Extreme Heat Warning — 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 8:00 PM

Boone County, Missouri, United States

Last updated: 5:13 AM CDT  ·  Refresh
25°C
Feels like 27°
Mostly Clear
▲ 34°  /  ▼ 25°
Wind
7 mph SSW
Humidity
76%
Dew Point
21°
Pressure
29.15 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
10%
Sunrise
6:19 AM
Sunset
8:09 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Boone County is currently mostly clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 4281 J/kg) — isolated convective development possible. Sunrise: 6:19AM · Sunset: 8:09PM.

Alerts

Extreme Heat Warning
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
Expires 8:00 PM
48 AQI · Good Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
3%
6 AM
24°
14%
7 AM
24°
14%
8 AM
26°
14%
9 AM
26°
14%
10 AM
27°
14%
11 AM
29°
14%
12 PM
30°
14%
1 PM
32°
3%
2 PM
33°
3%
3 PM
33°
4%
4 PM
33°
4%
5 PM
34°
5%
6 PM
33°
5%
7 PM
32°
8%
8 PM
31°
8%
9 PM
29°
8%
10 PM
29°
8%
11 PM
28°
8%
12 AM
27°
8%
1 AM
27°
8%
2 AM
27°
9%
3 AM
27°
9%
4 AM
26°
9%
7-Day Forecast
Today
34° 25°
Partly Cloudy.
Wed
36° 25°
Partly Cloudy with a 43% chance of rain.
Thu
34° 23°
Partly Cloudy with a 38% chance of rain.
Fri
34° 22°
Mostly Clear with a 23% chance of rain.
Sat
38° 24°
Mostly Clear.
Sun
35° 22°
Drizzle, 49% chance.
Mon
32° 21°
Clear with a 47% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 25° Mostly Clear 3% 7 mph SSW 76%
6 AM 24° Mostly Clear 14% 7 mph SSW 74%
7 AM 24° Mostly Clear 14% 7 mph SSW 76%
8 AM 26° Partly Cloudy 14% 8 mph SW 73%
9 AM 26° Partly Cloudy 14% 11 mph SW 68%
10 AM 27° Mostly Clear 14% 12 mph SW 64%
11 AM 29° Partly Cloudy 14% 12 mph SW 61%
12 PM 30° Partly Cloudy 14% 12 mph SW 58%
1 PM 32° Partly Cloudy 3% 12 mph SW 55%
2 PM 33° Partly Cloudy 3% 11 mph SW 53%
3 PM 33° Mostly Cloudy 4% 10 mph SW 52%
4 PM 33° Mostly Cloudy 4% 9 mph SW 53%
5 PM 34° Mostly Cloudy 5% 8 mph SW 57%
6 PM 33° Mostly Cloudy 5% 6 mph SW 62%
7 PM 32° Partly Cloudy 8% 6 mph SSW 66%
8 PM 31° Partly Cloudy 8% 6 mph SSW 68%
9 PM 29° Partly Cloudy 8% 6 mph S 68%
10 PM 29° Partly Cloudy 8% 7 mph S 69%
11 PM 28° Partly Cloudy 8% 7 mph S 70%
12 AM 27° Partly Cloudy 8% 7 mph S 70%
1 AM 27° Mostly Clear 8% 7 mph S 71%
2 AM 27° Partly Cloudy 9% 7 mph S 70%
3 AM 27° Partly Cloudy 9% 7 mph SSW 70%
4 AM 26° Mostly Clear 9% 7 mph SSW 70%
15-Day Forecast
Today
8/11
Partly Cloudy
14%
25°
34°
Wed
8/12
Partly Cloudy
43%
25°
36°
Thu
8/13
Partly Cloudy
38%
23°
34°
Fri
8/14
Mostly Clear
23%
22°
34°
Sat
8/15
Mostly Clear
15%
24°
38°
Sun
8/16
Drizzle
49%
22°
35°
Mon
8/17
Clear
47%
21°
32°
Tue
8/18
Clear
34%
22°
38°
Wed
8/19
Mostly Cloudy
35%
24°
37°
Thu
8/20
Mostly Clear
32%
23°
39°
Fri
8/21
Clear
60%
21°
39°
Sat
8/22
Drizzle
60%
21°
35°
Sun
8/23
Clear
60%
21°
35°
Mon
8/24
Drizzle
60%
20°
33°
Tue
8/25
Drizzle
60%
19°
32°
48
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
48 AQI 8.7 µg/m³
O3
Ground-level ozone
30 AQI 32 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 48 Good 30 48
Wed 30 Good 30 27
Thu 45 Good 31 45
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 Aug 11, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1212 J/kg
MLCAPE1472 J/kg
MUCAPE1923 J/kg
SBCIN-634 J/kg
MLCIN0 J/kg
Lifted Index-4.4
Kinematics
0–6 km Shear14 kt
0–1 km Shear24 kt
Eff. Shear—
0–1 km SRH161
0–3 km SRH120
Eff. SRH—
Storm Motion313° @ 17 kt
0–1 km EHI1.2
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index20.0
Thermo & Levels
PWAT1.35 in
0–3 km LR3.8 °C/km
700–500 LR8.1 °C/km
Total Totals50.7
LCL936 hPa
LFC636 hPa
EL199 hPa
Freezing Lvl14,446 ft