New Jersey · NWS PHI office

Princeton, NJ weather

It is 43°F and clear at Trenton-Mercer Airport as of Oct 28, 5:05 AM EDT. Overnight: Partly Cloudy, low near 40°F. Forecast from the National Weather Service, issued Oct 28, 4:08 AM EDT.

Updated Oct 28, 5:25 AM EDT (snapshot)

Current conditions

Temperature

43°F

Clear · feels like 39°F

Wind

N 6 mph

Humidity 87% · dew point 39°F

Pressure · visibility

30.42 inHg

Visibility 10 mi

Observed at Trenton-Mercer Airport (KTTN), Oct 28, 5:05 AM EDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Princeton forecast zone right now.

Around the NWS PHI forecast area

No active alerts in zones served by the PHI office near Princeton.

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. No alerts are active anywhere in New Jersey.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Princeton (local time)
TimeTempForecastPrecip. chanceWind
Wed 7 AM41°FSunny0% 0 mph
Wed 8 AM41°FMostly Sunny1% 0 mph
Wed 9 AM45°FMostly Sunny2% 0 mph
Wed 10 AM51°FMostly Sunny2% 0 mph
Wed 11 AM56°FMostly Sunny2% 0 mph
Wed 12 PM59°FMostly Sunny2% 0 mph
Wed 1 PM63°FMostly Sunny2% 0 mph
Wed 2 PM63°FMostly Cloudy2% 0 mph
Wed 3 PM64°FPartly Sunny2% 0 mph
Wed 4 PM65°FMostly Cloudy1% 0 mph
Wed 5 PM63°FPartly Sunny1% 0 mph
Wed 6 PM60°FMostly Cloudy1% 0 mph
Wed 7 PM57°FMostly Cloudy1% 0 mph
Wed 8 PM52°FMostly Cloudy1% 0 mph
Wed 9 PM51°FMostly Cloudy1% 0 mph
Wed 10 PM49°FPartly Cloudy1% 0 mph
Wed 11 PM48°FMostly Clear1% 0 mph
Thu 12 AM47°FMostly Clear1% 0 mph
Thu 1 AM46°FClear0% 0 mph
Thu 2 AM46°FMostly Clear0% 0 mph
Thu 3 AM46°FMostly Clear0% 0 mph
Thu 4 AM44°FMostly Clear1% 0 mph
Thu 5 AM45°FMostly Clear1% 0 mph
Thu 6 AM45°FMostly Sunny1% 0 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Princeton can differ.

7-day forecast

Overnight

Low 40°F

Partly cloudy, with a low around 40. North wind around 0 mph.

Wednesday

High 65°F·Low 44°F

Mostly sunny, with a high near 65. East wind around 0 mph.

Wednesday Night: Partly cloudy, with a low around 44. Southeast wind around 0 mph.

Thursday

High 70°F·Low 50°F

Mostly sunny, with a high near 70. Northwest wind 0 to 5 mph.

Thursday Night: Mostly clear, with a low around 50. Southwest wind around 5 mph.

Friday

High 72°F·Low 42°F

Sunny, with a high near 72.

Friday Night: Mostly clear, with a low around 42.

Saturday

High 64°F·Low 42°F

Mostly sunny, with a high near 64.

Saturday Night: Mostly cloudy, with a low around 42.

Sunday

High 67°F·Low 47°F

Partly sunny, with a high near 67.

Sunday Night: A slight chance of rain showers after 1am. Mostly cloudy, with a low around 47.

Monday

High 68°F·Low 50°F

A chance of rain showers. Mostly cloudy, with a high near 68. Chance of precipitation is 30%.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.

Tuesday

High 67°F

A chance of rain showers. Mostly cloudy, with a high near 67.

Nearby cities

Larger cities in the area

Other cities in Mercer County

See every city we cover in New Jersey, or check all active alerts.

About this forecast

Forecast office
Princeton is served by the National Weather Service PHI forecast office, forecast zone NJZ015, county zone NJC021.
Location used
The Census Bureau's internal point for Princeton (40.3582, -74.6667), in Mercer County. Population: 31,445 (2024 estimate), number 28 of the 51 New Jersey cities on this site.
Radar
Nearest NWS radar: KDIX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/40.3582,-74.6667 (forecast issued Oct 28, 4:08 AM EDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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