Harmonsburg, Pennsylvania Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Harmonsburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——81°52°—
- FridayJun 5Overcast——83°58°+2°
- SaturdayJun 6Showers81%—78°60°-5°
- SundayJun 7Light Drizzle43%—77°59°-1°
- MondayJun 8Clear——84°55°+7°
- TuesdayJun 9Mostly Clear——86°59°+2°
- WednesdayJun 10Overcast25%—86°58°0°
AQI 24 (Good), driven by PM2.5. AQI down 19 over the last 6 hours — air quality is improving sharply.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:55 AM
- Moonset
- 1:16 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Harmonsburg at a glance
- Today vs. normal: 20°F below the seasonal normal for this latitude
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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 Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3SLGTSlight 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.