Harmonsburg, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Harmonsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle60%—91°67°—
- SundayJul 5Light Drizzle65%0.02″83°68°-8°
- MondayJul 6Thunderstorm53%0.01″73°64°-10°
- TuesdayJul 7Light Drizzle16%—82°61°+9°
- WednesdayJul 8Overcast——84°60°+2°
- ThursdayJul 9Drizzle45%0.01″86°63°+2°
- FridayJul 10Light Drizzle33%—83°65°-3°
AQI 35 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 6.6 µg/m³ (AQI 37) with a 0.94 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 31 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 31
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 6.6 µg/m³ (AQI 37) with a 0.94 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- 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
- 11:18 PM
- Moonset
- 10:23 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Harmonsburg at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 16422
16-Day Forecast — Harmonsburg
- Sat88°67°60%
- Sun83°68°65%
- Mon73°64°53%
- Tue82°61°16%
- Wed84°60°6%
- Thu86°63°45%
- Fri83°65°33%
- Sat84°63°29%
- Sun73°61°24%
- Mon72°59°16%
- Tue78°57°18%
- Wed86°66°32%
- Thu89°65°31%
- Fri86°67°53%
- Sat82°67°38%
- Sun84°61°40%
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 — Harmonsburg
SPC has placed Harmonsburg in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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 Harmonsburg
- 16422