Chambersburg, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Chambersburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain29%0.69″99°74°—
- SundayJul 5Rain95%0.24″94°73°-5°
- MondayJul 6Thunderstorm82%0.07″84°67°-10°
- TuesdayJul 7Heavy Drizzle68%—77°64°-7°
- WednesdayJul 8Overcast15%—86°60°+9°
- ThursdayJul 9Overcast39%—91°63°+5°
- FridayJul 10Light Drizzle37%—83°67°-8°
AQI 55 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 11.4 µg/m³ (AQI 55) with a 0.93 fine-to-coarse ratio and 4 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.
What's driving it
Ozone × UV × Sky
Ozone at AQI 45 now. With UV 1.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 11 around 1 PM.
- Present
- AQI 45
- UV peak
- 1.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 11.4 µg/m³ (AQI 55) with a 0.93 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.93
- 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
- 11:04 PM
- Moonset
- 10:14 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Chambersburg at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 17201, 17202
15-Day Forecast — Chambersburg
- Sat99°74°29%
- Sun94°73°95%
- Mon84°67°82%
- Tue77°64°68%
- Wed86°60°15%
- Thu91°63°39%
- Fri83°67°37%
- Sat84°64°36%
- Sun85°68°25%
- Mon82°62°19%
- Tue85°69°13%
- Wed76°63°23%
- Thu85°57°21%
- Fri89°62°30%
- Sat71°66°35%
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 — Chambersburg
SPC has placed Chambersburg 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 Chambersburg
- 17201