Saint Louis, Missouri

Last updated: 3:30 PM CDT  ·  Refresh
33°C
Feels like 36°
Partly Cloudy
▲ 33°  /  ▼ 22°
Wind
6 mph ENE
Humidity
48%
Dew Point
20°
Pressure
29.55 inHg
Visibility
10 mi
UV Index
8.2
Cloud Cover
39%
Sunrise
5:48 AM
Sunset
8:24 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Louis is currently partly cloudy at 33°C. Precipitation is likely — peak probability 70% around 3 PM. Atmospheric instability is elevated (CAPE up to 2088 J/kg) — isolated convective development possible. Sunrise: 5:48AM · Sunset: 8:24PM.

Alerts

No active alerts for this location.
52 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
8%
4 PM
33°
29%
5 PM
33°
8%
6 PM
33°
8%
7 PM
32°
5%
8 PM
30°
5%
9 PM
29°
5%
10 PM
28°
5%
11 PM
27°
3%
12 AM
27°
3%
1 AM
26°
14%
2 AM
26°
33%
3 AM
25°
33%
4 AM
25°
34%
5 AM
24°
34%
6 AM
24°
38%
7 AM
25°
39%
8 AM
26°
45%
9 AM
27°
45%
10 AM
29°
58%
11 AM
29°
59%
12 PM
30°
59%
1 PM
30°
68%
2 PM
29°
68%
7-Day Forecast
Today
33° 22°
Partly Cloudy.
Thu
32° 24°
Rain, 70% chance.
Fri
35° 23°
Clear with a 48% chance of rain.
Sat
34° 24°
Mostly Clear with a 29% chance of rain.
Sun
30° 21°
Clear.
Mon
33° 21°
Clear with a 35% chance of rain.
Tue
33° 22°
Clear with a 35% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 33° Partly Cloudy 8% 6 mph ENE 48%
4 PM 33° Partly Cloudy 29% 5 mph E 48%
5 PM 33° Mostly Cloudy 8% 5 mph E 51%
6 PM 33° Partly Cloudy 8% 4 mph E 55%
7 PM 32° Mostly Clear 5% 4 mph ESE 59%
8 PM 30° Mostly Clear 5% 3 mph ESE 64%
9 PM 29° Clear 5% 2 mph ESE 68%
10 PM 28° Clear 5% 2 mph SE 72%
11 PM 27° Clear 3% 2 mph S 76%
12 AM 27° Mostly Clear 3% 3 mph SW 80%
1 AM 26° Mostly Clear 14% 3 mph WSW 83%
2 AM 26° Mostly Clear 33% 2 mph WSW 86%
3 AM 25° Partly Cloudy 33% 2 mph WSW 88%
4 AM 25° Partly Cloudy 34% 2 mph WSW 89%
5 AM 24° Partly Cloudy 34% 2 mph W 88%
6 AM 24° Mostly Clear 38% 2 mph W 87%
7 AM 25° Mostly Clear 39% 2 mph WSW 84%
8 AM 26° Mostly Clear 45% 2 mph WSW 80%
9 AM 27° Mostly Clear 45% 2 mph SW 76%
10 AM 29° Partly Cloudy 58% 2 mph SW 72%
11 AM 29° Partly Cloudy 59% 2 mph S 70%
12 PM 30° Rain 59% 2 mph SE 68%
1 PM 30° Rain 68% 2 mph SE 68%
2 PM 29° Rain 68% 1 mph S 70%
15-Day Forecast
Today
7/15
Partly Cloudy
8%
22°
33°
Thu
7/16
Rain
70%
24°
32°
Fri
7/17
Clear
48%
23°
35°
Sat
7/18
Mostly Clear
29%
24°
34°
Sun
7/19
Clear
19%
21°
30°
Mon
7/20
Clear
35%
21°
33°
Tue
7/21
Clear
35%
22°
33°
Wed
7/22
Clear
60%
20°
29°
Thu
7/23
Drizzle
60%
20°
32°
Fri
7/24
Drizzle
60%
21°
32°
Sat
7/25
Drizzle
60%
18°
32°
Sun
7/26
Drizzle
60%
23°
33°
Mon
7/27
Drizzle
60%
22°
33°
Tue
7/28
Drizzle
60%
23°
33°
Wed
7/29
Drizzle
60%
23°
33°
52
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
52 AQI 9.9 µg/m³
O3
Ground-level ozone
51 AQI 55 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 52 Moderate 51 52
Fri 50 Good 50 50
Sat 59 Moderate 47 59
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 Wed Jul 15, 19:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1443 J/kg
MLCAPE519 J/kg
MUCAPE1443 J/kg
SBCIN0 J/kg
MLCIN0 J/kg
Lifted Index-1.8
Kinematics
0–6 km Shear20 kt
0–1 km Shear1 kt
Eff. Shear21 kt
0–1 km SRH-0
0–3 km SRH-18
Eff. SRH-18
Storm Motion67° @ 21 kt
0–1 km EHI-0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index27.4
Thermo & Levels
PWAT1.67 in
0–3 km LR8.0 °C/km
700–500 LR4.8 °C/km
Total Totals39.0
LCL833 hPa
LFC1001 hPa
EL191 hPa
Freezing Lvl16,752 ft