Jefferson, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Jefferson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Showers54%0.12″95°70°—
- SundayJul 5Rain44%0.20″90°71°-5°
- MondayJul 6Thunderstorm77%—83°69°-7°
- TuesdayJul 7Thunderstorm53%—77°65°-6°
- WednesdayJul 8Light Drizzle15%0.02″82°64°+5°
- ThursdayJul 9Light Drizzle38%0.01″86°62°+4°
- FridayJul 10Light Drizzle73%0.06″73°68°-13°
AQI 85 (Moderate), driven by Ozone. AQI up 15 in the last 6 hours — air quality is degrading. Ozone at AQI 66 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
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 66 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 66
- UV peak
- 1.4 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 66
PM × Wind × Precip
PM2.5 at 7.7 µg/m³, PM10 at 8.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- breezy
- 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
- 11:14 PM
- Moonset
- 10:24 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Jefferson at a glance
- Today vs. normal: 23°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 code: 15344
16-Day Forecast — Jefferson
- Sat95°70°54%
- Sun90°71°44%
- Mon83°69°77%
- Tue77°65°53%
- Wed82°64°15%
- Thu86°62°38%
- Fri73°68°73%
- Sat84°64°55%
- Sun76°59°28%
- Mon78°54°27%
- Tue79°55°20%
- Wed84°55°35%
- Thu87°59°39%
- Fri77°62°42%
- Sat83°68°43%
- Sun80°66°36%
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 — Jefferson
SPC has placed Jefferson 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 Jefferson
- 15344