Today | Weather | Wednesday, May 20, 2026

Weather in Caldwell, Idaho

03:52 PM
Now
Cloudy Weather
75° F
Feels Like 79°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 5
Humidity 25 %
Today
Cloudy Weather
Day 77°
Night 48°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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.

Caldwell Weather Forecast Updated

2 minutes ago
Last updated on

Air Quality in Caldwell

NOW
44 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 0.64 µg/m³
PM10 1.54 µg/m³
O3 0.047 ppm
NO2 0.1 ppb
SO2 0 ppb
CO 0.09 ppm
NH3 1.59 µg/m³
NO 0.04 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)
PM2.50.64 µg/m³
PM101.54 µg/m³
O392.74 µg/m³
NO20.14 µg/m³
SO20.03 µg/m³
CO101.5 µg/m³
NH31.59 µg/m³
NO0.04 µg/m³