Jefferson County, Pennsylvania, United States

Last updated: 2:03 PM CDT  ·  Refresh
19°C
Feels like 20°
Mostly Cloudy
▲ 21°  /  ▼ 11°
Wind
6 mph NE
Humidity
92%
Dew Point
18°
Pressure
28.39 inHg
Visibility
8 mi
UV Index
5.0
Cloud Cover
82%
Sunrise
6:30 AM
Sunset
8:07 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Jefferson County is currently mostly cloudy at 19°C. Precipitation is likely — peak probability 68% around 3 PM. Sunrise: 6:30AM · Sunset: 8:07PM.

Alerts

No active alerts for this location.
29 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
19°
68%
4 PM
20°
32%
5 PM
20°
23%
6 PM
21°
23%
7 PM
21°
8%
8 PM
19°
15%
9 PM
18°
15%
10 PM
16°
6%
11 PM
16°
6%
12 AM
15°
6%
1 AM
14°
15%
2 AM
13°
15%
3 AM
13°
15%
4 AM
12°
15%
5 AM
12°
16%
6 AM
11°
16%
7 AM
12°
16%
8 AM
12°
16%
9 AM
13°
16%
10 AM
16°
7%
11 AM
17°
9%
12 PM
18°
9%
1 PM
19°
9%
2 PM
23°
10%
7-Day Forecast
Today
21° 11°
Mostly Cloudy with a 68% chance of rain.
Fri
25° 11°
Fog.
Sat
26° 15°
Mostly Cloudy with a 66% chance of rain.
Sun
23° 12°
Rain, 68% chance.
Mon
23° 10°
Drizzle, 42% chance.
Tue
26° 10°
Drizzle, 70% chance.
Wed
25° 13°
Clear with a 53% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 19° Mostly Cloudy 68% 6 mph NE 92%
4 PM 20° Mostly Cloudy 32% 6 mph NE 88%
5 PM 20° Partly Cloudy 23% 6 mph NE 85%
6 PM 21° Partly Cloudy 23% 5 mph NE 86%
7 PM 21° Partly Cloudy 8% 4 mph NE 87%
8 PM 19° Mostly Clear 15% 4 mph NE 90%
9 PM 18° Mostly Clear 15% 4 mph NE 92%
10 PM 16° Mostly Clear 6% 4 mph ENE 95%
11 PM 16° Clear 6% 3 mph ENE 97%
12 AM 15° Mostly Clear 6% 3 mph ENE 97%
1 AM 14° Mostly Clear 15% 3 mph ENE 96%
2 AM 13° Partly Cloudy 15% 3 mph ENE 96%
3 AM 13° Fog 15% 3 mph ENE 96%
4 AM 12° Fog 15% 3 mph NE 96%
5 AM 12° Fog 16% 3 mph NE 97%
6 AM 11° Fog 16% 3 mph NE 96%
7 AM 12° Fog 16% 3 mph NE 94%
8 AM 12° Fog 16% 3 mph NE 92%
9 AM 13° Fog 16% 4 mph ENE 84%
10 AM 16° Fog 7% 4 mph ENE 76%
11 AM 17° Fog 9% 5 mph E 71%
12 PM 18° Mostly Clear 9% 5 mph E 64%
1 PM 19° Mostly Clear 9% 5 mph E 57%
2 PM 23° Clear 10% 6 mph E 51%
15-Day Forecast
Today
8/20
Mostly Cloudy
68%
11°
21°
Fri
8/21
Fog
16%
11°
25°
Sat
8/22
Mostly Cloudy
66%
15°
26°
Sun
8/23
Rain
68%
12°
23°
Mon
8/24
Drizzle
42%
10°
23°
Tue
8/25
Drizzle
70%
10°
26°
Wed
8/26
Clear
53%
13°
25°
Thu
8/27
Rain
63%
14°
25°
Fri
8/28
Drizzle
44%
13°
27°
Sat
8/29
Drizzle
51%
14°
28°
Sun
8/30
Drizzle
60%
16°
26°
Mon
8/31
Drizzle
60%
15°
26°
Tue
9/1
Drizzle
60%
14°
26°
Wed
9/2
Drizzle
60%
13°
26°
Thu
9/3
Drizzle
60%
13°
27°
29
Good
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is satisfactory and poses little or no health risk.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
29 AQI 5.2 µg/m³
O3
Ground-level ozone
28 AQI 30 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 29 Good 28 29
Sat 32 Good 32 22
Sun 48 Good 42 48
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Thu Aug 20, 17:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 90 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE120 J/kg
MLCAPE58 J/kg
MUCAPE120 J/kg
SBCIN-20 J/kg
MLCIN-51 J/kg
Lifted Index0.1
Kinematics
0–6 km Shear43 kt
0–1 km Shear5 kt
Eff. Shear19 kt
0–1 km SRH41
0–3 km SRH88
Eff. SRH88
Storm Motion273° @ 23 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index34.3
Thermo & Levels
PWAT1.65 in
0–3 km LR5.6 °C/km
700–500 LR5.1 °C/km
Total Totals44.7
LCL939 hPa
LFC751 hPa
EL505 hPa
Freezing Lvl11,401 ft