Today | Weather | Monday, April 6, 2026

Weather in Rancho Cucamonga, California

07:08 AM
Now
Cloudy Weather
61° F
Feels Like 61°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 0
Humidity 55 %
Today
Cloudy Weather
Day 81°
Night 54°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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.

Rancho Cucamonga Weather Forecast Updated

8 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 6, 2025)
Sunny Weather

Day

79°

Night

52°

Wind

7 mph

UV Index

8

Precipitation

1 %

Air Quality in Rancho Cucamonga

NOW
58 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 15.44 µg/m³
PM10 30.36 µg/m³
O3 0.057 ppm
NO2 0.4 ppb
SO2 0.6 ppb
CO 0.13 ppm
NH3 0 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 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)
PM2.515.44 µg/m³
PM1030.36 µg/m³
O3110.99 µg/m³
NO20.66 µg/m³
SO21.53 µg/m³
CO145.16 µg/m³
NH30 µg/m³
NO0 µg/m³