Today | Weather | Wednesday, May 20, 2026
Active Weather Warnings

Weather in Trenton, New Jersey

05:53 PM
Now
Cloudy Weather
86° F
Feels Like 84°
Precipitation 49 %
Wind 16 mph
UV Index (0 - 11+) 1
Humidity 54 %
Today
Sunny with a Chance of Thunderstorms
Day 93°
Night 57°
Precipitation 85 %
Wind 10 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Trenton Weather Forecast Updated

Last updated on

Air Quality in Trenton

NOW
49 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.18 µg/m³
PM10 7.05 µg/m³
O3 0.053 ppm
NO2 1.5 ppb
SO2 0.6 ppb
CO 0.11 ppm
NH3 1.7 µg/m³
NO 0.18 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)
PM2.55.18 µg/m³
PM107.05 µg/m³
O3103.28 µg/m³
NO22.77 µg/m³
SO21.46 µg/m³
CO128.18 µg/m³
NH31.7 µg/m³
NO0.18 µg/m³

Weather Alerts and Warnings for Trenton

Severe Future Possible

Severe Thunderstorm Watch

Severe Thunderstorm Watch issued May 20 at 2:10PM EDT until May 20 at 9:00PM EDT by NWS Mount Holly NJ
May 20, 2:10 PM May 20, 9:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
235 IN EFFECT UNTIL 9 PM EDT THIS EVENING FOR THE FOLLOWING AREAS

IN DELAWARE THIS WATCH INCLUDES 3 COUNTIES

IN CENTRAL DELAWARE

KENT

IN NORTHERN DELAWARE

NEW CASTLE

IN SOUTHERN DELAWARE

SUSSEX

IN MARYLAND THIS WATCH INCLUDES 4 COUNTIES

IN NORTHEAST MARYLAND

CAROLINE KENT QUEEN ANNE'S
TALBOT

IN NEW JERSEY THIS WATCH INCLUDES 16 COUNTIES

IN CENTRAL NEW JERSEY

MERCER MONMOUTH

IN NORTHERN NEW JERSEY

HUNTERDON MIDDLESEX MORRIS
SOMERSET SUSSEX WARREN

IN SOUTHERN NEW JERSEY

ATLANTIC BURLINGTON CAMDEN
CAPE MAY CUMBERLAND GLOUCESTER
OCEAN SALEM

IN PENNSYLVANIA THIS WATCH INCLUDES 10 COUNTIES

IN EAST CENTRAL PENNSYLVANIA

BERKS LEHIGH NORTHAMPTON

IN NORTHEAST PENNSYLVANIA

CARBON MONROE

IN SOUTHEAST PENNSYLVANIA

BUCKS CHESTER DELAWARE
MONTGOMERY PHILADELPHIA

THIS INCLUDES THE CITIES OF ALLENTOWN, ATLANTIC CITY, BETHLEHEM,
BLAIRSTOWN, CAMDEN, CENTREVILLE, CHERRY HILL, CHESTERTOWN,
DENTON, DEPTFORD, DOVER, DOYLESTOWN, EAST BRUNSWICK, EASTON,
EASTON, EDISON, FLEMINGTON, FREEHOLD, GEORGETOWN, GLASSBORO,
HAMMONTON, JIM THORPE, MEDIA, MILLVILLE, MOORESTOWN, MORRISTOWN,
MOUNT HOLLY, NEW BRUNSWICK, NEWTON, NORRISTOWN,
NORTH BRUNSWICK TOWNSHIP, OCEAN CITY, PENNSVILLE, PERTH AMBOY,
PHILADELPHIA, READING, SAYREVILLE, SOMERSET, STROUDSBURG,
TOMS RIVER, TRENTON, WEST CHESTER, AND WILMINGTON.
Updated: May 20, 4:48 PM Source: NWS Alert
Moderate Expected Likely

Heat Advisory

Heat Advisory issued May 20 at 1:53PM EDT until May 20 at 8:00PM EDT by NWS Mount Holly NJ
May 20, 1:53 PM May 20, 8:00 PM
WHAT: Heat index values up to 98 degrees expected.

WHERE: In Delaware, New Castle County. In New Jersey, Mercer,
Camden, Gloucester, and Northwestern Burlington Counties. In
Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower
Bucks, and Philadelphia Counties.

WHEN: Until 8 PM EDT this evening.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

ADDITIONAL DETAILS: Showers and thunderstorms arrive late this
afternoon and this evening which will end this early season heat.
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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.
Updated: May 20, 4:48 PM Source: NWS Alert