Today | Weather | Monday, April 27, 2026

Weather in McKinney, Texas

08:50 AM
Now
Cloudy Weather
77° F
Feels Like 79°
Precipitation 0 %
Wind 16 mph
UV Index (0 - 11+) 1
Humidity 81 %
Today
Cloudy Weather
Day 91°
Night 73°
Precipitation 5 %
Wind 15 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

57 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 27, 2025)
Cloudy Weather

Day

81°

Night

68°

Wind

12 mph

UV Index

4

Precipitation

25 %

Air Quality in McKinney

NOW
17 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.29 µg/m³
PM10 3.54 µg/m³
O3 0.019 ppm
NO2 1 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 0.92 µg/m³
NO 0.13 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)
PM2.52.29 µg/m³
PM103.54 µg/m³
O336.8 µg/m³
NO21.91 µg/m³
SO20.24 µg/m³
CO132.78 µg/m³
NH30.92 µg/m³
NO0.13 µg/m³