Heat Advisory — Mason, MI, Lake, MI, Osceola, MI, Clare, MI, Oceana, MI, Newaygo, MI, Mecosta, MI, Isabella, MI, Muskegon, MI, Montcalm, MI, Gratiot, MI, Ottawa, MI, Kent, MI, Ionia, MI, Clinton, MI, Allegan, MI, Barry, MI, Eaton, MI, Ingham, MI, Van Buren, MI, Kalamazoo, MI, Calhoun, MI, Jackson, MI 7:00 PM Excessive Heat Warning — Burnett, WI, Washburn, WI, Sawyer, WI, Douglas, WI, Bayfield, WI, Ashland, WI, Iron, WI, Koochiching, MN, North St. Louis, MN, Northern Cook/Northern Lake, MN, North Itasca, MN, Central St. Louis, MN, Southern Lake/North Shore, MN, Southern Cook/North Shore, MN, South Itasca, MN, Price, WI 9:00 PM

Saint Louis, Michigan

Last updated: 5:06 PM CDT  ·  Refresh
33°C
Feels like 37°
Mostly Clear
▲ 34°  /  ▼ 17°
Wind
7 mph NNW
Humidity
47%
Dew Point
22°
Pressure
29.18 inHg
Visibility
10 mi
UV Index
6.2
Cloud Cover
22%
Sunrise
6:11 AM
Sunset
9:16 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Saint Louis is currently mostly clear at 33°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2405 J/kg) — isolated convective development possible. Sunrise: 6:11AM · Sunset: 9:16PM.

Alerts

Heat Advisory
Mason, MI, Lake, MI, Osceola, MI, Clare, MI, Oceana, MI, Newaygo, MI, Mecosta, MI, Isabella, MI, Muskegon, MI, Montcalm, MI, Gratiot, MI, Ottawa, MI, Kent, MI, Ionia, MI, Clinton, MI, Allegan, MI, Barry, MI, Eaton, MI, Ingham, MI, Van Buren, MI, Kalamazoo, MI, Calhoun, MI, Jackson, MI
Expires 7:00 PM
Excessive Heat Warning
Burnett, WI, Washburn, WI, Sawyer, WI, Douglas, WI, Bayfield, WI, Ashland, WI, Iron, WI, Koochiching, MN, North St. Louis, MN, Northern Cook/Northern Lake, MN, North Itasca, MN, Central St. Louis, MN, Southern Lake/North Shore, MN, Southern Cook/North Shore, MN, South Itasca, MN, Price, WI
Expires 9:00 PM
162 AQI · Unhealthy Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
33°
3%
7 PM
34°
23%
8 PM
32°
23%
9 PM
30°
16%
10 PM
27°
16%
11 PM
24°
16%
12 AM
23°
16%
1 AM
22°
16%
2 AM
21°
3%
3 AM
20°
3%
4 AM
19°
3%
5 AM
19°
3%
6 AM
18°
3%
7 AM
18°
3%
8 AM
19°
3%
9 AM
22°
3%
10 AM
23°
3%
11 AM
25°
3%
12 PM
26°
3%
1 PM
28°
3%
2 PM
29°
3%
3 PM
30°
3%
4 PM
30°
3%
5 PM
32°
3%
7-Day Forecast
Tonight
34° 17°
Mostly Clear.
Thu
33° 17°
Mostly Clear.
Fri
32° 18°
Partly Cloudy.
Sat
30° 16°
Mostly Clear with a 60% chance of rain.
Sun
27° 14°
Partly Cloudy with a 30% chance of rain.
Mon
30° 14°
Drizzle, 60% chance.
Tue
27° 14°
Partly Cloudy with a 60% chance of rain.
TimeTempConditionsPrecipWindHumidity
Now 33° Mostly Clear 3% 7 mph NNW 47%
7 PM 34° Partly Cloudy 23% 8 mph N 49%
8 PM 32° Mostly Clear 23% 9 mph N 52%
9 PM 30° Mostly Clear 16% 7 mph N 54%
10 PM 27° Mostly Clear 16% 7 mph N 58%
11 PM 24° Mostly Clear 16% 7 mph N 60%
12 AM 23° Partly Cloudy 16% 6 mph N 63%
1 AM 22° Partly Cloudy 16% 5 mph N 65%
2 AM 21° Partly Cloudy 3% 5 mph N 66%
3 AM 20° Partly Cloudy 3% 5 mph NNW 68%
4 AM 19° Mostly Clear 3% 5 mph NNW 70%
5 AM 19° Mostly Clear 3% 5 mph NNW 72%
6 AM 18° Mostly Clear 3% 5 mph NNW 72%
7 AM 18° Mostly Clear 3% 5 mph NNW 71%
8 AM 19° Clear 3% 5 mph NNW 69%
9 AM 22° Clear 3% 5 mph NNW 62%
10 AM 23° Clear 3% 5 mph N 55%
11 AM 25° Mostly Clear 3% 5 mph N 48%
12 PM 26° Mostly Clear 3% 6 mph N 45%
1 PM 28° Mostly Clear 3% 6 mph NNW 41%
2 PM 29° Mostly Clear 3% 6 mph NNW 39%
3 PM 30° Mostly Clear 3% 6 mph NNW 40%
4 PM 30° Mostly Clear 3% 6 mph NNW 40%
5 PM 32° Mostly Clear 3% 7 mph NNW 40%
15-Day Forecast
Today
7/15
Mostly Clear
16%
17°
34°
Thu
7/16
Mostly Clear
16%
17°
33°
Fri
7/17
Partly Cloudy
18%
18°
32°
Sat
7/18
Mostly Clear
60%
16°
30°
Sun
7/19
Partly Cloudy
30%
14°
27°
Mon
7/20
Drizzle
60%
14°
30°
Tue
7/21
Partly Cloudy
60%
14°
27°
Wed
7/22
Mostly Clear
9%
13°
26°
Thu
7/23
Drizzle
60%
13°
27°
Fri
7/24
Drizzle
60%
15°
27°
Sat
7/25
Drizzle
60%
16°
28°
Sun
7/26
Drizzle
60%
17°
29°
Mon
7/27
Drizzle
60%
16°
28°
Tue
7/28
Drizzle
60%
16°
28°
Wed
7/29
Drizzle
60%
16°
28°
162
Unhealthy
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Some members of the general public may experience health effects; sensitive groups may experience more serious effects.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
162 AQI 71.5 µg/m³
O3
Ground-level ozone
100 AQI 70 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Thu 162 Unhealthy 100 162
Fri 500 Hazardous 71 500
Sat 451 Hazardous 104 451
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, 20:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 50 60 70 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE3124 J/kg
MLCAPE2544 J/kg
MUCAPE3124 J/kg
SBCIN-36 J/kg
MLCIN0 J/kg
Lifted Index-7.1
Kinematics
0–6 km Shear40 kt
0–1 km Shear6 kt
Eff. Shear44 kt
0–1 km SRH-26
0–3 km SRH-76
Eff. SRH-76
Storm Motion261° @ 28 kt
0–1 km EHI-0.5
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index38.2
Thermo & Levels
PWAT1.80 in
0–3 km LR7.9 °C/km
700–500 LR6.1 °C/km
Total Totals52.1
LCL838 hPa
LFC806 hPa
EL149 hPa
Freezing Lvl15,121 ft