Harleysville, Pennsylvania Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Harleysville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Showers63%0.93″98°72°—
- SundayJul 5Heavy Showers67%1.1″88°73°-10°
- MondayJul 6Light Rain88%0.07″80°65°-8°
- TuesdayJul 7Drizzle70%0.01″73°65°-7°
- WednesdayJul 8Overcast24%—73°63°0°
- ThursdayJul 9Light Drizzle27%—89°65°+16°
- FridayJul 10Drizzle42%0.09″88°71°-1°
AQI 71 (Moderate), driven by PM2.5. AQI down 32 over the last 6 hours — air quality is improving sharply. PM scrubbed by 2 hours of recent rain — PM2.5 down to 10.3 µg/m³, PM10 to 10.5 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 33. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 33
- 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 10.3 µg/m³, PM10 to 10.5 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
- 11:19 PM
- Moonset
- 11:11 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Harleysville at a glance
- Today vs. normal: 4°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: 19438
16-Day Forecast — Harleysville
- Sat98°72°63%
- Sun88°73°67%
- Mon80°65°88%
- Tue73°65°70%
- Wed73°63°24%
- Thu89°65°27%
- Fri88°71°42%
- Sat84°64°33%
- Sun78°63°15%
- Mon84°59°14%
- Tue87°62°12%
- Wed84°66°38%
- Thu85°64°32%
- Fri90°63°30%
- Sat86°69°41%
- Sun90°73°41%
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 — Harleysville
SPC has placed Harleysville 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 Harleysville
- 19438
- 19441