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: 7:32 PM CDT  ·  Refresh
29°C
Feels like 34°
Mostly Clear
▲ 32°  /  ▼ 19°
Wind
10 mph SW
Humidity
76%
Dew Point
24°
Pressure
28.77 inHg
Visibility
10 mi
UV Index
2.1
Cloud Cover
15%
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 29°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2960 J/kg) — isolated convective development possible. Sunrise: 5:40AM · Sunset: 8:21PM.

Alerts

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
29°
13%
8 PM
27°
31%
9 PM
27°
23%
10 PM
26°
21%
11 PM
24°
23%
12 AM
24°
33%
1 AM
22°
23%
2 AM
22°
15%
3 AM
21°
15%
4 AM
21°
15%
5 AM
19°
3%
6 AM
19°
3%
7 AM
19°
3%
8 AM
21°
3%
9 AM
23°
3%
10 AM
24°
3%
11 AM
25°
3%
12 PM
26°
3%
1 PM
26°
3%
2 PM
27°
3%
3 PM
27°
3%
4 PM
27°
3%
5 PM
28°
3%
6 PM
27°
3%
7-Day Forecast
Tonight
32° 19°
Mostly Clear with a 21% chance of rain.
Tue
28° 17°
Mostly Clear with a 23% chance of rain.
Wed
31° 16°
Clear.
Thu
34° 19°
Partly Cloudy.
Fri
29° 18°
Rain, 64% chance.
Sat
32° 16°
Rain, 64% chance.
Sun
31° 14°
Clear.
TimeTempConditionsPrecipWindHumidity
Now 29° Mostly Clear 13% 10 mph SW 76%
8 PM 27° Clear 31% 7 mph SW 83%
9 PM 27° Clear 23% 6 mph W 84%
10 PM 26° Mostly Clear 21% 6 mph NW 85%
11 PM 24° Mostly Clear 23% 8 mph NNW 88%
12 AM 24° Mostly Cloudy 33% 10 mph N 91%
1 AM 22° Mostly Cloudy 23% 11 mph N 93%
2 AM 22° Mostly Cloudy 15% 11 mph N 93%
3 AM 21° Mostly Cloudy 15% 10 mph N 93%
4 AM 21° Mostly Cloudy 15% 10 mph NNE 92%
5 AM 19° Partly Cloudy 3% 10 mph N 90%
6 AM 19° Partly Cloudy 3% 10 mph N 88%
7 AM 19° Partly Cloudy 3% 11 mph N 83%
8 AM 21° Partly Cloudy 3% 11 mph NNE 76%
9 AM 23° Mostly Clear 3% 11 mph NNE 68%
10 AM 24° Mostly Clear 3% 11 mph NNE 62%
11 AM 25° Clear 3% 11 mph NNE 57%
12 PM 26° Clear 3% 11 mph NNE 52%
1 PM 26° Clear 3% 10 mph NNE 49%
2 PM 27° Clear 3% 10 mph NNE 48%
3 PM 27° Clear 3% 9 mph NNE 47%
4 PM 27° Clear 3% 9 mph NNE 49%
5 PM 28° Clear 3% 8 mph NNE 53%
6 PM 27° Clear 3% 8 mph NE 58%
15-Day Forecast
Today
7/27
Mostly Clear
21%
19°
32°
Tue
7/28
Mostly Clear
23%
17°
28°
Wed
7/29
Clear
7%
16°
31°
Thu
7/30
Partly Cloudy
14%
19°
34°
Fri
7/31
Rain
64%
18°
29°
Sat
8/1
Rain
64%
16°
32°
Sun
8/2
Clear
17%
14°
31°
Mon
8/3
Clear
8%
14°
32°
Tue
8/4
Drizzle
43%
17°
34°
Wed
8/5
Drizzle
44%
18°
33°
Thu
8/6
Drizzle
60%
17°
30°
Fri
8/7
Drizzle
60%
18°
33°
Sat
8/8
Rain
90%
17°
31°
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
Today 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, 23:00'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
SBCAPE3058 J/kg
MLCAPE3219 J/kg
MUCAPE3770 J/kg
SBCIN-123 J/kg
MLCIN0 J/kg
Lifted Index-7.8
Kinematics
0–6 km Shear57 kt
0–1 km Shear16 kt
Eff. Shear57 kt
0–1 km SRH-7
0–3 km SRH-45
Eff. SRH-45
Storm Motion279° @ 36 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index29.1
Thermo & Levels
PWAT1.69 in
0–3 km LR6.1 °C/km
700–500 LR6.3 °C/km
Total Totals52.4
LCL908 hPa
LFC800 hPa
EL152 hPa
Freezing Lvl15,794 ft