Today | Weather | Thursday, May 21, 2026

Weather in Allen, Texas

04:07 AM
Now
Cloudy Weather
68° F
Feels Like 68°
Precipitation 6 %
Wind 6 mph
Humidity 91 %
Today
Stormy Weather
Day 77°
Night 66°
Precipitation 99 %
Wind 7 mph
UV Index (0 - 11+) 3

Allen Weather Forecast Updated

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

Day

91°

Night

66°

Wind

9 mph

UV Index

11

Precipitation

1 %

Air Quality in Allen

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

Pollutant Concentrations:

PM2.5 3.61 µg/m³
PM10 4.02 µg/m³
O3 0.010 ppm
NO2 2.2 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 1.26 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.53.61 µg/m³
PM104.02 µg/m³
O320.01 µg/m³
NO24.06 µg/m³
SO20.27 µg/m³
CO128.58 µg/m³
NH31.26 µg/m³
NO0 µg/m³