Air quality index63Moderate

Acceptable for most people; unusually sensitive people should take it easier outdoors.

Next 24 hours

US AQI

71Now
63
55
4711 PM
44
42
392 AM
39
38
375 AM
37
36
358 AM
37
38
3911 AM
46
54
612 PM
68
75
825 PM
74
65

Air quality outlook

Worst hour each day

Today94Moderate
Thu 882Moderate
Fri 9126Unhealthy for sensitive groups
Sat 1086Moderate
Sun 1163Moderate

From our air-quality forecast models (GEOS-CF / GEFS aerosols). AQI uses the US EPA scale.

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About St. Louis weather

St. Louis is in City of Saint Louis, Missouri, United States at 38.63°, -90.20°. Right now it’s 68° and clear; today’s high is 87° with a 0% chance of rain.

Missouri has a humid continental climate in the north and a humid subtropical climate in the south, placing it at the convergence of multiple weather influences. The state's central location means it receives weather from every direction — Arctic cold from Canada, Gulf moisture from the south, and dry air from the west. This produces highly variable weather and the common saying among Missourians to wait five minutes if you don't like the weather.