Today | Weather | Tuesday, June 30, 2026

Weather in McKinney, Texas

04:29 PM
Now
Cloudy Weather
93° F
Feels Like 99°
Precipitation 0 %
Wind 14 mph
UV Index (0 - 11+) 5
Humidity 44 %
Today
Cloudy Weather
Day 95°
Night 77°
Precipitation 25 %
Wind 14 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

McKinney Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (June 30, 2025)
Cloudy Weather

Day

97°

Night

73°

Wind

9 mph

UV Index

12

Precipitation

25 %

Air Quality in McKinney

NOW
25 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.4 µg/m³
PM10 3.37 µg/m³
O3 0.027 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.08 ppm
NH3 0.34 µg/m³
NO 0.11 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)
PM2.51.4 µg/m³
PM103.37 µg/m³
O353.2 µg/m³
NO20.4 µg/m³
SO20.27 µg/m³
CO94.86 µg/m³
NH30.34 µg/m³
NO0.11 µg/m³