Today | Weather | Wednesday, March 18, 2026

Weather in Caldwell, Idaho

03:47 AM
Now
Cloudy Night
39° F
Feels Like 37°
Precipitation 0 %
Wind 6 mph
Humidity 81 %
Today
Cloudy Weather
Day 79°
Night 39°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 5

Caldwell Weather Forecast Updated

24 minutes ago
Last updated on

Air Quality in Caldwell

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.6 µg/m³
PM10 1.7 µg/m³
O3 0.026 ppm
NO2 0.6 ppb
SO2 0 ppb
CO 0.09 ppm
NH3 6.98 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)
PM2.50.6 µg/m³
PM101.7 µg/m³
O351.85 µg/m³
NO21.1 µg/m³
SO20 µg/m³
CO99.9 µg/m³
NH36.98 µg/m³
NO0 µg/m³