Castle Shannon, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Castle Shannon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Showers43%0.48″93°70°—
- SundayJul 5Drizzle45%0.05″89°70°-4°
- MondayJul 6T-storm w/ Hail88%0.02″79°70°-10°
- TuesdayJul 7T-storm w/ Hail55%—76°65°-3°
- WednesdayJul 8Light Drizzle16%0.01″82°64°+6°
- ThursdayJul 9Light Drizzle34%—84°63°+2°
- FridayJul 10Light Showers68%0.14″75°68°-9°
AQI 104 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 46 in the last 6 hours — air quality is degrading. Ozone at AQI 75 — 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 75 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 75
- UV peak
- 1.3 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 75
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 7.8 µg/m³, PM10 to 8.4 µg/m³.
- PM2.5/PM10
- 0.93
- 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
- 11:14 PM
- Moonset
- 10:23 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Castle Shannon at a glance
- Today vs. normal: 19°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.
16-Day Forecast — Castle Shannon
- Sat93°70°43%
- Sun89°70°45%
- Mon79°70°88%
- Tue76°65°55%
- Wed82°64°16%
- Thu84°63°34%
- Fri75°68°68%
- Sat80°65°54%
- Sun77°61°25%
- Mon77°58°26%
- Tue78°58°19%
- Wed82°59°32%
- Thu85°61°29%
- Fri76°64°39%
- Sat82°68°25%
- Sun78°67°42%
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 — Castle Shannon
SPC has placed Castle Shannon 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 Castle Shannon
- 15234