Collegeville, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Collegeville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle45%0.05″102°73°—
- SundayJul 5Heavy Rain94%1.0″97°72°-5°
- MondayJul 6Thunderstorm94%0.31″75°64°-22°
- TuesdayJul 7Light Drizzle72%—72°58°-3°
- WednesdayJul 8Overcast15%—84°55°+12°
- ThursdayJul 9Mostly Clear29%—89°62°+5°
- FridayJul 10Light Drizzle32%—91°68°+2°
AQI 57 (Moderate), driven by PM2.5. AQI up 6 over the last 6 hours (gradual rise). PM2.5 at 14.4 µg/m³ (AQI 61) with a 0.91 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 6 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 46 now. With UV 4.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 29 around 1 PM.
- Present
- AQI 46
- UV peak
- 4.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 29
PM × Wind × Precip
PM2.5 at 14.4 µg/m³ (AQI 61) with a 0.91 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.91
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 10:55 PM
- Moonset
- 10:05 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Collegeville at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 17 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 19426
16-Day Forecast — Collegeville
- Sat102°73°45%
- Sun97°72°94%
- Mon75°64°94%
- Tue72°58°72%
- Wed84°55°15%
- Thu89°62°29%
- Fri91°68°32%
- Sat83°71°31%
- Sun72°67°27%
- Mon71°66°14%
- Tue81°65°16%
- Wed89°65°24%
- Thu92°71°23%
- Fri93°71°34%
- Sat78°70°39%
- Sun86°68°35%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, 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 — Collegeville
SPC has placed Collegeville 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 Collegeville
- 19426