Today | Weather | Sunday, August 30, 2026

Weather in McKinney, Texas

12:11 AM
Now
Night
84° F
Feels Like 84°
Precipitation 0 %
Wind 8 mph
Humidity 54 %
Today
Sunny Weather
Day 100°
Night 77°
Precipitation 2 %
Wind 10 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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

41 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 30, 2025)
Stormy Weather

Day

79°

Night

72°

Wind

5 mph

Precipitation

90 %

Air Quality in McKinney

NOW
38 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.44 µg/m³
PM10 3.88 µg/m³
O3 0.042 ppm
NO2 0.9 ppb
SO2 0.4 ppb
CO 0.10 ppm
NH3 1.16 µg/m³
NO 0 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)
PM2.53.44 µg/m³
PM103.88 µg/m³
O381.51 µg/m³
NO21.74 µg/m³
SO20.92 µg/m³
CO117.89 µg/m³
NH31.16 µg/m³
NO0 µg/m³