Today | Weather | Saturday, July 18, 2026
Active Weather Warnings

Weather in Philadelphia, Pennsylvania

11:20 AM
Now
Stormy Weather
81° F
Feels Like 84°
Precipitation 74 %
Wind 7 mph
UV Index (0 - 11+) 2
Humidity 76 %
Today
Stormy Weather
Day 82°
Night 75°
Precipitation 98 %
Wind 7 mph
UV Index (0 - 11+) 2

Philadelphia Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 18, 2025)
Cloudy Weather

Day

86°

Night

73°

Wind

7 mph

UV Index

7

Precipitation

25 %

Air Quality in Philadelphia

NOW
91 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 31.11 µg/m³
PM10 36.9 µg/m³
O3 0.045 ppm
NO2 0.9 ppb
SO2 0.4 ppb
CO 0.21 ppm
NH3 3 µg/m³
NO 0.17 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.531.11 µg/m³
PM1036.9 µg/m³
O387.77 µg/m³
NO21.73 µg/m³
SO20.96 µg/m³
CO240.82 µg/m³
NH33 µg/m³
NO0.17 µg/m³

Weather Alerts and Warnings for Philadelphia

Severe Future Possible

Flood Watch

Flood Watch issued July 18 at 2:13AM EDT until July 19 at 2:00AM EDT by NWS Mount Holly NJ
Jul 18, 10:00 AM Jul 19, 2:00 AM
WHAT: Flash flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of northern Delaware, including the following
area, New Castle, New Jersey, including the following areas,
Camden, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon,
Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem,
Somerset, Southeastern Burlington, Sussex, Warren and Western
Monmouth, and Pennsylvania, including the following areas, Berks,
Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh,
Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks,
Western Chester and Western Montgomery.

WHEN: From 10 AM EDT this morning through late tonight.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Creeks and streams may rise out of their banks. Flooding may occur
in poor drainage and urban areas.

ADDITIONAL DETAILS:
- Multiple rounds of heavy showers and thunderstorms are
expected for Saturday into Saturday night. Storms will be
capable of producing rainfall amounts of 2 to 3 inches within
a period of just one to two hours leading to flash flooding.
- http://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Updated: Jul 18, 9:57 AM Source: NWS Alert

Air Quality Alert

Air Quality Alert issued July 17 at 3:45PM EDT by NWS Mount Holly NJ
Jul 17, 3:45 PM Jul 19, 12:00 AM
The Delaware Valley Regional Planning Commission has issued
a code orange air quality alert Saturday for The Philadelphia
Metro area.

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

For more information on ground-level ozone and fine
particles...visit http://www.phila.gov/health/units/ams/
Updated: Jul 18, 9:57 AM Source: NWS Alert