Today | Weather | Wednesday, May 20, 2026

Weather in McKinney, Texas

08:20 PM
Now
Cloudy Weather
79° F
Feels Like 79°
Precipitation 7 %
Wind 5 mph
UV Index (0 - 11+) 0
Humidity 68 %
Today
Cloudy Weather
Day 81°
Night 66°
Precipitation 25 %
Wind 6 mph

McKinney Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 20, 2025)
Sunny Weather

Day

82°

Night

57°

Wind

14 mph

UV Index

11

Precipitation

0 %

Air Quality in McKinney

NOW
25 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.38 µg/m³
PM10 3.78 µg/m³
O3 0.027 ppm
NO2 1.5 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0.91 µg/m³
NO 0.03 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)
PM2.53.38 µg/m³
PM103.78 µg/m³
O353 µg/m³
NO22.86 µg/m³
SO20.56 µg/m³
CO119.47 µg/m³
NH30.91 µg/m³
NO0.03 µg/m³