Today | Weather | Wednesday, March 18, 2026

Weather in McKinney, Texas

01:21 AM
Now
Cloudy Night
48° F
Feels Like 41°
Precipitation 0 %
Wind 14 mph
Humidity 44 %
Today
Cloudy Weather
Day 75°
Night 52°
Precipitation 0 %
Wind 15 mph
UV Index (0 - 11+) 6

McKinney Weather Forecast Updated

36 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Windy Weather

Day

82°

Night

59°

Wind

27 mph

UV Index

6

Precipitation

0 %

Air Quality in McKinney

NOW
69 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.78 µg/m³
PM10 3.79 µg/m³
O3 0.060 ppm
NO2 1.2 ppb
SO2 0.5 ppb
CO 0.13 ppm
NH3 4.17 µg/m³
NO 0 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.52.78 µg/m³
PM103.79 µg/m³
O3117.71 µg/m³
NO22.19 µg/m³
SO21.32 µg/m³
CO150.11 µg/m³
NH34.17 µg/m³
NO0 µg/m³