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WeatherLive › Pennsylvania › South Williamsport

South Williamsport, PA Weather

Today Hourly 10-Day Weekend Monthly Radar Air Quality Climate
Current WeatherSouth Williamsport · 10:35 PM EDT
92° | 66°
76°F
Feels like 83°
Sunny
WindNW 2 mph · Gusts 7 mph
Precip14% · –
Humidity79% · Dew point 69°
UV index7 High
Air Quality36 Good
Pressure29.97 inHg
Visibility6 mi
Sunrise / Sunset6:34 AM · 7:41 PM · 13h 7m

Weather map — South Williamsport

Full radar →
Now
76°
9%
2 mph
23:00
75°
12%
1 mph
00:00
73°
25%
0 mph
01:00
72°
32%
2 mph
02:00
72°
35%
3 mph
03:00
71°
35%
1 mph
04:00
71°
35%
1 mph
05:00
71°
37%
1 mph
06:00
70°
37%
2 mph
07:00
68°
43%
2 mph
08:00
67°
0.04 in
0 mph
09:00
69°
0.07 in
2 mph
10:00
70°
0.03 in
1 mph
11:00
70°
0.04 in
1 mph
12:00
71°
0.03 in
5 mph
13:00
73°
0.02 in
4 mph
14:00
77°
24%
3 mph
15:00
79°
19%
3 mph
16:00
80°
13%
4 mph
17:00
81°
13%
5 mph
18:00
77°
36%
7 mph
19:00
75°
27%
6 mph
20:00
73°
25%
4 mph
21:00
71°
43%
4 mph

Today · Tue 9/1

High 92°
14% / –

Sunny. Winds W at 10 mph.

Tonight · Tue 9/1

Low 67°
12% / –

Sunny. Winds N at 1 mph.

Tomorrow · Wed 9/2

81° | 67°
89% / 0.33 in

Showers. Winds SE at 7 mph.

7-day trend

South Williamsport · temperature + precipitation

10-day forecast

Updated 10:35 PM

Details & indices

Wind
2 mph NW
Gusts 7 mph
Humidity
79%
Dew point 69°
Pressure
29.97 inHg
Rising
UV index
7 — High
High today
Air Quality
Good
AQI 36 · US EPA
Allergy
Very high
Grass
Visibility
6 mi
Clear view
Allergy — South Williamsport

🌿 Conditions right now

View all →
Birch
None
Grass
High
Oak
None
Alder
None
Hazel
None
Mugwort
Moderate
Ragweed
Moderate

Sun & moon

Sunrise6:34 AM
Sunset7:41 PM
Length of day13h 7m
Moonrise9:35 PM
Moonset11:29 AM
Moon phase🌖 Waning Gibbous · 74%
Next full moonSep 26 Harvest Moon
Latitude41.2320°N
Longitude-76.9991°E

Water temps nearby

View all →
No beaches within 50 miles
🌤️No rain expected in the next 90 minutes
Now+30+60+90 min
Minute-by-minute precip · HRRR nowcast

Daily planner

computed from today's forecast
Laundry day
Great
Line-drying weather
Grilling
Great
Fire up the grill
Running
Fair
Lace up outside
Patio
Great
Dinner outdoors
Nearby places in {{REGION}}
Philadelphia
Rain
77°
Pittsburgh
Mostly cloudy
80°
Data sources · Tuesday, September 1
Where the South Williamsport forecast comes from
This page blends NOAA/NWS model guidance with global ensembles for the 10-day outlook, air quality and alerts. Data refreshes every hour, current conditions every 15 minutes. Coordinates: 41.2320°N, -76.9991°.
NBM + global weather models
Updated: 10:35 PM
Weather in South Williamsport
Over the next 10 days South Williamsport tops out around 92° (Tuesday) and dips to 42° on the coolest night (Thursday). Models drop roughly 0.90 in of precipitation across the stretch — watch Wednesday (89%). Expect a blustery spell — gusts near 26 mph on Wednesday. Heads up: 3 NWS alerts are active right now, including a Flash Flood Warning — details on the alerts tab. Right now South Williamsport is about 11° cooler than nearby Washington. Longer view: classic Northeast mix — nor'easters, humid spells and a glorious fall.
South Williamsport, PA · Elev 522 ft · 41.23°N, 77.00°W · Pennsylvania · Forecast computed for these exact coordinates
Powered by NWS/NOAA guidance, multi-model forecasts and official environmental feeds · NOAA/NWS · EPA AirNow · MET Norway · global models
Updated: 10:35 PM