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 5Light Drizzle63%0.01″87°71°—
- MondayJul 6Heavy Rain66%0.59″74°68°-13°
- TuesdayJul 7Foggy51%—69°64°-5°
- WednesdayJul 8Overcast32%—81°63°+12°
- ThursdayJul 9Drizzle30%—88°67°+7°
- FridayJul 10Overcast46%—85°70°-3°
- SaturdayJul 11Overcast33%—84°66°-1°
AQI 51 (Moderate), driven by Ozone. AQI up 17 in the last 6 hours — air quality is degrading. Ozone at AQI 140 — 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.
What's driving it
Ozone × UV × Sky
Ozone at AQI 140 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 140
- UV peak
- 4.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 140
PM × Wind × Precip
PM2.5 at 15.0 µg/m³ (AQI 62) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.95
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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: 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: 19438
16-Day Forecast — Harleysville
- Sun87°71°63%
- Mon74°68°66%
- Tue69°64°51%
- Wed81°63°32%
- Thu88°67°30%
- Fri85°70°46%
- Sat84°66°33%
- Sun79°66°16%
- Mon86°66°18%
- Tue71°63°12%
- Wed75°64°16%
- Thu78°60°26%
- Fri87°63°23%
- Sat87°66°20%
- Sun79°68°21%
- Mon68°66°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 — Harleysville
SPC has placed Harleysville 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 Harleysville
- 19438
- 19441