Today | Weather | Thursday, May 21, 2026

Weather in Richardson, Texas

11:46 AM
Now
Cloudy Weather
77° F
Feels Like 81°
Precipitation 46 %
Wind 7 mph
UV Index (0 - 11+) 3
Humidity 70 %
Today
Stormy Weather
Day 77°
Night 66°
Precipitation 96 %
Wind 7 mph
UV Index (0 - 11+) 3

Richardson Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Cloudy Weather

Day

93°

Night

68°

Wind

8 mph

UV Index

11

Precipitation

1 %

Air Quality in Richardson

NOW
23 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.11 µg/m³
PM10 4.76 µg/m³
O3 0.025 ppm
NO2 0.9 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0.51 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)
PM2.54.11 µg/m³
PM104.76 µg/m³
O348.51 µg/m³
NO21.68 µg/m³
SO20.54 µg/m³
CO111.2 µg/m³
NH30.51 µg/m³
NO0.11 µg/m³