Today | Weather | Saturday, May 16, 2026

Weather in Rialto, California

12:37 PM
Now
Cloudy Weather
70° F
Feels Like 72°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 3
Humidity 52 %
Today
Cloudy Weather
Day 73°
Night 55°
Precipitation 4 %
Wind 9 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Rialto Weather Forecast Updated

32 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 16, 2025)
Cloudy Weather

Day

79°

Night

54°

Wind

7 mph

UV Index

11

Precipitation

1 %

Air Quality in Rialto

NOW
44 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.68 µg/m³
PM10 17.61 µg/m³
O3 0.047 ppm
NO2 0.1 ppb
SO2 0.2 ppb
CO 0.10 ppm
NH3 0.02 µg/m³
NO 0.06 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)
PM2.55.68 µg/m³
PM1017.61 µg/m³
O392.94 µg/m³
NO20.27 µg/m³
SO20.62 µg/m³
CO119.21 µg/m³
NH30.02 µg/m³
NO0.06 µg/m³