Today | Weather | Tuesday, September 23, 2025

Weather in McKinney, Texas

03:20 AM
Now
Night
79° F
Feels Like 82°
Precipitation 0 %
Wind 10 mph
Humidity 82 %
Today
Cloudy Weather
Day 95°
Night 72°
Precipitation 25 %
Wind 21
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 (September 23, 2024)

Cloudy Night

Day

93°

Night

64°

Wind

4 mph

Precipitation

18

Air quality in McKinney

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

Pollutant Concentrations:

PM2.5 5.68 µg/m³
PM10 6.33 µg/m³
O₃ 33.99 ppb
NO₂ 4.78 ppb
SO₂ 0.78 ppb
CO 130.19 ppb
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide

Health Recommendations:

With this level of air quality, you have no limitations. Enjoy the outdoors