Today | Weather | Wednesday, May 20, 2026

Weather in Waterloo, Iowa

04:51 PM
Now
Cloudy Weather
61° F
Feels Like 63°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 3
Humidity 43 %
Today
Cloudy Weather
Day 63°
Night 48°
Precipitation 1 %
Wind 8 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.

Waterloo Weather Forecast Updated

Last updated on

Air Quality in Waterloo

NOW
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.26 µg/m³
PM10 1.38 µg/m³
O3 0.046 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.10 ppm
NH3 2.48 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)
PM2.51.26 µg/m³
PM101.38 µg/m³
O390.11 µg/m³
NO20.46 µg/m³
SO20.17 µg/m³
CO117.8 µg/m³
NH32.48 µg/m³
NO0.1 µg/m³