Today | Weather | Monday, September 21, 2026

Weather in Houston, Texas

01:33 PM
Now
Cloudy Weather
93° F
Feels Like 106°
Precipitation 34 %
Wind 6 mph
UV Index (0 - 11+) 7
Humidity 50 %
Today
Sunny with a Chance of Thunderstorms
Day 95°
Night 79°
Precipitation 55 %
Wind 5 mph
UV Index (0 - 11+) 7

Houston Weather Forecast Updated

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

Day

88°

Night

75°

Wind

6 mph

Precipitation

40 %

Air Quality in Houston

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.4 µg/m³
PM10 3.23 µg/m³
O3 0.039 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 0.04 µg/m³
NO 0.05 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)
PM2.51.4 µg/m³
PM103.23 µg/m³
O376.63 µg/m³
NO20.39 µg/m³
SO20.24 µg/m³
CO116.48 µg/m³
NH30.04 µg/m³
NO0.05 µg/m³