Today | Weather | Wednesday, March 18, 2026

Active Weather Warnings

Freeze Warning

Weather in Mount Pleasant, South Carolina

04:04 AM

Now

37° F

Feels Like 32°

Precipitation 0 %

Wind 8 mph

Humidity 62 %

Today

Day 57°

Night 43°

Precipitation 1 %

Wind 9 mph

UV Index (0 - 11+) 6

Mount Pleasant Weather Forecast Updated

Last updated on March 18, 2026 at 2:46 AM

Air Quality in Mount Pleasant

NOW

73 AQI

Moderate air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 2.27 µg/m³

PM₁₀ 3.64 µg/m³

O₃ 0.061 ppm

NO₂ 0.6 ppb

SO₂ 0.5 ppb

CO 0.13 ppm

NH₃ 1.05 µg/m³

NO 0 µg/m³

PM_2.5 – 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 2.27 µg/m³

PM₁₀ – 3.64 µg/m³

O₃ – 120.46 µg/m³

NO₂ – 1.13 µg/m³

SO₂ – 1.36 µg/m³

CO – 148.68 µg/m³

NH₃ – 1.05 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Mount Pleasant

Moderate Expected Likely

Freeze Warning

Freeze Warning issued March 18 at 1:27AM EDT until March 18 at 10:00AM EDT by NWS Charleston SC

Mar 18, 1:27 AM → Mar 18, 10:00 AM

WHAT: Sub-freezing temperatures as low as 28 expected.

WHERE: Portions of southeast Georgia and southeast South Carolina.

WHEN: Until 10 AM EDT this morning.

IMPACTS: Frost and freeze conditions could kill crops, other
sensitive vegetation and possibly damage unprotected outdoor
plumbing.

+ Read More

Take steps now to protect tender plants from the cold.

Updated: Mar 18, 2:46 AM Source: NWS Alert