Today | Weather | Saturday, September 12, 2026
Active Weather Warnings

Weather in Houston, Texas

09:43 AM
Now
Cloudy Weather
86° F
Feels Like 100°
Precipitation 5 %
Wind 7 mph
UV Index (0 - 11+) 4
Humidity 78 %
Today
Sunny with a Chance of Thunderstorms
Day 95°
Night 77°
Precipitation 70 %
Wind 8 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

14 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 12, 2025)
Night

Day

91°

Night

72°

Wind

6 mph

Precipitation

1 %

Air Quality in Houston

NOW
17 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.37 µg/m³
PM10 10.01 µg/m³
O3 0.018 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 0.07 µg/m³
NO 0.06 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)
PM2.52.37 µg/m³
PM1010.01 µg/m³
O335.46 µg/m³
NO20.32 µg/m³
SO20.28 µg/m³
CO114.57 µg/m³
NH30.07 µg/m³
NO0.06 µg/m³

Weather Alerts and Warnings for Houston

Moderate Expected Likely

Heat Advisory

Heat Advisory issued September 12 at 12:20AM CDT until September 12 at 6:00PM CDT by NWS Houston/Galveston TX
Sep 12, 12:00 PM Sep 12, 6:00 PM
WHAT: Heat index values up to 109 expected.

WHERE: Portions of south central and southeast Texas.

WHEN: From noon today to 6 PM CDT this evening.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Updated: Sep 12, 9:29 AM Source: NWS Alert