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

Waukesha County, Wisconsin, United States

Last updated: 6:06 PM CDT  ·  Refresh
27°C
Feels like 29°
Rain
▲ 31°  /  ▼ 18°
Wind
12 mph SSW
Humidity
74%
Dew Point
24°
Pressure
28.69 inHg
Visibility
8 mi
UV Index
4.5
Cloud Cover
50%
Sunrise
5:38 AM
Sunset
8:19 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Waukesha County is currently rain at 27°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2705 J/kg) — isolated convective development possible. Sunrise: 5:38AM · Sunset: 8:19PM.

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
54 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
27°
28%
7 PM
28°
23%
8 PM
28°
23%
9 PM
27°
25%
10 PM
26°
25%
11 PM
25°
18%
12 AM
24°
25%
1 AM
22°
14%
2 AM
21°
14%
3 AM
21°
3%
4 AM
21°
13%
5 AM
18°
3%
6 AM
18°
3%
7 AM
19°
3%
8 AM
20°
3%
9 AM
22°
3%
10 AM
23°
3%
11 AM
23°
3%
12 PM
24°
3%
1 PM
23°
3%
2 PM
23°
3%
3 PM
23°
3%
4 PM
23°
3%
5 PM
27°
3%
7-Day Forecast
Tonight
31° 18°
Rain, 28% chance.
Tue
27° 17°
Mostly Clear with a 25% chance of rain.
Wed
30° 17°
Clear.
Thu
32° 18°
Mostly Clear with a 45% chance of rain.
Fri
28° 18°
Mostly Cloudy with a 58% chance of rain.
Sat
29° 17°
Drizzle, 56% chance.
Sun
29° 16°
Partly Cloudy with a 21% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 27° Rain 28% 12 mph SSW 74%
7 PM 28° Clear 23% 11 mph SW 79%
8 PM 28° Mostly Clear 23% 8 mph WSW 83%
9 PM 27° Mostly Clear 25% 7 mph NW 87%
10 PM 26° Mostly Clear 25% 7 mph NNW 90%
11 PM 25° Partly Cloudy 18% 8 mph N 90%
12 AM 24° Mostly Cloudy 25% 10 mph N 91%
1 AM 22° Partly Cloudy 14% 12 mph NNE 92%
2 AM 21° Partly Cloudy 14% 11 mph NNE 93%
3 AM 21° Partly Cloudy 3% 9 mph N 94%
4 AM 21° Partly Cloudy 13% 8 mph N 94%
5 AM 18° Partly Cloudy 3% 9 mph N 90%
6 AM 18° Mostly Cloudy 3% 9 mph N 87%
7 AM 19° Partly Cloudy 3% 10 mph N 83%
8 AM 20° Partly Cloudy 3% 11 mph NNE 77%
9 AM 22° Partly Cloudy 3% 11 mph NNE 71%
10 AM 23° Partly Cloudy 3% 12 mph NNE 65%
11 AM 23° Mostly Clear 3% 11 mph NNE 60%
12 PM 24° Mostly Clear 3% 11 mph NNE 56%
1 PM 23° Clear 3% 11 mph NNE 52%
2 PM 23° Clear 3% 11 mph NNE 51%
3 PM 23° Clear 3% 11 mph NNE 50%
4 PM 23° Clear 3% 10 mph NNE 49%
5 PM 27° Clear 3% 9 mph NNE 53%
15-Day Forecast
Today
7/27
Rain
28%
18°
31°
Tue
7/28
Mostly Clear
25%
17°
27°
Wed
7/29
Clear
19%
17°
30°
Thu
7/30
Mostly Clear
45%
18°
32°
Fri
7/31
Mostly Cloudy
58%
18°
28°
Sat
8/1
Drizzle
56%
17°
29°
Sun
8/2
Partly Cloudy
21%
16°
29°
Mon
8/3
Clear
13%
16°
30°
Tue
8/4
Drizzle
46%
19°
33°
Wed
8/5
Drizzle
58%
18°
32°
Thu
8/6
Drizzle
67%
17°
31°
Fri
8/7
Drizzle
60%
18°
31°
Sat
8/8
Rain
90%
18°
29°
Sun
8/9
Drizzle
60%
18°
30°
Mon
8/10
Drizzle
60%
17°
30°
54
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
54 AQI 10.7 µg/m³
O3
Ground-level ozone
40 AQI 44 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Tue 54 Moderate 40 54
Wed 32 Good 32 32
Thu 56 Moderate 44 56
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
SBCAPE2222 J/kg
MLCAPE3025 J/kg
MUCAPE3848 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-5.8
Kinematics
0–6 km Shear56 kt
0–1 km Shear23 kt
Eff. Shear52 kt
0–1 km SRH192
0–3 km SRH116
Eff. SRH116
Storm Motion278° @ 39 kt
0–1 km EHI2.7
Composite Parameters
Sig. Tornado4.2
STP (eff)2.4
Supercell12.0
K-Index26.3
Thermo & Levels
PWAT1.70 in
0–3 km LR5.1 °C/km
700–500 LR6.5 °C/km
Total Totals52.9
LCL922 hPa
LFC971 hPa
EL178 hPa
Freezing Lvl15,837 ft