Princeton Junction, New Jersey Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Princeton Junction weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Heavy Rain70%2.5″88°73°—
- MondayJul 6Light Showers94%0.51″79°68°-9°
- TuesdayJul 7Heavy Drizzle85%0.02″71°64°-8°
- WednesdayJul 8Overcast36%—76°60°+5°
- ThursdayJul 9Light Drizzle14%—85°63°+9°
- FridayJul 10Heavy Drizzle42%0.13″90°71°+5°
- SaturdayJul 11Overcast35%—85°64°-5°
AQI 48 (Good), driven by PM2.5. AQI down 53 over the last 6 hours — air quality is improving sharply. PM2.5 at 9.5 µg/m³, PM10 at 9.6 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 9.5 µg/m³, PM10 at 9.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.99
- Wind
- light
- Recent rain
- 1h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:15 PM
- Moonset
- 11:08 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Princeton Junction at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 08550
15-Day Forecast — Princeton Junction
- Sun88°73°70%
- Mon79°68°94%
- Tue71°64°85%
- Wed76°60°36%
- Thu85°63°14%
- Fri90°71°42%
- Sat85°64°35%
- Sun76°63°24%
- Mon84°60°15%
- Tue89°61°18%
- Wed90°65°34%
- Thu86°64°34%
- Fri87°64°30%
- Sat84°66°26%
- Sun93°73°36%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Princeton Junction
SPC has placed Princeton Junction in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Princeton Junction
- 08550
- 08540