Live · updated 1 min ago
Trenton weather alerts
No active National Weather Service alerts for Trenton, New Jersey right now.
0 in the last 30 days 0 in 12 months (since Aug 30) Get alerts on your phone →
Active alerts for Mercer County
NWS issues alerts by county; Trenton is in Mercer County. Refreshed every few minutes; times in EDT.
All clear in Mercer County
No warnings, watches or advisories are in effect. See what is active across the country, or check a neighbouring county below.
Get Trenton alerts on your phone before you think to look them up
Forecast Bar watches the official alert feeds around the clock, NWS in the United States and Environment Canada in Canada, and pushes every warning, watch and advisory for your saved locations the moment it is issued. This page is the same data, a few minutes later.
- Push notifications for severe weather, with Critical Alerts that break through Focus modes
- Storm Tracker and Live Activities that follow a storm cell on your Lock Screen
- Radar with warnings drawn on the map, on iPhone, iPad, Apple Watch, Mac and Apple TV
- Rain alerts, air quality, tides, aurora and custom thresholds you set yourself
Where
Mercer County on the map
Alert polygons are NWS's own. Forecast Bar's radar shows the same warnings over live precipitation, with future radar and lightning. See the radar.
Last 30 days
Recent alerts for Mercer County
No alerts have been recorded for Mercer County in the last 30 days (records begin August 30, 2026).
Pattern
What Mercer County gets alerted for
Every alert that named Mercer County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.
Nothing recorded yet for Mercer County.
Nearby
Alerts near Trenton
Cities
Neighbouring counties in New Jersey
Questions
About Trenton alerts
How do I get Trenton weather alerts on my iPhone?
Install Forecast Bar, add Trenton as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Mercer County then arrives as a push notification at the moment of issue, with Critical Alerts available for the most dangerous warnings. Forecast Bar also runs on iPad, Apple Watch, Mac and Apple TV.
Where do these alerts come from?
From the National Weather Service alert feed (api.weather.gov). NWS issues alerts by county and by forecast zone; this page lists every product that names Mercer County, the county Trenton sits in. Forecast Bar checks the feed continuously and this page refreshes within a few minutes of a change.
What is the difference between a watch, a warning and an advisory?
A warning means the hazard is occurring, imminent or very likely: act now. A watch means conditions are favourable for it to develop: prepare and stay informed. An advisory covers a hazard that is less serious than a warning but can still cause real inconvenience or danger if you are not ready for it.
Can I get this data as JSON?
Yes. /weather-alerts/nj/trenton.json returns the active alerts, the last 30 days and the 12-month counts for Trenton, refreshed every minute. Please cache responses and credit National Weather Service as the source.
Never find out about a Mercer County alert from this page again
Add Trenton in Forecast Bar and every NWS warning, watch and advisory arrives as a push notification the moment it is issued, on iPhone, iPad, Apple Watch, Mac and Apple TV.
Free to download; live weather requires a subscription, and every subscription includes a 7-day free trial for new subscribers. Mac and iOS plans are separate; Apple TV is included with Forecast Bar Gold on iOS.