South Williamsport, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
South Williamsport weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain39%0.42″96°73°—
- SundayJul 5Heavy Rain82%0.45″92°71°-4°
- MondayJul 6Drizzle82%0.08″71°64°-21°
- TuesdayJul 7Light Drizzle54%0.02″80°62°+9°
- WednesdayJul 8Overcast14%—85°58°+5°
- ThursdayJul 9Overcast36%—90°60°+5°
- FridayJul 10Light Drizzle42%—86°65°-4°
AQI 53 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 46 now. With UV 1.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 11 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 46 now. With UV 1.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 11 around 1 PM.
- Present
- AQI 46
- UV peak
- 1.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 6.6 µg/m³, PM10 at 6.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.96
- Wind
- light
- 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
- 11:03 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
South Williamsport at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 23 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — South Williamsport
- Sat96°73°39%
- Sun92°71°82%
- Mon71°64°82%
- Tue80°62°54%
- Wed85°58°14%
- Thu90°60°36%
- Fri86°65°42%
- Sat87°68°25%
- Sun76°66°28%
- Mon71°65°17%
- Tue83°63°19%
- Wed85°65°24%
- Thu93°67°24%
- Fri89°69°29%
- Sat87°70°39%
- Sun89°65°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 — South Williamsport
SPC has placed South Williamsport 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 South Williamsport
- 17702