Today | Weather | Tuesday, April 21, 2026

Weather in Houston, Texas

12:12 AM
Now
Cloudy Weather
64° F
Feels Like 64°
Precipitation 49 %
Wind 7 mph
Humidity 94 %
Today
Stormy Weather
Day 68°
Night 64°
Precipitation 99 %
Wind 9 mph
UV Index (0 - 11+) 3

Houston Weather Forecast Updated

46 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 21, 2025)
Sunny with a Chance of Thunderstorms

Day

84°

Night

70°

Wind

8 mph

UV Index

11

Precipitation

70 %

Air Quality in Houston

NOW
71 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.72 µg/m³
PM10 8.06 µg/m³
O3 0.061 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0.83 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)
PM2.53.72 µg/m³
PM108.06 µg/m³
O3119.09 µg/m³
NO20.64 µg/m³
SO20.43 µg/m³
CO126.26 µg/m³
NH30.83 µg/m³
NO0 µg/m³