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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

Harleysville, PA
Saturday, July 4 at 11:31 PM
75
°
Overcast
Feels like
81°
Humidity
91%
Wind
5 mph
Sunrise
1:37 AM
Sunset
4:34 PM
Harleysville, PA
Hour by hour · 24h
24-Hour ForecastHarleysville, PA: 24-hour forecast. Temperatures range from 73 to 88 degrees Fahrenheit with a 63% chance of precipitation at 11 PM.
L 73°H 88°
Harleysville, PA
7-day forecast
  1. Today
    Jul 4
    Heavy Showers
    63%
    0.93″
    98°72°
  2. Sunday
    Jul 5
    Heavy Showers
    67%
    1.1″
    88°73°-10°
  3. Monday
    Jul 6
    Light Rain
    88%
    0.07″
    80°65°-8°
  4. Tuesday
    Jul 7
    Drizzle
    70%
    0.01″
    73°65°-7°
  5. Wednesday
    Jul 8
    Overcast
    24%
    73°63°
  6. Thursday
    Jul 9
    Light Drizzle
    27%
    89°65°+16°
  7. Friday
    Jul 10
    Drizzle
    42%
    0.09″
    88°71°-1°
Harleysville, PA
Anemometer · 24h winds · from true
NESW
From · True
SW
235° · backing 125°
Direction
SW
235°
Sustained
5
mph
Gust
20
mph
Peak 24h
54
avg 7
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 · pk 54 @ 9:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 266SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 125° from the sw.
Harleysville, PA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1005.9
+4.6 mb in 3h · rising rapidly · 29.70 inHg
Now
1005.9
mb
3h
+4.6
mb
12h
+1.0
mb
24h
+0.9
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 10011006
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR-21h-18h-15h-12h-9h-6h-3h-24hNOW1006.11001.11006.1
−24h−18h−12h−6hnow
Pressure climbing out of the rain band — clearing edging in.
Harleysville, PA
Air quality
71
AQI
Moderate
-32 in 6h

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.

PM 2.5DRIVERGood
10.3μg/m³
PM 10Good
11μg/m³
NO₂Good
20μg/m³
OzoneModerate
69μg/m³
UV IndexLow
0.0

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
Harleysville, PA
Sky cover · visibility · 24h
Cloud cover
99%
OVERCAST
100%0%−24h−18h−12h−6hnow

Visibility
30.6mi
UNLIMITED
106 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
03:31 UTC · Harleysville, PA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
03:31 UTC · Harleysville, PA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Harleysville, PA
Satellite · infrared · animated
Harleysville, PA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Harleysville, PA
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:05 AM
Sunrise
1:37 AM
Daylight
14h 57m
Sunset
4:34 PM
Civil dusk
9:08 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Harleysville, PA
The moon
Waning Gibbous
76% illuminated
Moonrise
11:19 PM
Moonset
11:11 AM
In sign
♓︎ Pisces
Harleysville, PA
Microseason
Jul 1–5

Cicadas claim the afternoon

fish
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

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

  1. Sat98°72°63%
  2. Sun88°73°67%
  3. Mon80°65°88%
  4. Tue73°65°70%
  5. Wed73°63°24%
  6. Thu89°65°27%
  7. Fri88°71°42%
  8. Sat84°64°33%
  9. Sun78°63°15%
  10. Mon84°59°14%
  11. Tue87°62°12%
  12. Wed84°66°38%
  13. Thu85°64°32%
  14. Fri90°63°30%
  15. Sat86°69°41%
  16. 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

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.