Today | Weather | Wednesday, March 18, 2026

Weather in St. Joseph, Missouri

04:21 AM
Now
Cloudy Night
28° F
Feels Like 28°
Precipitation 20 %
Wind 4 mph
Humidity 83 %
Today
Cloudy Weather
Day 66°
Night 39°
Precipitation 2 %
Wind 5 mph
UV Index (0 - 11+) 5
Overnight Frost 3 AM – 7 AM

St. Joseph Weather Forecast Updated

Last updated on

Air Quality in St. Joseph

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.76 µg/m³
PM10 4.8 µg/m³
O3 0.044 ppm
NO2 1.5 ppb
SO2 0.2 ppb
CO 0.14 ppm
NH3 5.22 µg/m³
NO 0 µg/m³
PM2.5 – 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)
PM2.53.76 µg/m³
PM104.8 µg/m³
O385.59 µg/m³
NO22.84 µg/m³
SO20.49 µg/m³
CO165.18 µg/m³
NH35.22 µg/m³
NO0 µg/m³