Today | Weather | Thursday, October 30, 2025

Weather in St. Louis, Missouri

01:34 PM

Now

57° F

Feels Like 55°

Precipitation 0 %

Wind 10 mph

UV Index (0 - 11+) 3

Humidity 55 %

Today

Day 57°

Night 41°

Precipitation 0 %

Wind 9 mph

UV Index (0 - 11+) 3

St. Louis Weather Forecast Updated

18 minutes ago

Last updated on October 30, 2025 1:15 PM

Weather Forecast History

Last Year's Weather on This Day (October 30, 2024)

Day

82°

Night

64°

Wind

14 mph

Precipitation

Air Quality in St. Louis

NOW

35 AQI

Good air quality Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 4.16 µg/m³

PM₁₀ 4.61 µg/m³

O₃ 0.038 ppm

NO₂ 0.5 ppb

SO₂ 0.6 ppb

CO 0.11 ppm

NH₃ 0.53 µg/m³

NO 0.28 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 4.16 µg/m³

PM₁₀ – 4.61 µg/m³

O₃ – 74.97 µg/m³

NO₂ – 0.98 µg/m³

SO₂ – 1.49 µg/m³

CO – 125.43 µg/m³

NH₃ – 0.53 µg/m³

NO – 0.28 µg/m³

View Hourly Air Quality Forecast