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

Franklin County, Missouri, United States

Last updated: 5:14 AM CDT  ·  Refresh
25°C
Feels like 27°
Mostly Clear
▲ 35°  /  ▼ 24°
Wind
7 mph SW
Humidity
72%
Dew Point
21°
Pressure
29.23 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
11%
Sunrise
6:15 AM
Sunset
8:03 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Franklin County is currently mostly clear at 25°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2890 J/kg) — isolated convective development possible. Sunrise: 6:15AM · Sunset: 8:03PM.

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
34 AQI · Good Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
25°
4%
6 AM
23°
19%
7 AM
24°
20%
8 AM
26°
20%
9 AM
27°
20%
10 AM
29°
20%
11 AM
31°
20%
12 PM
32°
14%
1 PM
34°
3%
2 PM
34°
4%
3 PM
35°
4%
4 PM
34°
4%
5 PM
34°
5%
6 PM
33°
8%
7 PM
32°
13%
8 PM
31°
21%
9 PM
29°
22%
10 PM
28°
22%
11 PM
28°
22%
12 AM
27°
23%
1 AM
27°
23%
2 AM
27°
24%
3 AM
27°
24%
4 AM
27°
24%
7-Day Forecast
Today
35° 24°
Mostly Clear with a 22% chance of rain.
Wed
38° 24°
Partly Cloudy with a 50% chance of rain.
Thu
37° 24°
Partly Cloudy with a 25% chance of rain.
Fri
36° 23°
Clear.
Sat
40° 23°
Mostly Clear.
Sun
39° 22°
Drizzle, 59% chance.
Mon
34° 21°
Mostly Clear with a 39% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 25° Mostly Clear 4% 7 mph SW 72%
6 AM 23° Mostly Clear 19% 8 mph SW 72%
7 AM 24° Mostly Clear 20% 8 mph SW 72%
8 AM 26° Mostly Clear 20% 9 mph SW 67%
9 AM 27° Mostly Clear 20% 10 mph SW 62%
10 AM 29° Mostly Clear 20% 10 mph SW 57%
11 AM 31° Mostly Clear 20% 10 mph SW 54%
12 PM 32° Clear 14% 10 mph SW 50%
1 PM 34° Clear 3% 10 mph SW 46%
2 PM 34° Mostly Clear 4% 9 mph SW 45%
3 PM 35° Mostly Clear 4% 9 mph SW 44%
4 PM 34° Partly Cloudy 4% 9 mph SW 43%
5 PM 34° Partly Cloudy 5% 8 mph SW 47%
6 PM 33° Mostly Cloudy 8% 7 mph SSW 51%
7 PM 32° Mostly Cloudy 13% 6 mph SSW 56%
8 PM 31° Mostly Cloudy 21% 6 mph SSW 59%
9 PM 29° Partly Cloudy 22% 6 mph SSW 61%
10 PM 28° Partly Cloudy 22% 6 mph SSW 63%
11 PM 28° Partly Cloudy 22% 6 mph SSW 65%
12 AM 27° Partly Cloudy 23% 6 mph SSW 66%
1 AM 27° Partly Cloudy 23% 6 mph SSW 68%
2 AM 27° Partly Cloudy 24% 6 mph SSW 68%
3 AM 27° Partly Cloudy 24% 6 mph SSW 68%
4 AM 27° Mostly Clear 24% 7 mph SSW 69%
15-Day Forecast
Today
8/11
Mostly Clear
22%
24°
35°
Wed
8/12
Partly Cloudy
50%
24°
38°
Thu
8/13
Partly Cloudy
25%
24°
37°
Fri
8/14
Clear
15%
23°
36°
Sat
8/15
Mostly Clear
15%
23°
40°
Sun
8/16
Drizzle
59%
22°
39°
Mon
8/17
Mostly Clear
39%
21°
34°
Tue
8/18
Rain
53%
19°
39°
Wed
8/19
Drizzle
54%
22°
39°
Thu
8/20
Mostly Clear
35%
23°
39°
Fri
8/21
Clear
60%
21°
39°
Sat
8/22
Drizzle
60%
21°
36°
Sun
8/23
Clear
60%
21°
36°
Mon
8/24
Drizzle
60%
20°
33°
Tue
8/25
Drizzle
60%
19°
33°
34
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
34 AQI 6.2 µg/m³
O3
Ground-level ozone
Dominant
34 AQI 37 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 34 Good 34 34
Wed 35 Good 35 18
Thu 31 Good 31 27
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, 09:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1082 J/kg
MLCAPE1214 J/kg
MUCAPE1315 J/kg
SBCIN-539 J/kg
MLCIN0 J/kg
Lifted Index-5.3
Kinematics
0–6 km Shear17 kt
0–1 km Shear18 kt
Eff. Shear13 kt
0–1 km SRH148
0–3 km SRH125
Eff. SRH-31
Storm Motion311° @ 16 kt
0–1 km EHI1.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index28.3
Thermo & Levels
PWAT1.53 in
0–3 km LR4.1 °C/km
700–500 LR8.3 °C/km
Total Totals55.2
LCL929 hPa
LFC635 hPa
EL216 hPa
Freezing Lvl14,600 ft