Williamstown, New Jersey Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Williamstown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Light Rain66%0.09″94°73°—
- MondayJul 6Heavy Drizzle88%0.06″85°71°-9°
- TuesdayJul 7Light Showers71%—74°67°-11°
- WednesdayJul 8Overcast28%—80°63°+6°
- ThursdayJul 9Light Drizzle20%—90°64°+10°
- FridayJul 10Light Drizzle40%—95°71°+5°
- SaturdayJul 11Overcast35%—87°66°-8°
AQI 88 (Moderate), driven by PM2.5. AQI down 50 over the last 6 hours — air quality is improving sharply. PM scrubbed by 2 hours of recent rain — PM2.5 down to 8.8 µg/m³, PM10 to 9.3 µg/m³.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 46. Overcast through the UV peak window (cloud cover ~90%) — afternoon ozone should stay flat.
- Present
- AQI 46
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 8.8 µg/m³, PM10 to 9.3 µg/m³.
- PM2.5/PM10
- 0.95
- Wind
- light
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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
- 11:16 PM
- Moonset
- 11:09 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Williamstown at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: April 14 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 08094
15-Day Forecast — Williamstown
- Sun94°73°66%
- Mon85°71°88%
- Tue74°67°71%
- Wed80°63°28%
- Thu90°64°20%
- Fri95°71°40%
- Sat87°66°35%
- Sun79°65°17%
- Mon87°61°13%
- Tue87°60°9%
- Wed92°65°27%
- Thu91°67°32%
- Fri90°66°29%
- Sat87°67°35%
- Sun95°72°42%
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 — Williamstown
SPC has placed Williamstown 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 Williamstown
- 08094