Today | Weather | Friday, November 21, 2025

Weather in Rancho Cucamonga, California

05:27 PM
Now
Rainy Weather
57° F
Feels Like 54°
Precipitation 40 %
Wind 8 mph
Humidity 64 %
Today
Rainy Weather
Day 61°
Night 54°
Precipitation 90 %
Wind 7 mph
UV Index (0 - 11+) 2

Rancho Cucamonga Weather Forecast Updated

21 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 21, 2024)
Night

Day

79°

Night

50°

Wind

4 mph

Precipitation

0 %

Air Quality in Rancho Cucamonga

NOW
40 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.07 µg/m³
PM10 1.82 µg/m³
O3 0.044 ppm
NO2 1.3 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0.03 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)
PM2.51.07 µg/m³
PM101.82 µg/m³
O385.86 µg/m³
NO22.43 µg/m³
SO20.46 µg/m³
CO125.42 µg/m³
NH30.03 µg/m³
NO0 µg/m³