Today | Weather | Tuesday, September 22, 2026

Active Weather Warnings

Air Quality Alert

Weather in McKinney, Texas

12:44 PM

Now

90° F

Feels Like 97°

Precipitation 0 %

Wind 9 mph

UV Index (0 - 11+) 7

Humidity 52 %

Today

Day 93°

Night 72°

Precipitation 5 %

Wind 7 mph

UV Index (0 - 11+) 7

McKinney Weather Forecast Updated

Last updated on September 22, 2026 at 11:43 AM

Weather Forecast History

Last Year's Weather on This Day (September 22, 2025)

Day

91°

Night

75°

Wind

9 mph

Precipitation

4 %

Air Quality in McKinney

NOW

58 AQI

Moderate air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 9.18 µg/m³

PM₁₀ 11.17 µg/m³

O₃ 0.057 ppm

NO₂ 0.9 ppb

SO₂ 0.6 ppb

CO 0.12 ppm

NH₃ 0.45 µg/m³

NO 0.27 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 – 9.18 µg/m³

PM₁₀ – 11.17 µg/m³

O₃ – 110.97 µg/m³

NO₂ – 1.76 µg/m³

SO₂ – 1.54 µg/m³

CO – 140.65 µg/m³

NH₃ – 0.45 µg/m³

NO – 0.27 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for McKinney

Air Quality Alert

Air Quality Alert issued September 21 at 3:02PM CDT by NWS Fort Worth TX

Sep 21, 3:02 PM → Sep 22, 6:15 PM

AQAFWD

The Texas Commission on Environmental Quality (TCEQ) has issued
an Ozone Action Day for the Dallas-Fort Worth area for Tuesday,
September 22, 2026.

Atmospheric conditions are expected to be favorable for producing
high levels of ozone air pollution in the Dallas-Fort Worth area
on Tuesday. 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: Sep 22, 11:43 AM Source: NWS Alert