Chester, Pennsylvania Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Chester weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Drizzle34%0.09″99°78°—
- SundayJul 5Heavy Rain54%1.2″92°74°-7°
- MondayJul 6Light Showers94%0.49″81°70°-11°
- TuesdayJul 7Light Showers83%—74°68°-7°
- WednesdayJul 8Overcast23%—77°66°+3°
- ThursdayJul 9Light Drizzle12%—91°67°+14°
- FridayJul 10Light Drizzle41%0.01″92°74°+1°
AQI 117 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 50 in the last 6 hours — air quality is degrading. Ozone at AQI 76. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 76. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 76
- UV peak
- 0.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 9
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 7.9 µg/m³, PM10 to 8.1 µg/m³.
- PM2.5/PM10
- 0.98
- 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
- 11:18 PM
- Moonset
- 11:11 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Chester at a glance
- Today vs. normal: 22°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.
ZIP code: 19013
16-Day Forecast — Chester
- Sat99°78°34%
- Sun92°74°54%
- Mon81°70°94%
- Tue74°68°83%
- Wed77°66°23%
- Thu91°67°12%
- Fri92°74°41%
- Sat88°68°37%
- Sun77°68°30%
- Mon87°65°21%
- Tue89°66°16%
- Wed91°68°41%
- Thu89°71°41%
- Fri92°72°35%
- Sat88°72°29%
- Sun94°76°39%
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 — Chester
SPC has placed 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 Chester
- 19013
- 19016