Duncannon, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Duncannon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain30%0.48″99°75°—
- SundayJul 5Showers93%0.27″92°73°-7°
- MondayJul 6Heavy Drizzle93%0.15″73°65°-19°
- TuesdayJul 7Drizzle67%0.03″74°63°+1°
- WednesdayJul 8Mostly Clear13%—85°56°+11°
- ThursdayJul 9Light Drizzle31%—91°66°+6°
- FridayJul 10Light Drizzle34%—89°68°-2°
AQI 56 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 50 now. With UV 4.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 29 around 1 PM.
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 50 now. With UV 4.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 29 around 1 PM.
- Present
- AQI 50
- UV peak
- 4.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 29
PM × Wind × Precip
PM2.5 at 8.2 µg/m³ (AQI 46) with a 0.94 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- Wind
- light
- 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
- 11:02 PM
- Moonset
- 10:11 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Duncannon 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: 17020
16-Day Forecast — Duncannon
- Sat99°75°30%
- Sun92°73°93%
- Mon73°65°93%
- Tue74°63°67%
- Wed85°56°13%
- Thu91°66°31%
- Fri89°68°34%
- Sat89°70°35%
- Sun76°65°26%
- Mon72°65°17%
- Tue80°63°13%
- Wed87°67°19%
- Thu95°68°22%
- Fri96°72°31%
- Sat86°70°39%
- Sun90°68°25%
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 — Duncannon
SPC has placed Duncannon 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 Duncannon
- 17020