Today | Weather | Monday, July 20, 2026
Active Weather Warnings

Weather in St. Joseph, Missouri

04:16 PM
Now
Sunny Weather
99° F
Feels Like 108°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 5
Humidity 43 %
Today
Sunny Weather
Day 99°
Night 75°
Precipitation 1 %
Wind 7 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

St. Joseph Weather Forecast Updated

9 minutes ago
Last updated on

Air Quality in St. Joseph

NOW
34 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.53 µg/m³
PM10 3.04 µg/m³
O3 0.037 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.08 ppm
NH3 0.78 µg/m³
NO 0.1 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)
PM2.52.53 µg/m³
PM103.04 µg/m³
O372.41 µg/m³
NO20.49 µg/m³
SO20.87 µg/m³
CO97.03 µg/m³
NH30.78 µg/m³
NO0.1 µg/m³

Weather Alerts and Warnings for St. Joseph

Moderate Expected Likely

Heat Advisory

Heat Advisory issued July 20 at 2:06AM CDT until July 20 at 9:00PM CDT by NWS Kansas City/Pleasant Hill MO
Jul 20, 1:00 PM Jul 20, 9:00 PM
WHAT: Heat index values up to 107 expected.

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

WHEN: From 1 PM this afternoon to 9 PM CDT this evening.

IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.
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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: Jul 20, 4:07 PM Source: NWS Alert