Severe Thunderstorm Watch 7:00 PM Heat Advisory — Sauk, WI, Columbia, WI, Iowa, WI, Dane, WI, Lafayette, WI, Green, WI, Rock, WI, Fond Du Lac, WI, Sheboygan, WI, Washington, WI, Ozaukee, WI, Waukesha, WI, Milwaukee, WI, Racine, WI, Kenosha, WI, Marquette, WI, Green Lake, WI, Dodge, WI, Jefferson, WI, Walworth, WI 9:00 PM

Jefferson County, Wisconsin, United States

Last updated: 6:01 PM CDT  ·  Refresh
30°C
Feels like 34°
Mostly Clear
▲ 32°  /  ▼ 19°
Wind
10 mph WSW
Humidity
66%
Dew Point
24°
Pressure
28.75 inHg
Visibility
8 mi
UV Index
5.0
Cloud Cover
29%
Sunrise
5:40 AM
Sunset
8:21 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Jefferson County is currently mostly clear at 30°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 3162 J/kg) — isolated convective development possible. Sunrise: 5:40AM · Sunset: 8:21PM.

Alerts

Severe Thunderstorm Watch
Expires 7:00 PM
Heat Advisory
Sauk, WI, Columbia, WI, Iowa, WI, Dane, WI, Lafayette, WI, Green, WI, Rock, WI, Fond Du Lac, WI, Sheboygan, WI, Washington, WI, Ozaukee, WI, Waukesha, WI, Milwaukee, WI, Racine, WI, Kenosha, WI, Marquette, WI, Green Lake, WI, Dodge, WI, Jefferson, WI, Walworth, WI
Expires 9:00 PM
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
30°
25%
7 PM
31°
23%
8 PM
29°
23%
9 PM
28°
23%
10 PM
27°
21%
11 PM
26°
25%
12 AM
24°
42%
1 AM
23°
14%
2 AM
22°
14%
3 AM
22°
14%
4 AM
22°
14%
5 AM
19°
14%
6 AM
19°
3%
7 AM
19°
3%
8 AM
20°
3%
9 AM
22°
3%
10 AM
23°
3%
11 AM
24°
3%
12 PM
25°
3%
1 PM
26°
3%
2 PM
26°
3%
3 PM
26°
3%
4 PM
26°
3%
5 PM
29°
3%
7-Day Forecast
Tonight
32° 19°
Mostly Clear with a 25% chance of rain.
Tue
29° 17°
Mostly Clear with a 42% chance of rain.
Wed
31° 16°
Clear.
Thu
34° 19°
Partly Cloudy with a 41% chance of rain.
Fri
29° 18°
Mostly Cloudy with a 58% chance of rain.
Sat
31° 16°
Drizzle, 64% chance.
Sun
31° 16°
Clear with a 21% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 30° Mostly Clear 25% 10 mph WSW 66%
7 PM 31° Clear 23% 10 mph WSW 72%
8 PM 29° Clear 23% 8 mph W 74%
9 PM 28° Clear 23% 7 mph NW 79%
10 PM 27° Clear 21% 7 mph NW 83%
11 PM 26° Mostly Clear 25% 8 mph NNW 86%
12 AM 24° Partly Cloudy 42% 9 mph N 90%
1 AM 23° Partly Cloudy 14% 11 mph N 93%
2 AM 22° Mostly Cloudy 14% 11 mph N 93%
3 AM 22° Partly Cloudy 14% 10 mph N 94%
4 AM 22° Partly Cloudy 14% 9 mph N 94%
5 AM 19° Partly Cloudy 14% 9 mph N 91%
6 AM 19° Partly Cloudy 3% 10 mph N 88%
7 AM 19° Mostly Cloudy 3% 10 mph N 86%
8 AM 20° Partly Cloudy 3% 11 mph NNE 80%
9 AM 22° Partly Cloudy 3% 11 mph NNE 73%
10 AM 23° Mostly Clear 3% 10 mph NNE 66%
11 AM 24° Mostly Clear 3% 10 mph NNE 61%
12 PM 25° Mostly Clear 3% 10 mph NNE 55%
1 PM 26° Clear 3% 10 mph NNE 51%
2 PM 26° Clear 3% 10 mph NNE 50%
3 PM 26° Clear 3% 9 mph NNE 49%
4 PM 26° Clear 3% 9 mph NNE 48%
5 PM 29° Clear 3% 8 mph NNE 52%
15-Day Forecast
Today
7/27
Mostly Clear
25%
19°
32°
Tue
7/28
Mostly Clear
42%
17°
29°
Wed
7/29
Clear
6%
16°
31°
Thu
7/30
Partly Cloudy
41%
19°
34°
Fri
7/31
Mostly Cloudy
58%
18°
29°
Sat
8/1
Drizzle
64%
16°
31°
Sun
8/2
Clear
21%
16°
31°
Mon
8/3
Clear
10%
15°
32°
Tue
8/4
Clear
39%
19°
34°
Wed
8/5
Drizzle
46%
17°
33°
Thu
8/6
Drizzle
67%
16°
33°
Fri
8/7
Drizzle
60%
18°
33°
Sat
8/8
Rain
90%
17°
32°
Sun
8/9
Drizzle
60%
17°
32°
Mon
8/10
Drizzle
60%
17°
32°
52
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
52 AQI 9.5 µg/m³
O3
Ground-level ozone
41 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 52 Moderate 41 52
Wed 36 Good 31 36
Thu 54 Moderate 40 54
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 Mon Jul 27, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 80 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3046 J/kg
MLCAPE3604 J/kg
MUCAPE4167 J/kg
SBCIN-143 J/kg
MLCIN0 J/kg
Lifted Index-7.2
Kinematics
0–6 km Shear52 kt
0–1 km Shear16 kt
Eff. Shear53 kt
0–1 km SRH102
0–3 km SRH29
Eff. SRH29
Storm Motion277° @ 38 kt
0–1 km EHI1.9
Composite Parameters
Sig. Tornado2.3
STP (eff)0.3
Supercell3.2
K-Index26.6
Thermo & Levels
PWAT1.71 in
0–3 km LR6.0 °C/km
700–500 LR6.5 °C/km
Total Totals53.5
LCL896 hPa
LFC789 hPa
EL147 hPa
Freezing Lvl15,797 ft