Heat Advisory — Clinton, IL, Washington, IL, Randolph, IL, Madison, IL, St. Clair, IL, Monroe, IL, Boone, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Gasconade, MO, Warren, MO, St. Charles, MO, Franklin, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO 7:00 PM

Madison County, Missouri, United States

Last updated: 5:30 PM CDT  ·  Refresh
32°C
Feels like 36°
Clear
▲ 35°  /  ▼ 17°
Wind
9 mph NW
Humidity
52%
Dew Point
22°
Pressure
28.83 inHg
Visibility
10 mi
UV Index
6.2
Cloud Cover
9%
Sunrise
5:56 AM
Sunset
8:18 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Madison County is currently clear at 32°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 1737 J/kg) — isolated convective development possible. Sunrise: 5:56AM · Sunset: 8:18PM.

Alerts

Heat Advisory
Clinton, IL, Washington, IL, Randolph, IL, Madison, IL, St. Clair, IL, Monroe, IL, Boone, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Gasconade, MO, Warren, MO, St. Charles, MO, Franklin, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO, Crawford, MO, Washington, MO, St. Francois, MO, Ste. Genevieve, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 7:00 PM
40 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
32°
6%
6 PM
31°
25%
7 PM
29°
23%
8 PM
28°
16%
9 PM
26°
16%
10 PM
24°
15%
11 PM
23°
15%
12 AM
22°
15%
1 AM
21°
3%
2 AM
21°
3%
3 AM
19°
3%
4 AM
19°
3%
5 AM
17°
3%
6 AM
17°
3%
7 AM
18°
3%
8 AM
19°
3%
9 AM
22°
3%
10 AM
22°
3%
11 AM
23°
3%
12 PM
26°
3%
1 PM
26°
3%
2 PM
26°
3%
3 PM
26°
3%
4 PM
26°
3%
7-Day Forecast
Today
35° 17°
Clear.
Wed
31° 17°
Mostly Clear.
Thu
27° 16°
Mostly Clear.
Fri
25° 16°
Overcast with a 66% chance of rain.
Sat
31° 17°
Mostly Cloudy with a 53% chance of rain.
Sun
36° 21°
Partly Cloudy.
Mon
36° 22°
Mostly Clear.
TimeTempConditionsPrecipWindHumidity
Now 32° Clear 6% 9 mph NW 52%
6 PM 31° Clear 25% 9 mph NW 56%
7 PM 29° Clear 23% 8 mph NNW 61%
8 PM 28° Clear 16% 7 mph NNW 65%
9 PM 26° Clear 16% 7 mph N 68%
10 PM 24° Clear 15% 7 mph N 70%
11 PM 23° Clear 15% 7 mph N 72%
12 AM 22° Clear 15% 8 mph N 75%
1 AM 21° Clear 3% 7 mph N 78%
2 AM 21° Clear 3% 7 mph N 80%
3 AM 19° Clear 3% 6 mph N 82%
4 AM 19° Clear 3% 6 mph N 83%
5 AM 17° Clear 3% 6 mph N 84%
6 AM 17° Clear 3% 6 mph N 84%
7 AM 18° Clear 3% 7 mph N 81%
8 AM 19° Clear 3% 8 mph N 76%
9 AM 22° Clear 3% 8 mph N 71%
10 AM 22° Clear 3% 8 mph N 67%
11 AM 23° Mostly Clear 3% 8 mph N 63%
12 PM 26° Mostly Clear 3% 9 mph N 60%
1 PM 26° Mostly Clear 3% 9 mph NNE 58%
2 PM 26° Mostly Clear 3% 9 mph NNE 58%
3 PM 26° Partly Cloudy 3% 9 mph NNE 58%
4 PM 26° Partly Cloudy 3% 8 mph NNE 60%
15-Day Forecast
Today
7/21
Clear
16%
17°
35°
Wed
7/22
Mostly Clear
3%
17°
31°
Thu
7/23
Mostly Clear
7%
16°
27°
Fri
7/24
Overcast
66%
16°
25°
Sat
7/25
Mostly Cloudy
53%
17°
31°
Sun
7/26
Partly Cloudy
16%
21°
36°
Mon
7/27
Mostly Clear
17%
22°
36°
Tue
7/28
Mostly Clear
43%
20°
32°
Wed
7/29
Clear
43%
19°
31°
Thu
7/30
Drizzle
51%
19°
32°
Fri
7/31
Drizzle
60%
20°
31°
Sat
8/1
Drizzle
60%
19°
31°
Sun
8/2
Clear
60%
20°
32°
Mon
8/3
Clear
60%
20°
33°
Tue
8/4
Drizzle
60%
21°
32°
40
Good
U.S. Air Quality Index · Dominant: O3
50 100 150 200

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

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
37 AQI 6.8 µg/m³
O3
Ground-level ozone
Dominant
40 AQI 43 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Wed 40 Good 40 37
Thu 37 Good 37 27
Fri 34 Good 34 14
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 Tue Jul 21, 21:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE2020 J/kg
MLCAPE973 J/kg
MUCAPE2020 J/kg
SBCIN-68 J/kg
MLCIN0 J/kg
Lifted Index-3.2
Kinematics
0–6 km Shear33 kt
0–1 km Shear6 kt
Eff. Shear33 kt
0–1 km SRH-13
0–3 km SRH-100
Eff. SRH-100
Storm Motion278° @ 31 kt
0–1 km EHI-0.2
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index30.4
Thermo & Levels
PWAT1.70 in
0–3 km LR6.6 °C/km
700–500 LR5.7 °C/km
Total Totals40.4
LCL843 hPa
LFC708 hPa
EL148 hPa
Freezing Lvl16,362 ft