Today | Weather | Saturday, September 19, 2026

Weather in McKinney, Texas

03:47 AM
Now
Night
73° F
Feels Like 73°
Precipitation 0 %
Wind 6 mph
Humidity 71 %
Today
Sunny Weather
Day 97°
Night 73°
Precipitation 2 %
Wind 9 mph
UV Index (0 - 11+) 7

McKinney Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 19, 2025)
Cloudy Night

Day

95°

Night

70°

Wind

5 mph

Precipitation

2 %

Air Quality in McKinney

NOW
52 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.03 µg/m³
PM10 10.54 µg/m³
O3 0.055 ppm
NO2 0.7 ppb
SO2 0.7 ppb
CO 0.12 ppm
NH3 0.63 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 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)
PM2.58.03 µg/m³
PM1010.54 µg/m³
O3107.56 µg/m³
NO21.32 µg/m³
SO21.96 µg/m³
CO134.32 µg/m³
NH30.63 µg/m³
NO0 µg/m³