Today | Weather | Friday, September 18, 2026

Weather in Houston, Texas

04:41 AM
Now
Cloudy Night
75° F
Feels Like 84°
Precipitation 0 %
Wind 5 mph
Humidity 96 %
Today
Cloudy Weather
Day 97°
Night 73°
Precipitation 25 %
Wind 7 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Houston Weather Forecast Updated

6 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Cloudy Night

Day

90°

Night

73°

Wind

6 mph

Precipitation

25 %

Air Quality in Houston

NOW
31 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.37 µg/m³
PM10 6.56 µg/m³
O3 0.034 ppm
NO2 0.6 ppb
SO2 0.1 ppb
CO 0.12 ppm
NH3 0.26 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)
PM2.53.37 µg/m³
PM106.56 µg/m³
O366.78 µg/m³
NO21.18 µg/m³
SO20.28 µg/m³
CO138.02 µg/m³
NH30.26 µg/m³
NO0 µg/m³