Today | Weather | Thursday, September 18, 2025

Active Weather Warnings

Air Quality Alert

Weather in Pittsburgh, Pennsylvania

01:13 AM

Now

61° F

Feels Like 63°

Precipitation 0 %

Wind 4 mph

Humidity 78 %

Today

Day 88°

Night 57°

Precipitation 0 %

Wind 10

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.

Pittsburgh Weather Forecast Updated

17 minutes ago

Last updated on September 18, 2025 12:56 AM

Weather Forecast History

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

Day

77°

Night

64°

Wind

4 mph

UV Index

Precipitation

Air quality in Pittsburgh

NOW

59 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 17.23 µg/m³

PM10 17.45 µg/m³

O₃ 17.46 ppb

NO₂ 22.93 ppb

SO₂ 2.71 ppb

CO 363.00 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 Pittsburgh

Air Quality Alert

Air Quality Alert issued September 17 at 4:30PM EDT by NWS Pittsburgh PA

Sep 17, 4:30 PM → Sep 18, 4:00 PM

The Pennsylvania Department of Environmental Protection has
issued a code ORANGE air quality alert for Thursday, including
the greater Pittsburgh region, including Allegheny, Butler,
Beaver, Armstrong, Washington, Westmoreland and Fayette counties.

A code ORANGE air quality alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, the elderly,
and people suffering from asthma, heart disease, or other lung
diseases. The effects of air pollution can be minimized by
avoiding outdoor exercise or strenuous activity.

For more information on ground-level ozone and
fine particles, visit http://www.airnow.gov and
https://www.ahs.dep.pa.gov/AQPartnersWeb/

Updated: Sep 18, 12:56 AM Source: NWS Alert