Today | Weather | Thursday, September 18, 2025

Active Weather Warnings

Air Quality Alert

Weather in Houston, Texas

03:38 PM

Now

88° F

Feels Like 93°

Precipitation 38 %

Wind 7 mph

UV Index (0 - 11+) 11

Humidity 53 %

Today

Day 90°

Night 72°

Precipitation 49 %

Wind 8

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Houston Weather Forecast Updated

19 minutes ago

Last updated on September 18, 2025 3:18 PM

Weather Forecast History

Last Year's Weather on This Day (September 18, 2024)

Day

95°

Night

79°

Wind

4 mph

UV Index

Precipitation

Air quality in Houston

NOW

65 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 21.17 µg/m³

PM10 50.40 µg/m³

O₃ 69.33 ppb

NO₂ 12.22 ppb

SO₂ 1.53 ppb

CO 299.40 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Houston

Air Quality Alert

Air Quality Alert issued September 17 at 2:00PM CDT by NWS Houston/Galveston TX

Sep 17, 2:00 PM → Sep 18, 6:00 PM

AQAHGX

The Texas Commission on Environmental Quality (TCEQ) has issued an
Ozone Action Day for the Houston, Galveston, and Brazoria area for
Thursday, September 18, 2025.

Atmospheric conditions are expected to be favorable for producing
high levels of ozone pollution in the Houston, Galveston, and
surrounding areas on Thursday. You can help prevent ozone pollution by
sharing a ride, walking, riding a bicycle, taking your lunch to work,
avoiding drive through lanes, conserving energy and keeping your vehicle
properly tuned.

For more information on ozone:
Ozone: The Facts www.tceq.texas.gov/airquality/monops/ozonefacts.html
EPA AirNow: www.airnow.gov/?city=Houston&state=TX&country=USA
Take Care of Texas:
www.takecareoftexas.org/conservation-tips/keep-our-air-clean

Updated: Sep 18, 3:18 PM Source: NWS Alert