Penryn, Pennsylvania Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Penryn weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain56%0.51″99°74°—
- SundayJul 5Light Showers65%0.13″91°72°-8°
- MondayJul 6Rain93%0.11″78°64°-13°
- TuesdayJul 7Light Showers77%0.08″69°64°-9°
- WednesdayJul 8Light Drizzle18%0.01″72°61°+3°
- ThursdayJul 9Overcast13%—87°63°+15°
- FridayJul 10Light Drizzle50%—83°68°-4°
AQI 64 (Moderate), driven by PM2.5. AQI down 15 over the last 6 hours — air quality is improving sharply. PM scrubbed by 2 hours of recent rain — PM2.5 down to 11.2 µg/m³, PM10 to 11.4 µg/m³.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 36
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 11.2 µg/m³, PM10 to 11.4 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
- 11:23 PM
- Moonset
- 11:15 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Penryn at a glance
- Today vs. normal: 3°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.
16-Day Forecast — Penryn
- Sat99°73°56%
- Sun91°73°65%
- Mon78°64°93%
- Tue69°64°77%
- Wed72°61°18%
- Thu87°63°13%
- Fri83°68°50%
- Sat81°61°32%
- Sun78°61°29%
- Mon80°56°19%
- Tue85°58°19%
- Wed81°62°32%
- Thu82°60°30%
- Fri85°60°29%
- Sat83°66°48%
- Sun83°68°45%
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 — Penryn
SPC has placed Penryn 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 Penryn
- 17543
- 17545
- 17521
- 17564