Today | Weather | Sunday, August 23, 2026

Weather in McKinney, Texas

07:57 PM
Now
Cloudy Weather
100° F
Feels Like 97°
Precipitation 0 %
Wind 10 mph
UV Index (0 - 11+) 0
Humidity 29 %
Today
Cloudy Weather
Day 108°
Night 82°
Precipitation 2 %
Wind 9 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

McKinney Weather Forecast Updated

Weather Forecast History
Last Year's Weather on This Day (August 23, 2025)
Night

Day

97°

Night

72°

Wind

4 mph

Precipitation

4 %

Air Quality in McKinney

NOW
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.51 µg/m³
PM10 4.67 µg/m³
O3 0.045 ppm
NO2 0.7 ppb
SO2 0.2 ppb
CO 0.08 ppm
NH3 0.66 µg/m³
NO 0.01 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)
PM2.53.51 µg/m³
PM104.67 µg/m³
O388.7 µg/m³
NO21.31 µg/m³
SO20.44 µg/m³
CO96.44 µg/m³
NH30.66 µg/m³
NO0.01 µg/m³