Today | Weather | Saturday, October 24, 2026

Weather in Rancho Cucamonga, California

01:36 PM
Now
Cloudy Weather
75° F
Feels Like 81°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 4
Humidity 33 %
Today
Sunny Weather
Day 79°
Night 54°
Precipitation 0 %
Wind 5 mph
UV Index (0 - 11+) 4

Rancho Cucamonga Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 24, 2025)
Night

Day

82°

Night

54°

Wind

4 mph

Precipitation

0 %

Air Quality in Rancho Cucamonga

NOW
93 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 18.4 µg/m³
PM10 22.57 µg/m³
O3 0.068 ppm
NO2 0.4 ppb
SO2 1 ppb
CO 0.17 ppm
NH3 0.01 µg/m³
NO 0.09 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 18.4 µg/m³
PM10 – 22.57 µg/m³
O3 – 133.05 µg/m³
NO2 – 0.8 µg/m³
SO2 – 2.64 µg/m³
CO – 189.41 µg/m³
NH3 – 0.01 µg/m³
NO – 0.09 µg/m³