Northumberland, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Northumberland weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Drizzle31%0.08″96°71°—
- SundayJul 5Showers90%0.23″90°71°-6°
- MondayJul 6Thunderstorm90%0.14″81°67°-9°
- TuesdayJul 7Light Drizzle60%—73°64°-8°
- WednesdayJul 8Overcast19%—86°59°+13°
- ThursdayJul 9Overcast36%—91°62°+5°
- FridayJul 10Light Drizzle42%—84°64°-7°
AQI 55 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 43 now. With UV 1.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
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 43 now. With UV 1.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 43
- UV peak
- 1.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 7.6 µg/m³ (AQI 42) with a 0.94 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- 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
- 11:02 PM
- Moonset
- 10:09 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Northumberland at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 17857
15-Day Forecast — Northumberland
- Sat96°71°31%
- Sun90°71°90%
- Mon81°67°90%
- Tue73°64°60%
- Wed86°59°19%
- Thu91°62°36%
- Fri84°64°42%
- Sat86°64°29%
- Sun88°66°27%
- Mon85°60°20%
- Tue85°67°17%
- Wed72°60°24%
- Thu86°56°24%
- Fri87°60°29%
- Sat75°66°39%
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 — Northumberland
SPC has placed Northumberland 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 Northumberland
- 17857