Weather Forecast for St Louis
Missouri, United States of America
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Current Weather - St Louis: 28°C
Current Weather - St Louis: 28°C
Missouri, United States of America
Clear
Feels like 30°C
Wind
13 km/h S
Humidity
58%
Pressure
1012 mb
UV Index
0
Visibility
10 km
Sunny
Friday, September 04, 2026
High
39°C
Low
27°C
Rain Chance
1%
Hourly Forecast
29°C
29°C
31°C
33°C
35°C
37°C
38°C
38°C
39°C
39°C
39°C
38°C
37°C
35°C
34°C
33°C
33°C
Day Statistics
Maximum Wind
16 km/h
Humidity
41%
Precipitation
0 mm
UV Index
8
Visibility
10 km
Rain Chance
1%
Snow Chance
0%
Sun & Moon
Sunrise
06:32 AM
Sunset
07:26 PM
Moonrise
11:35 PM
Moonset
02:30 PM
Moon Phase
Last Quarter
Moon Illumination
39%
Air Quality
PM2.5
9.6
μg/m³
PM10
10.7
μg/m³
NO₂
12.7
μg/m³
O₃
93.7
μg/m³
SO₂
3.3
μg/m³
CO
141.3
μg/m³
Weather Alerts
Extreme Heat Warning issued September 3 at 2:45PM CDT until September 5 at 8:00PM CDT by NWS St Louis MO
* WHAT...Dangerously hot conditions with heat index values up to 108. * WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.
People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668.
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