Today | Weather | Tuesday, September 1, 2026
Active Weather Warnings

Weather in St. Joseph, Missouri

10:24 AM
Now
Cloudy Weather
84° F
Feels Like 88°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 4
Humidity 57 %
Today
Sunny Weather
Day 99°
Night 75°
Precipitation 1 %
Wind 10 mph
UV Index (0 - 11+) 7

St. Joseph Weather Forecast Updated

23 minutes ago
Last updated on

Air Quality in St. Joseph

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.23 µg/m³
PM10 5.71 µg/m³
O3 0.036 ppm
NO2 1.4 ppb
SO2 0.5 ppb
CO 0.10 ppm
NH3 1.18 µg/m³
NO 0.53 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)
PM2.55.23 µg/m³
PM105.71 µg/m³
O371.32 µg/m³
NO22.65 µg/m³
SO21.22 µg/m³
CO119.08 µg/m³
NH31.18 µg/m³
NO0.53 µg/m³

Weather Alerts and Warnings for St. Joseph

Moderate Expected Likely

Heat Advisory

Heat Advisory issued September 1 at 4:03AM CDT until September 4 at 8:00PM CDT by NWS Kansas City/Pleasant Hill MO
Sep 1, 4:03 AM Sep 4, 8:00 PM
WHAT: Heat index values up to 105.

WHERE: Portions of east central and northeast Kansas and central,
north central, northeast, northwest, and west central Missouri.

WHEN: Until 8 PM CDT Friday.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.

ADDITIONAL DETAILS: While heat index values may not reach 105 each
day, the combination of the longevity of the heat and little or
limited relief during overnight periods have prompted the multi-day
Heat Advisory.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Updated: Sep 1, 10:00 AM Source: NWS Alert