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 5Light Showers83%0.60″88°71°—
- MondayJul 6Drizzle44%0.04″76°70°-12°
- TuesdayJul 7Heavy Rain49%0.10″70°62°-6°
- WednesdayJul 8Overcast37%—74°62°+4°
- ThursdayJul 9Light Drizzle43%—88°66°+14°
- FridayJul 10Light Drizzle50%0.01″77°68°-11°
- SaturdayJul 11Overcast35%—80°64°+3°
AQI 77 (Moderate), driven by Ozone. AQI up 48 in the last 6 hours — air quality is degrading. Ozone at AQI 98 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
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 98 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 98
- UV peak
- 2.3 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 98
PM × Wind × Precip
PM2.5 at 10.5 µg/m³, PM10 at 11.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- light
- Recent rain
- 1h 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
- 11:23 PM
- Moonset
- 11:15 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Penryn at a glance
- Today vs. normal: 18°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
- Sun90°71°83%
- Mon76°70°44%
- Tue70°62°49%
- Wed74°62°37%
- Thu88°66°43%
- Fri77°68°50%
- Sat80°64°35%
- Sun68°63°19%
- Mon83°63°18%
- Tue66°59°14%
- Wed72°62°16%
- Thu80°58°39%
- Fri84°60°30%
- Sat82°63°29%
- Sun78°64°23%
- Mon69°64°26%
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
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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