Weather Forecast for St Louis

Missouri, United States of America

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Partly cloudy

Current Weather - St Louis: 23°C

Missouri, United States of America

Partly cloudy

Feels like 26°C

Wind

10 km/h S

Humidity

87%

Pressure

1017 mb

UV Index

3

Visibility

16 km

Sunny

Sunny

Saturday, July 25, 2026

High

35°C

Low

21°C

Rain Chance

75%

Hourly Forecast

Sunny 35°C
17:00
Sunny 33°C
18:00
Patchy rain nearby 31°C
19:00
Partly Cloudy 28°C
20:00
Clear 27°C
21:00
Clear 26°C
22:00
Clear 26°C
23:00
Jul 26

Day Statistics

Maximum Wind

13 km/h

Humidity

82%

Precipitation

10 mm

UV Index

9

Visibility

10 km

Rain Chance

75%

Snow Chance

0%

Sun & Moon

Sunrise

05:56 AM

Sunset

08:18 PM

Moonrise

06:11 PM

Moonset

02:15 AM

Moon Phase

Waxing Gibbous

Moon Illumination

90%

Air Quality

PM2.5

11.2

μg/m³

PM10

11.6

μg/m³

NO₂

12.8

μg/m³

O₃

93.6

μg/m³

SO₂

3.9

μg/m³

CO

167.1

μg/m³

US EPA Index: 1 GB DEFRA Index: 1

Solar Radiation Data

Shortwave Radiation

101.28

Diffuse Radiation

57.38

DNI

0

GTI

0

Weather Alerts

Flood Advisory issued July 25 at 6:09AM CDT until July 25 at 9:15AM CDT by NWS St Louis MO

Madison, IL Jul 25, 06:09 AM - Jul 25, 09:15 AM
Severity: Minor Urgency: Expected

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Northwestern Madison County in southwestern Illinois... * WHEN...Until 915 AM CDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 609 AM CDT, Doppler radar indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. Between 2 and 3 inches of rain have fallen. - Some locations that will experience flooding include... Alton, Godfrey, Wood River, Bethalto, East Alton, South Roxana, Roxana, Hartford, Rosewood Heights, Dorsey and Fosterburg.

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

Event: Flood Advisory Certainty: Likely Category: Met

Heat Advisory issued July 24 at 12:15PM CDT until July 27 at 9:00PM CDT by NWS St Louis MO

Greene; Macoupin; Montgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Adams; Brown; Pike; Calhoun; Jersey; Madison; St. Clair; Monroe; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; St. Charles; Franklin; St. Louis; St. Louis City; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds Jul 24, 12:15 PM - Jul 25, 06:15 AM
Severity: Moderate Urgency: Expected

* WHAT...Heat index values up to 111 expected. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...From 11 AM Sunday to 9 PM CDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. 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.

Event: Heat Advisory Certainty: Likely Category: Met

Heat Advisory issued July 25 at 1:28AM CDT until July 27 at 9:00PM CDT by NWS St Louis MO

Greene; Macoupin; Montgomery; Bond; Fayette; Clinton; Marion; Washington; Randolph; Adams; Brown; Pike; Calhoun; Jersey; Madison; St. Clair; Monroe; Knox; Lewis; Shelby; Marion; Monroe; Ralls; Pike; Audrain; Osage; Callaway; Montgomery; Lincoln; Gasconade; Warren; St. Charles; Franklin; St. Louis; St. Louis City; Jefferson; Crawford; Washington; St. Francois; Ste. Genevieve; Iron; Madison; Reynolds Jul 25, 01:28 AM - Jul 25, 04:30 PM
Severity: Moderate Urgency: Expected

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...From 11 AM Sunday to 9 PM CDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. 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.

Event: Heat Advisory Certainty: Likely Category: Met