West Chester, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
West Chester weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast36%—99°76°—
- SundayJul 5Rain44%0.21″93°74°-6°
- MondayJul 6Thunderstorm95%0.12″74°71°-19°
- TuesdayJul 7Light Showers73%0.01″79°67°+5°
- WednesdayJul 8Light Drizzle18%—77°64°-2°
- ThursdayJul 9Overcast16%—87°66°+10°
- FridayJul 10Light Drizzle40%—86°70°-1°
AQI 66 (Moderate), driven by Ozone. AQI up 8 over the last 6 hours (gradual rise). Ozone at AQI 108 now. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 121 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 108 now. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 121 around 1 PM.
- Present
- AQI 108
- UV peak
- 8.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 121
PM × Wind × Precip
PM2.5 at 7.6 µg/m³, PM10 at 8.2 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
- 10:56 PM
- Moonset
- 10:06 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
West Chester at a glance
- Today vs. normal: 25°F above the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 19380, 19382, 19383
16-Day Forecast — West Chester
- Sat99°76°36%
- Sun93°73°44%
- Mon74°71°95%
- Tue79°67°73%
- Wed77°64°18%
- Thu87°66°16%
- Fri86°70°40%
- Sat86°70°29%
- Sun80°68°29%
- Mon78°67°24%
- Tue85°65°21%
- Wed88°65°26%
- Thu88°69°29%
- Fri92°74°32%
- Sat91°70°26%
- Sun88°73°24%
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 — West Chester
SPC has placed West Chester in the Enhanced Risk category for severe thunderstorms today.
- TODAYENHEnhanced Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.
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 West Chester
- 19380
- 19382
- 19383