Winterstown, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Winterstown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast30%—100°76°—
- SundayJul 5Heavy Rain90%0.55″94°71°-6°
- MondayJul 6Light Showers90%0.15″74°62°-20°
- TuesdayJul 7Light Drizzle70%0.01″68°58°-6°
- WednesdayJul 8Foggy14%—81°54°+13°
- ThursdayJul 9Light Drizzle26%—86°67°+5°
- FridayJul 10Drizzle40%0.01″87°68°+1°
AQI 54 (Moderate), driven by PM2.5. AQI projected to climb to 79 over the next 6 hours. PM2.5 at 9.5 µg/m³, PM10 at 10.2 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 during the projected peak around 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 49 now. With UV 4.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 28 around 1 PM.
- Present
- AQI 49
- UV peak
- 4.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 28
PM × Wind × Precip
PM2.5 at 9.5 µg/m³, PM10 at 10.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- Wind
- light
- Recent rain
- 0h 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
- 10:59 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Winterstown at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Winterstown
- Sat99°75°30%
- Sun94°71°90%
- Mon74°62°90%
- Tue68°58°70%
- Wed81°54°14%
- Thu86°67°26%
- Fri87°68°40%
- Sat84°69°36%
- Sun73°64°27%
- Mon68°62°15%
- Tue74°63°12%
- Wed84°66°24%
- Thu90°69°26%
- Fri91°71°35%
- Sat77°70°42%
- Sun83°67°44%
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 — Winterstown
SPC has placed Winterstown 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 Winterstown
- 17356
- 17322