Penn, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Penn weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain50%1.1″93°69°—
- SundayJul 5Light Drizzle46%0.02″88°70°-5°
- MondayJul 6T-storm w/ Hail85%0.13″79°69°-9°
- TuesdayJul 7Thunderstorm58%0.01″76°65°-3°
- WednesdayJul 8Light Drizzle18%0.02″81°65°+5°
- ThursdayJul 9Drizzle37%—83°61°+2°
- FridayJul 10Heavy Drizzle72%0.12″77°67°-6°
AQI 107 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 50 in the last 6 hours — air quality is degrading. Ozone at AQI 55 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 55 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 55
- UV peak
- 0.6 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 55
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 9.0 µg/m³, PM10 to 9.4 µg/m³.
- PM2.5/PM10
- 0.96
- Wind
- breezy
- 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
- 11:13 PM
- Moonset
- 10:22 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Penn at a glance
- Today vs. normal: 16°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 15675
16-Day Forecast — Penn
- Sat93°69°50%
- Sun88°70°46%
- Mon79°69°85%
- Tue76°65°58%
- Wed81°65°18%
- Thu83°61°37%
- Fri77°67°72%
- Sat79°63°57%
- Sun76°58°29%
- Mon76°54°30%
- Tue77°54°21%
- Wed80°56°35%
- Thu83°58°35%
- Fri77°60°34%
- Sat83°67°32%
- Sun77°66°46%
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 — Penn
SPC has placed Penn in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWMRGLMarginal 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 Penn
- 15675