Excessive Heat Watch 12:00 AM Heat Advisory — Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Boone, MO, Audrain, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Crawford, MO, Washington, MO, St. Francois, MO, Iron, MO, Madison, MO, Reynolds, MO, Warren, MO, St. Charles, MO, Franklin, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO, Ste. Genevieve, MO 10:00 PM Excessive Heat Warning — 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, Ste. Genevieve, MO, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Audrain, MO, Lincoln, MO, Crawford, MO, Washington, MO, St. Francois, MO, Iron, MO, Madison, MO, Reynolds, MO 8:00 PM

Washington County, Missouri, United States

Last updated: 6:54 PM CDT  ·  Refresh
31°C
Feels like 36°
Mostly Clear
▲ 34°  /  ▼ 22°
Wind
6 mph S
Humidity
64%
Dew Point
23°
Pressure
29.00 inHg
Visibility
10 mi
UV Index
4.0
Cloud Cover
20%
Sunrise
5:45 AM
Sunset
8:29 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Washington County is currently mostly clear at 31°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2658 J/kg) — isolated convective development possible. Sunrise: 5:45AM · Sunset: 8:29PM.

Alerts

Excessive Heat Watch
Expires 12:00 AM
Heat Advisory
Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Boone, MO, Audrain, MO, Moniteau, MO, Cole, MO, Osage, MO, Callaway, MO, Montgomery, MO, Lincoln, MO, Gasconade, MO, Crawford, MO, Washington, MO, St. Francois, MO, Iron, MO, Madison, MO, Reynolds, MO, Warren, MO, St. Charles, MO, Franklin, MO, St. Louis, MO, St. Louis City, MO, Jefferson, MO, Ste. Genevieve, MO
Expires 10:00 PM
Excessive Heat Warning
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, Ste. Genevieve, MO, Knox, MO, Lewis, MO, Shelby, MO, Marion, MO, Monroe, MO, Ralls, MO, Pike, MO, Audrain, MO, Lincoln, MO, Crawford, MO, Washington, MO, St. Francois, MO, Iron, MO, Madison, MO, Reynolds, MO
Expires 8:00 PM
57 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
31°
16%
7 PM
30°
27%
8 PM
29°
29%
9 PM
27°
16%
10 PM
26°
16%
11 PM
25°
16%
12 AM
24°
4%
1 AM
24°
4%
2 AM
24°
8%
3 AM
23°
8%
4 AM
24°
8%
5 AM
22°
8%
6 AM
22°
8%
7 AM
24°
8%
8 AM
26°
14%
9 AM
28°
10%
10 AM
29°
11%
11 AM
30°
20%
12 PM
31°
9%
1 PM
34°
9%
2 PM
33°
9%
3 PM
33°
9%
4 PM
33°
12%
5 PM
32°
5%
7-Day Forecast
Tonight
34° 22°
Mostly Clear.
Fri
35° 22°
Mostly Clear.
Sat
35° 22°
Partly Cloudy with a 27% chance of rain.
Sun
33° 20°
Partly Cloudy with a 40% chance of rain.
Mon
34° 19°
Drizzle, 60% chance.
Tue
33° 18°
Rain, 77% chance.
Wed
34° 19°
Rain, 63% chance.
TimeTempConditionsPrecipWindHumidity
Now 31° Mostly Clear 16% 6 mph S 64%
7 PM 30° Partly Cloudy 27% 4 mph S 68%
8 PM 29° Partly Cloudy 29% 5 mph S 70%
9 PM 27° Partly Cloudy 16% 6 mph SSE 71%
10 PM 26° Partly Cloudy 16% 6 mph S 75%
11 PM 25° Partly Cloudy 16% 6 mph S 78%
12 AM 24° Mostly Cloudy 4% 6 mph SSW 82%
1 AM 24° Partly Cloudy 4% 6 mph SSW 82%
2 AM 24° Partly Cloudy 8% 5 mph SSW 82%
3 AM 23° Partly Cloudy 8% 5 mph SSW 83%
4 AM 24° Mostly Clear 8% 4 mph SSW 83%
5 AM 22° Mostly Clear 8% 4 mph SSW 84%
6 AM 22° Clear 8% 4 mph SSW 84%
7 AM 24° Clear 8% 5 mph SSW 78%
8 AM 26° Mostly Clear 14% 5 mph SSW 71%
9 AM 28° Mostly Clear 10% 6 mph SSW 63%
10 AM 29° Mostly Clear 11% 6 mph SSW 58%
11 AM 30° Partly Cloudy 20% 6 mph SSW 54%
12 PM 31° Partly Cloudy 9% 6 mph SSW 50%
1 PM 34° Partly Cloudy 9% 6 mph SSW 49%
2 PM 33° Partly Cloudy 9% 6 mph SSW 49%
3 PM 33° Partly Cloudy 9% 6 mph SSW 49%
4 PM 33° Partly Cloudy 12% 6 mph SSW 53%
5 PM 32° Mostly Clear 5% 6 mph SSW 57%
15-Day Forecast
Today
7/2
Mostly Clear
16%
22°
34°
Fri
7/3
Mostly Clear
10%
22°
35°
Sat
7/4
Partly Cloudy
27%
22°
35°
Sun
7/5
Partly Cloudy
40%
20°
33°
Mon
7/6
Drizzle
60%
19°
34°
Tue
7/7
Rain
77%
18°
33°
Wed
7/8
Rain
63%
19°
34°
Thu
7/9
Rain
63%
22°
34°
Fri
7/10
Rain
68%
20°
34°
Sat
7/11
Drizzle
68%
21°
35°
Sun
7/12
Rain
68%
19°
32°
Mon
7/13
Drizzle
60%
19°
33°
Tue
7/14
Drizzle
60%
19°
33°
Wed
7/15
Clear
60%
19°
33°
Thu
7/16
Drizzle
60%
20°
34°
57
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
57 AQI 12.3 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Fri 57 Moderate 31 57
Sat 55 Moderate 27 55
Sun 56 Moderate 28 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 Thu Jul 2, 22:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3043 J/kg
MLCAPE2885 J/kg
MUCAPE3144 J/kg
SBCIN-62 J/kg
MLCIN0 J/kg
Lifted Index-6.3
Kinematics
0–6 km Shear4 kt
0–1 km Shear9 kt
Eff. Shear6 kt
0–1 km SRH-21
0–3 km SRH-27
Eff. SRH-27
Storm Motion168° @ 23 kt
0–1 km EHI-0.4
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index33.2
Thermo & Levels
PWAT1.77 in
0–3 km LR6.9 °C/km
700–500 LR6.0 °C/km
Total Totals49.4
LCL873 hPa
LFC810 hPa
EL146 hPa
Freezing Lvl14,833 ft