Today | Weather | Monday, September 21, 2026

Weather in Caldwell, Idaho

11:54 AM
Now
Cloudy Weather
75° F
Feels Like 79°
Precipitation 0 %
Wind 8 mph
UV Index (0 - 11+) 4
Humidity 37 %
Today
Sunny Weather
Day 86°
Night 52°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 5

Caldwell Weather Forecast Updated

36 minutes ago
Last updated on

Air Quality in Caldwell

NOW
26 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.92 µg/m³
PM10 4.39 µg/m³
O3 0.029 ppm
NO2 0.7 ppb
SO2 0 ppb
CO 0.11 ppm
NH3 1.58 µg/m³
NO 0.56 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)
PM2.51.92 µg/m³
PM104.39 µg/m³
O356.16 µg/m³
NO21.37 µg/m³
SO20.01 µg/m³
CO121.56 µg/m³
NH31.58 µg/m³
NO0.56 µg/m³