Today | Weather | Wednesday, October 21, 2026

Active Weather Warnings

Air Quality Alert

Weather in McKinney, Texas

03:19 AM

Now

52° F

Feels Like 52°

Precipitation 0 %

Wind 4 mph

Humidity 82 %

Today

Day 81°

Night 50°

Precipitation 0 %

Wind 5 mph

UV Index (0 - 11+) 4

McKinney Weather Forecast Updated

7 minutes ago

Last updated on October 21, 2026 at 3:11 AM

Weather Forecast History

Last Year's Weather on This Day (October 21, 2025)

Day

90°

Night

48°

Wind

2 mph

Precipitation

0 %

Air Quality in McKinney

NOW

24 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 5.87 µg/m³

PM₁₀ 6.76 µg/m³

O₃ 0.026 ppm

NO₂ 2.9 ppb

SO₂ 0.3 ppb

CO 0.14 ppm

NH₃ 1.52 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 5.87 µg/m³

PM₁₀ – 6.76 µg/m³

O₃ – 50.53 µg/m³

NO₂ – 5.39 µg/m³

SO₂ – 0.76 µg/m³

CO – 158.76 µg/m³

NH₃ – 1.52 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for McKinney

Air Quality Alert

Air Quality Alert issued October 20 at 3:19PM CDT by NWS Fort Worth TX

Oct 20, 3:19 PM → Oct 21, 6:30 PM

AQAFWD

The Texas Commission on Environmental Quality (TCEQ) has issued
an Ozone Action Day for the Dallas-Fort Worth area for Wednesday,
October 21, 2026.

Atmospheric conditions are expected to be favorable for producing
high levels of ozone air pollution in the Dallas-Fort Worth area
on Wednesday. You can help prevent ozone pollution by sharing a
ride, walking, riding a bicycle, taking your lunch to work,
avoiding drive-through lanes, conserving energy, and keeping your
vehicle properly tuned.

For more information on ozone:

Ozone: The Facts (www.tceq.texas.gov/goto/ozonefacts)

Air North Texas: (www.airnorthtexas.org)

EPA Air Now
(www.airnow.gov/index.cfm?action.local_state&STATEID=45&TAB=0)

Take care of Texas (www.takecareoftexas.org)

North Central Texas Council of Governments Air Quality
(www.nctcog.org/trans/air/index.asp)

Updated: Oct 21, 3:11 AM Source: NWS Alert