Derry, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Derry weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain38%0.85″94°68°—
- SundayJul 5Heavy Rain79%3.3″90°71°-4°
- MondayJul 6T-storm w/ Hail79%—81°66°-9°
- TuesdayJul 7Light Drizzle36%—82°65°+1°
- WednesdayJul 8Overcast11%—85°58°+3°
- ThursdayJul 9Light Drizzle46%—86°64°+1°
- FridayJul 10Drizzle56%—79°66°-7°
AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 15.9 µg/m³ (AQI 64) with a 0.95 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.
What's driving it
Ozone × UV × Sky
Ozone at AQI 40 now. With UV 3.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 20 around 1 PM.
- Present
- AQI 40
- UV peak
- 3.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 15.9 µg/m³ (AQI 64) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.95
- 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
- 11:11 PM
- Moonset
- 10:20 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Derry at a glance
- Today vs. normal: 5°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: 15627
16-Day Forecast — Derry
- Sat94°68°38%
- Sun90°71°79%
- Mon81°66°79%
- Tue82°65°36%
- Wed85°58°11%
- Thu86°64°46%
- Fri79°66°56%
- Sat82°67°43%
- Sun76°64°33%
- Mon71°59°19%
- Tue76°59°21%
- Wed83°65°26%
- Thu88°66°35%
- Fri86°69°52%
- Sat82°69°46%
- Sun83°66°45%
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 — Derry
SPC has placed Derry in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWMRGLMarginal 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 Derry
- 15627