Today | Weather | Wednesday, March 18, 2026

Weather in Allen, Texas

05:22 AM
Now
Cloudy Night
50° F
Feels Like 41°
Precipitation 0 %
Wind 15 mph
Humidity 42 %
Today
Cloudy Weather
Day 75°
Night 55°
Precipitation 0 %
Wind 14 mph
UV Index (0 - 11+) 6

Allen Weather Forecast Updated

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

Day

82°

Night

61°

Wind

23 mph

UV Index

6

Precipitation

0 %

Air Quality in Allen

NOW
57 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.85 µg/m³
PM10 4.95 µg/m³
O3 0.056 ppm
NO2 0.9 ppb
SO2 0.4 ppb
CO 0.13 ppm
NH3 4.47 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)
PM2.53.85 µg/m³
PM104.95 µg/m³
O3110.23 µg/m³
NO21.74 µg/m³
SO21.08 µg/m³
CO151.64 µg/m³
NH34.47 µg/m³
NO0 µg/m³