Hummelstown, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Hummelstown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain37%0.18″102°74°—
- SundayJul 5Rain93%0.37″95°73°-7°
- MondayJul 6Light Rain93%0.23″73°63°-22°
- TuesdayJul 7Light Drizzle65%0.02″72°61°-1°
- WednesdayJul 8Mostly Clear12%—84°56°+12°
- ThursdayJul 9Light Drizzle31%—89°65°+5°
- FridayJul 10Light Drizzle37%—87°68°-2°
AQI 57 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.7 µg/m³, PM10 at 9.3 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 6 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 48 now. With UV 4.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 28 around 1 PM.
- Present
- AQI 48
- UV peak
- 4.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 28
PM × Wind × Precip
PM2.5 at 8.7 µg/m³, PM10 at 9.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:00 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Hummelstown at a glance
- Today vs. normal: 13°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: 17036
16-Day Forecast — Hummelstown
- Sat102°74°37%
- Sun95°73°93%
- Mon73°63°93%
- Tue72°61°65%
- Wed84°56°12%
- Thu89°65°31%
- Fri87°68°37%
- Sat86°71°33%
- Sun75°65°27%
- Mon69°64°16%
- Tue79°64°13%
- Wed85°66°29%
- Thu92°69°30%
- Fri94°72°36%
- Sat82°71°42%
- Sun86°68°34%
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 — Hummelstown
SPC has placed Hummelstown 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 Hummelstown
- 17036