Today | Weather | Wednesday, March 18, 2026

Weather in St. Joseph, Missouri

05:21 AM
Now
Cloudy Night
28° F
Feels Like 28°
Precipitation 20 %
Wind 4 mph
Humidity 91 %
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

45 minutes ago
Last updated on

Air Quality in St. Joseph

NOW
37 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.65 µg/m³
PM10 4.71 µg/m³
O3 0.040 ppm
NO2 1.5 ppb
SO2 0.1 ppb
CO 0.15 ppm
NH3 5.45 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)
PM2.53.65 µg/m³
PM104.71 µg/m³
O379.16 µg/m³
NO22.91 µg/m³
SO20.36 µg/m³
CO166.17 µg/m³
NH35.45 µg/m³
NO0 µg/m³