Today | Weather | Friday, September 11, 2026

Weather in McKinney, Texas

02:26 AM
Now
Cloudy Night
79° F
Feels Like 81°
Precipitation 34 %
Wind 8 mph
Humidity 80 %
Today
Sunny with a Chance of Thunderstorms
Day 95°
Night 79°
Precipitation 55 %
Wind 8 mph
UV Index (0 - 11+) 7

McKinney Weather Forecast Updated

17 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 11, 2025)
Cloudy Night

Day

93°

Night

68°

Wind

4 mph

Precipitation

49 %

Air Quality in McKinney

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.91 µg/m³
PM10 1.32 µg/m³
O3 0.026 ppm
NO2 1.3 ppb
SO2 0.3 ppb
CO 0.10 ppm
NH3 0.5 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)
PM2.50.91 µg/m³
PM101.32 µg/m³
O351.29 µg/m³
NO22.36 µg/m³
SO20.77 µg/m³
CO111.89 µg/m³
NH30.5 µg/m³
NO0 µg/m³