mph

6 PM

91°

Feels Like 104°

Humidity: 62%

UV Index: 1

Wind: 8 mph

7 PM

90°

Feels Like 99°

Humidity: 70%

UV Index: 0

Wind: 8 mph

8 PM

88°

Feels Like 97°

Humidity: 77%

UV Index: 0

Wind: 8 mph

9 PM

84°

Feels Like 97°

Humidity: 82%

UV Index: 0

Wind: 7 mph

10 PM

82°

Feels Like 95°

Humidity: 86%

UV Index: 0

Wind: 7 mph

11 PM

82°

Feels Like 93°

Humidity: 86%

UV Index: 0

Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

9 AM

18 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.23 µg/m³
PM₁₀: 4.72 µg/m³
O₃: 0.020 ppm
NO₂: 1 ppb
SO₂: 0.2 ppb
CO: 0.10 ppm

Health Recommendations:

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

10 AM

20 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.46 µg/m³
PM₁₀: 4.99 µg/m³
O₃: 0.022 ppm
NO₂: 0.8 ppb
SO₂: 0.2 ppb
CO: 0.10 ppm

Health Recommendations:

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

11 AM

24 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.92 µg/m³
PM₁₀: 5.47 µg/m³
O₃: 0.026 ppm
NO₂: 0.7 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

12 PM

29 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.7 µg/m³
PM₁₀: 6.34 µg/m³
O₃: 0.032 ppm
NO₂: 0.5 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

1 PM

33 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.31 µg/m³
PM₁₀: 7.13 µg/m³
O₃: 0.035 ppm
NO₂: 0.5 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

2 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.6 µg/m³
PM₁₀: 7.54 µg/m³
O₃: 0.038 ppm
NO₂: 0.4 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

3 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.57 µg/m³
PM₁₀: 7.55 µg/m³
O₃: 0.040 ppm
NO₂: 0.4 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

4 PM

37 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 5.24 µg/m³
PM₁₀: 7.37 µg/m³
O₃: 0.040 ppm
NO₂: 0.5 ppb
SO₂: 0.2 ppb
CO: 0.10 ppm

Health Recommendations:

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

5 PM

36 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.83 µg/m³
PM₁₀: 7.33 µg/m³
O₃: 0.039 ppm
NO₂: 0.5 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

6 PM

35 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.49 µg/m³
PM₁₀: 7.49 µg/m³
O₃: 0.038 ppm
NO₂: 0.7 ppb
SO₂: 0.3 ppb
CO: 0.10 ppm

Health Recommendations:

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

7 PM

34 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 4.16 µg/m³
PM₁₀: 7.54 µg/m³
O₃: 0.037 ppm
NO₂: 1.1 ppb
SO₂: 0.4 ppb
CO: 0.10 ppm

Health Recommendations:

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

8 PM

31 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.83 µg/m³
PM₁₀: 7.31 µg/m³
O₃: 0.034 ppm
NO₂: 1.4 ppb
SO₂: 0.5 ppb
CO: 0.10 ppm

Health Recommendations:

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

9 PM

28 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.66 µg/m³
PM₁₀: 6.99 µg/m³
O₃: 0.030 ppm
NO₂: 1.6 ppb
SO₂: 0.6 ppb
CO: 0.10 ppm

Health Recommendations:

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

10 PM

26 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.7 µg/m³
PM₁₀: 6.78 µg/m³
O₃: 0.028 ppm
NO₂: 1.7 ppb
SO₂: 0.5 ppb
CO: 0.10 ppm

Health Recommendations:

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

11 PM

24 AQI

Good air quality Dominant pollutant: O₃

Details

Pollutant Concentrations:

PM_2.5: 3.97 µg/m³
PM₁₀: 6.53 µg/m³
O₃: 0.026 ppm
NO₂: 1.6 ppb
SO₂: 0.5 ppb
CO: 0.10 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

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.

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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

Hourly Air Quality Forecast - AQI (US EPA)

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Weather Alerts and Warnings for Mount Pleasant

Heat Advisory

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