Today | Weather | Thursday, May 21, 2026

Weather in McKinney, Texas

10:20 AM
Now
Cloudy Weather
72° F
Feels Like 75°
Precipitation 19 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 85 %
Today
Stormy Weather
Day 75°
Night 66°
Precipitation 96 %
Wind 7 mph
UV Index (0 - 11+) 3

McKinney Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Cloudy Weather

Day

90°

Night

63°

Wind

12 mph

UV Index

11

Precipitation

0 %

Air Quality in McKinney

NOW
19 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 4.45 µg/m³
PM10 5.3 µg/m³
O3 0.013 ppm
NO2 2.1 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0.97 µg/m³
NO 0.31 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)
PM2.54.45 µg/m³
PM105.3 µg/m³
O324.69 µg/m³
NO23.89 µg/m³
SO20.39 µg/m³
CO126.58 µg/m³
NH30.97 µg/m³
NO0.31 µg/m³